Resin composition, fiber-reinforced resin composition, and molded article

Abstract

The present invention provides a resin composition containing an aromatic polyether resin with improved electrical properties and a nanocarbon material. [Solution] The radical amount at 25°C was measured using TEMPOL as the standard substance and benzene as the solvent for the standard substance, and was 6.5 × 10 15 A resin composition comprising an aromatic polyether with a spin / g or higher and a nanocarbon material.

Description

[Technical Field]

[0001] The present invention relates to resin compositions. More specifically, the present invention relates to resin compositions, fiber-reinforced resin compositions, and molded articles comprising aromatic polyethers and nanocarbon materials. [Background technology]

[0002] Aromatic polyethers such as polyether ether ketone (PEEK) possess excellent heat resistance and mechanical strength, and due to these characteristics, they are used as metal substitute materials. To improve the electrical properties, thermal properties, and mechanical strength of aromatic polyethers, nanocarbon materials such as nanodiamond carbon, carbon nanotubes, and carbon nanofibers are incorporated. For example, it has been reported that adding nanodiamond particles to aromatic polyethers can improve their thermal stability (Patent Documents 1 and 2). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] International Publication No. 2017 / 038333 [Patent Document 2] International Publication No. 2018 / 079597 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] In recent years, materials with excellent electrical properties, such as conductivity and antistatic properties, have been developed and are used in semiconductor applications and as components for precision equipment. However, there has been a challenge in that the improvement in electrical properties is insufficient due to the difficulty in highly dispersing nanocarbon materials in aromatic polyether resins. One of the objectives of the present invention is to improve the electrical properties of a resin composition containing an aromatic polyether resin and a nanocarbon material. [Means for solving the problem]

[0005] As a result of intensive studies, the present inventors have found that the addition effect of the nanocarbon material is remarkably improved by using an aromatic polyether having a specific radical amount, and have completed the present invention.

[0006] According to the present invention, the following resin compositions and the like can be provided. 1. A resin composition comprising an aromatic polyether having a radical amount of 6.5×10 15 spin / g or more at 25°C, measured with TEMPOL as the standard substance and benzene as the solvent of the standard substance, and a nanocarbon material. 2. The resin composition according to 1, wherein the mass ratio (the aromatic polyether / the nanocarbon material) is 99.9 / 0.1 to 90 / 10. 3. The resin composition according to 1 or 2, wherein the aromatic polyether contains at least one selected from the group consisting of polyether ether ketone (PEEK), polyether ketone ketone (PEKK), and polyether ketone (PEK). 4. The resin composition according to any one of 1 to 3, wherein the nanocarbon material contains at least one selected from the group consisting of diamond nanocarbon, carbon nanotube, and carbon nanofiber. 5. A fiber reinforced resin composition comprising the resin composition according to any one of 1 to 4 and a reinforcing fiber. 6. The fiber reinforced resin composition according to 5, wherein the reinforcing fiber contains at least one selected from the group consisting of glass fiber, carbon fiber, and aramid fiber. 7. A molded body formed by molding at least one selected from the group consisting of the resin composition according to any one of 1 to 4 and the fiber reinforced resin composition according to 5 or 6.

Advantages of the Invention

[0007] According to the present invention, the electrical properties of an aromatic polyether resin composition containing a nanocarbon material can be improved.

Embodiments for Carrying Out the Invention

[0008] Hereinafter, the resin composition, fiber reinforced resin composition, and molded body of the present invention will be described in detail. In addition, in this specification, "x to y" shall represent a numerical range of "x or more and y or less". The upper and lower limit values described for the numerical range can be arbitrarily combined. Moreover, among the individual embodiments of the aspects according to the present invention described below, those that are not mutually contradictory can be combined in two or more, and an embodiment combining two or more embodiments is also an embodiment of the aspect according to the present invention.

[0009] 1. Resin composition The resin composition according to one aspect of the present invention contains an aromatic polyether having a radical amount of 6.5×10 15 spin / g or more at 25°C, measured with TEMPOL as the standard substance and benzene as the solvent of the standard substance, and a nano carbon material.

[0010] In this aspect, by using an aromatic polyether having a specific radical amount in the resin composition, the addition effect of the nano carbon material is significantly improved. The reason for the improved addition effect is presumed to be that the abundant radicals contained in the aromatic polyether and the surface of the nano carbon material can interact with each other or form chemical bonds. Hereinafter, the constituent components of the resin composition of this aspect will be described.

[0011] [Aromatic polyether] The radical amount of the aromatic polyether used in the resin composition of this aspect is 6.5×10 15 spin / g or more. The lower limit of the radical amount of the aromatic polyether is 7.0×10 15 spin / g or more, 20×10 15 (2.0×10 16 )spin / g or more, 30×10 15 (3.0×10 16 )spin / g or more, 40×10 15 (4.0×10 16 )spin / g or more, or 50×10 15(5.0 × 10 16 ) spin / g or more is also acceptable. The upper limit for the amount of radicals in aromatic polyethers is 9.0 × 10⁻⁶. 17 spin / g or less, 5.0×10 17 spin / g or less, or 1.0 × 10 17 It may be less than spin / g.

[0012] In one embodiment, the amount of radicals in the aromatic polyether is 6.5 × 10⁻⁶. 15 spin / g or more 9.0×10 17 spin / g or less, 7.0×10 15 spin / g or more 9.0×10 17 spin / g or less, 20×10 15 spin / g or more 5.0×10 17 spin / g or less, 30×10 15 spin / g or more 5.0×10 17 spin / g or less, 40×10 15 spin / g or more 1.0×10 17 spin / g or less, or 50 × 10 15 spin / g or more 1.0×10 17 It is less than spin / g.

[0013] The amount of radicals in aromatic polyethers is 6.5 × 10 15 When the spin / g value is above this, the aforementioned improvement in electrical properties can be obtained. On the other hand, the amount of radicals in aromatic polyethers is 9.0 × 10 17 When the spin / g value is below a certain level, sufficient thermal stability can be obtained, and the molded product is likely to exhibit sufficient mechanical properties.

[0014] The amount of radicals in aromatic polyethers can be increased to the range described above, for example, by using monomers containing chlorine atoms as reactive groups (e.g., 4,4'-dichlorobenzophenone, etc.) when synthesizing (polymerizing) aromatic polyethers. The amount of radicals in the aromatic polyether is the value measured by the method described in the examples.

[0015] In one embodiment, the aromatic polyether is a polyarylene ether ketone. For example, the aromatic polyether includes one or more selected from the group consisting of polyether ether ketone (PEEK), polyether ketone ketone (PEKK), and polyether ketone (PEK). Among these, PEEK is preferred from the viewpoint of moldability and thermal stability.

[0016] In one embodiment, 50% or more by mass of the aromatic polyether is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is one or more selected from the group consisting of PEEK, PEKK, and PEK. In one embodiment, 50% or more by mass of the aromatic polyether is PEEK, or 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass.

[0017] In one embodiment, the aromatic polyether comprises a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2). [ka]

[0018] In one embodiment, the aromatic polyether includes a structural unit represented by the following formula (3). [ka]

[0019] The structural unit represented by equation (3) is a combination of the structural unit represented by equation (1) and the structural unit represented by equation (2).

[0020] In one embodiment, the aromatic polyether does not contain any structures other than the structural units represented by formulas (1) and (2). However, as is obvious from the definition, it may also contain the structural unit represented by formula (3).

[0021] In one embodiment, the aromatic polyether includes other structures other than the structural units represented by formulas (1) and (2), to the extent that the effects of the present invention are not impaired.

[0022] In one embodiment, 50% or more by mass of the aromatic polyether is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass.

[0023] In one embodiment, in an aromatic polyether, the molar ratio of structural units represented by formula (1) to structural units represented by formula (2) (structural units represented by formula (1):structural units represented by formula (2)) is 47.5:52.5~52.5:47.5, 48.0:52.0~52.0:48.0, 48.5:51.5~51.5:48.5, 49.0:51.0~51.0:49.0, or 49.5:50.5~50.5:49.5. The number of moles of the structural unit represented by equation (1) may be greater than, less than, or the same as the number of moles of the structural unit represented by equation (2).

[0024] In one embodiment, the aromatic polyether comprises a structural unit represented by the following formula (a) and one or more structural units selected from the group consisting of structures represented by the following formulas (b) and (c). [ka]

[0025] In one embodiment, an aromatic polyether can also be defined as a copolymer of a structural unit represented by formula (a) and one or more structural units selected from the group consisting of formulas (b) and (c).

[0026] In one embodiment, the copolymer is a random copolymer, an alternating copolymer, or a block copolymer, and is preferably a random copolymer.

[0027] In aromatic polyethers, the substitution position (bonding position) of the phenyl group in the structural unit represented by formula (b) can be any position on the benzene ring constituting the main chain, as shown on the far right of formula (b) (the phenyl group is introduced to substitute for any of the four hydrogen atoms on the benzene ring).

[0028] In aromatic polyethers, the substitution position (bonding position) of the cyano group in the structural unit represented by formula (c) can be any position on the benzene ring constituting the main chain, as shown on the leftmost side of formula (c). One of the five carbon atoms that can be bonded on the benzene ring forms a single bond with an adjacent structural unit, and one of the remaining four carbon atoms is bonded to the cyano group.

[0029] In an aromatic polyether, if there are two or more adjacent structural units represented by formula (b), the aromatic polyether may contain one or more structures selected from the group consisting of the structure represented by (b1), the structure represented by (b2), and the structure represented by (b3). [ka]

[0030] Each of the structures represented by formulas (b1) to (b3) above has different substitution positions of the phenyl group in the two structural units represented by formula (b) that form the structure. The effects of the present invention are well exhibited regardless of which of these structures is included.

[0031] Here, we have described the case where two or more structural units represented by formula (b) are adjacent to each other. However, even when two or more structural units represented by formula (b) are arranged via other structural units (for example, structural units represented by formula (a)), the substitution positions of the phenyl groups in these structural units represented by formula (b) may be the same or different. In either case, the effects of the present invention are well exhibited.

[0032] In one embodiment, 50% or more by mass of the aromatic polyether is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is the structural unit represented by formula (a) and the structural unit represented by formula (b). Furthermore, in the case of "substantially 100% by mass," it is acceptable for unavoidable impurities to be present.

[0033] In one embodiment, 50% or more by mass of the aromatic polyether is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is the structural unit represented by formula (a) and the structural unit represented by formula (c). Furthermore, in the case of "substantially 100% by mass," it is acceptable for unavoidable impurities to be present.

[0034] The ratio of the structural unit represented by formula (a) to one or more structural units selected from the group consisting of formulas (b) and (c) is not particularly limited and can be appropriately selected within a range that does not impair the effects of the present invention.

[0035] The terminal structure of the main chain of aromatic polyethers is not particularly limited. In one embodiment, a structural unit represented by formula (1) is arranged at one or more ends of the main chain of an aromatic polyether. In this case, the end structure bonded to the structural unit may be a halogen atom. The halogen atom may be, for example, a chlorine atom (Cl) or a fluorine atom (F). In one embodiment, a structural unit represented by formula (2) is arranged at one or more ends of the main chain of an aromatic polyether. In this case, the terminal structure bonded to the structural unit may be, for example, a hydrogen atom (H) (when the terminal structure is a hydrogen atom (H), a hydroxyl group is formed together with the oxygen atom (O) in the structural unit). The terminal structure of the aromatic polyether may be, for example, a structure in which the halogen atoms or hydroxyl groups mentioned above are replaced by hydrogen atoms (H), etc. Furthermore, the terminal structure may have structures other than those exemplified above.

[0036] The weight-average molecular weight (Mw) of aromatic polyethers is not particularly limited. In one embodiment, the weight-average molecular weight (Mw) of the aromatic polyether is 40,000 or more, 50,000 or more, or 55,000 or more, and also 150,000 or less, 140,000 or less, or 135,000 or less. Furthermore, the weight-average molecular weight (Mw) of the aromatic polyether is, for example, 40,000 to 150,000. From the viewpoint of moldability, it is preferably 50,000 to 140,000, and from the viewpoint of mechanical properties, it is more preferably 55,000 to 135,000. The weight-average molecular weight (Mw) of the aromatic polyether is the value measured by the method described in the examples.

[0037] [Nanocarbon materials] Examples of nanocarbon materials include nanodiamonds, carbon nanotubes, carbon nanofibers, graphene, and fullerenes. Among these, nanodiamonds, carbon nanotubes, and carbon nanofibers are preferred from the viewpoint of mechanical properties, heat resistance, and moldability. The nanocarbon material may be used alone or in combination of two or more types. In one embodiment, the nanocarbon material comprises substantially only one or more selected from the group consisting of nanodiamond, carbon nanotube, carbon nanofiber, graphene, and fullerene. In another embodiment, the nanocarbon material is used alone.

[0038] In one embodiment, the mass ratio ((A) / (B)) of aromatic polyether (A) to nanocarbon material (B) is 99.9 / 0.1 to 90 / 10. In this embodiment, even with a small amount of nanocarbon material added, the electrical properties can be efficiently improved. In one embodiment, the mass ratio ((A) / (B)) is preferably 99.9 / 0.1 to 95 / 5. This allows for more efficient improvement of the electrical properties. In one embodiment, the mass ratio ((A) / (B)) is 99.9 / 0.1 to 99 / 1.

[0039] Regarding electrical properties, for example, if the volume resistivity of the resin composition is 5 × 10⁻⁶ 18 Ω m or less, 5×10 17 Ω m or less or 6×10 16 It can be reduced to Ω·m or less. The volume resistivity of the resin composition is measured by the method described in the examples.

[0040] The resin composition may also contain other components besides aromatic polyethers and nanocarbon materials, as long as they do not impair the effects of the present invention. Other components include, for example, resins other than aromatic polyethers. Furthermore, it may contain known resin additives such as antioxidants. Other ingredients may be used individually or in combination of two or more.

[0041] In one embodiment, 50% or more by mass of the resin composition is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is an aromatic polyether and a nanocarbon material. Furthermore, in the case of "substantially 100% by mass," it is acceptable for unavoidable impurities to be present.

[0042] The method for producing the resin composition of this embodiment is not particularly limited, and known means can be applied. For example, it can be produced by mixing the aromatic polyether and nanocarbon material with optional components in a predetermined ratio, and then melt-kneading them. Known equipment such as an extruder can be used for melt-kneading.

[0043] 2. Fiber-reinforced resin composition A fiber-reinforced resin composition according to one aspect of the present invention comprises the resin composition according to one aspect of the present invention described above, and 1 to 300 parts by mass of reinforcing fibers per 100 parts by mass of the resin composition. According to the fiber-reinforced resin composition according to this aspect, excellent interfacial shear strength between the resin composition and the reinforcing fibers is obtained, resulting in excellent mechanical strength (e.g., tensile strength) as a fiber-reinforced resin composition. The reason for obtaining such an effect is not entirely clear, but it is presumed that a new structure having an adhesive effect on the reinforcing fibers is formed due to the effect of high-concentration radicals of aromatic polyether.

[0044] In one embodiment, the content of reinforcing fibers in the fiber-reinforced resin composition is 2 parts by mass or more, 5 parts by mass or more, or 10 parts by mass or more, and also 250 parts by mass or less, 200 parts by mass or less, 150 parts by mass or less, or 100 parts by mass or less, per 100 parts by mass of the resin composition.

[0045] In one embodiment, the content of reinforcing fibers in the fiber-reinforced resin composition is 2 parts by mass or more and 250 parts by mass or less, 2 parts by mass or more and 200 parts by mass or less, 5 parts by mass or more and 150 parts by mass or less, or 10 parts by mass or more and 100 parts by mass or less, per 100 parts by mass of the resin composition.

[0046] In one embodiment, the reinforcing fiber includes one or more selected from the group consisting of glass fiber, carbon fiber, and aramid fiber. In one embodiment, 50% or more by mass of the reinforcing fibers is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is one or more selected from the group consisting of glass fibers, carbon fibers, and aramid fibers.

[0047] In one embodiment, the carbon fiber includes one or more selected from the group consisting of PAN-based carbon fiber, pitch-based carbon fiber, thermosetting carbon fiber, phenol-based carbon fiber, vapor-grown carbon fiber, and recycled carbon fiber (RCF). In one embodiment, 50% or more by mass of the carbon fiber is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is one or more selected from the group consisting of PAN-based carbon fiber, pitch-based carbon fiber, thermosetting carbon fiber, phenol-based carbon fiber, vapor-grown carbon fiber, and recycled carbon fiber (RCF).

[0048] The types of glass fibers and aramid fibers are not particularly limited. As glass fibers, for example, glass fibers of various compositions such as E-glass, low-dielectric glass, and silica glass can be selected and used according to the purpose and application.

[0049] In one embodiment, from the viewpoint of mechanical properties such as strength, elastic modulus, and impact resistance of the molded product, the average fiber length of the reinforcing fibers is 5 mm or more. The average fiber length is calculated by the arithmetic mean of the values ​​measured with calipers.

[0050] In one embodiment, 50% or more by mass of the fiber-reinforced resin composition is 60% or more by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 95% or more by mass, 97% or more by mass, 99% or more by mass, 99.5% or more by mass, or substantially 100% by mass is the resin composition and reinforcing fibers.

[0051] The method for producing (compounding) the fiber-reinforced resin composition is not particularly limited. For example, a method of melt-kneading the resin composition and reinforcing fibers, or a method of melting and impregnating a reinforcing fiber aggregate with a resin composition in powder, film, or pellet form can be used. The fiber-reinforced resin composition containing continuous fibers with an average fiber length of 5 mm or more may be in one or more forms selected from the group consisting of, for example, woven fabrics, nonwoven fabrics, and unidirectional materials (also referred to as "UD materials").

[0052] Pellet forms of the composite material may be manufactured. These pellets can be used as raw materials for manufacturing molded articles, as described later.

[0053] In one embodiment, the method for producing pellets includes cutting reinforcing fibers into chopped strands, and then adding an aromatic polyether or resin composition to the reinforcing fibers. Pellets (also referred to as "short fiber pellets") can be produced by mixing the short fibers with the aromatic polyether or resin composition and granulating them.

[0054] In one embodiment, the pellet manufacturing method involves immersing reinforcing fiber rovings in molten aromatic polyether or resin composition, drawing them, and then cutting them to the desired pellet length to produce pellets (also referred to as "long fiber pellets"). When long fiber pellets are manufactured in this manner, breakage of the reinforcing fibers can be suppressed.

[0055] 3. Molded body A molded article according to one aspect of the present invention is made of a resin composition according to one aspect of the present invention. The molded article according to this aspect has excellent heat resistance.

[0056] A molded article according to another aspect of the present invention is made of a fiber-reinforced resin composition according to one aspect of the present invention. According to the molded article of this aspect, the interfacial shear strength between the resin composition and the reinforcing fibers in the fiber-reinforced resin composition is excellent, and therefore excellent mechanical strength (e.g., tensile strength) is obtained.

[0057] The form of the molded article according to one aspect of the present invention and other aspects is not particularly limited. In one embodiment, the molded body is an injection-molded body, an extruded body, or a compression-molded body.

[0058] The applications of the resin compositions, fiber-reinforced resin compositions, and molded articles described above are not particularly limited and can be broadly applied to various applications where strength is required. The resin compositions and fiber-reinforced resin compositions are particularly suitable as metal substitutes for applications requiring heat resistance, solvent resistance, and durability. More specifically, they can be suitably used in aerospace components, automotive components, sliding components such as gears and bearings, 3D printer filaments, semiconductor manufacturing equipment components, and the like. [Examples]

[0059] The following describes embodiments of the present invention, but the present invention is not limited to these embodiments.

[0060] Manufacturing Example 1 1. Production of aromatic polyethers Nitrogen gas was circulated through a 240L reaction vessel equipped with a stirrer, thermometer, nitrogen inlet tube, and water recovery container connected to a cooling tube. 132.47 kg of diphenyl sulfone (manufactured by Sino-High) was added in stages, and the temperature was raised to 160°C. After confirming melting, 39.00 kg (155 mol) of 4,4'-dichlorobenzophenone (manufactured by Sino-High), 16.85 kg (153 mol) of hydroquinone, and 21.78 kg (158 mol) of potassium carbonate (AGC Inc., fine powder) were added in order. The reaction concentration was 2.31 mol / kg. Here, the "reaction concentration" is defined by the following formula, based on the number of moles [mol] of OH groups calculated from the total amount (amount added) of phenolic monomers (hydroquinones) used in the reaction (added to the reaction mixture). Reaction concentration [mol / kg] = number of moles of OH groups [mol] / mass of solvent [kg]

[0061] The reaction mixture was carried out under the following temperature control, and then 6.15 kg (25 mol) of 4,4'-dichlorobenzophenone was added as a reaction stopper.

[0062] <Temperature control> (1) Heat from 160°C to 200°C over 90 minutes at a stirring speed of 100 rpm. (2) Hold at 200°C for 60 minutes (3) Increase the temperature from 200°C to 250°C over 80 minutes. (4) Hold at 250°C for 60 minutes (5) Increase the temperature from 250°C to 300°C over 150 minutes. (6) Hold at 300°C for 263 minutes (7) Add the reaction stopper and maintain the temperature at 300°C. Terminate the reaction when the solution viscosity reaches 195 cp.

[0063] After the reaction was complete, the contents were removed into a SUS tray and cooled to room temperature to solidify. The product was coarsely ground, then ground again with a pin mill (Hosokawa Micron Corporation 160UPZ), washed in the order of acetone, oxalic acid aqueous solution, and water, and vacuum dried to obtain a powdered aromatic polyether.

[0064] 2. Evaluation of aromatic polyethers The weight-average molecular weight (Mw) of the obtained aromatic polyethers was measured by GPC (gel permeation chromatography) under the following conditions and procedure. The results are shown in Table 1.

[0065] [GPC measurement conditions] • GPC device: HLC-8420GPC (manufactured by Tosoh Corporation) GPC column: Use TSK gel guardcolumn HH (4.6mm I.D. x 35mm) and two TSK gel Super HM-M (6mm I.D. x 150mm) in this order in series. • Solvent: PFP / CHCl3 mixed solvent ·Temperature: 40℃ ·Flow rate: 0.6mL / min ·Injection amount: 20μL • Calibration curve: Calibration according to PS standard

[0066] [procedure] Aromatic polyether resin compositions were dissolved in pentafluorophenol (PFP), and the GPC distribution was measured under the above measurement conditions. The weight-average molecular weight (Mw) was calculated from the obtained GPC distribution using a calibration curve with a polystyrene (PS) standard.

[0067] Manufacturing Example 2 The weight-average molecular weight (Mw) of a commercially available aromatic polyether (PEEK, Solvay, KT-880FP) was evaluated in the same manner as in Production Example 1. The results are shown in Table 1.

[0068] [Table 1]

[0069] Example 1 1. Manufacturing of resin compositions To 100 parts by mass of aromatic polyether obtained in Production Example 1, water was added in a ratio of 100 parts by mass. Then, 0.25 parts by mass of inorganic metal phosphate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., with a mass ratio of "Na2HPO4" to "NaH2PO4" of 2:3) was added and mixed at 25°C for 30 minutes. After mixing, the resulting mixture was dried at 140°C for 24 hours. Then, 100 parts by mass of the dried mixture, 0.25 parts by mass of a nucleating agent (manufactured by ADEKA Corporation, "NA-21"), and 0.5 parts by mass of nanodiamond carbon (manufactured by NEOMOND, "NPC-H1") were dry-blended to obtain a blended raw material. This blended raw material was melt-kneaded using a Thermo Fisher Scientific "Process-11" with a cylinder diameter of 11 mm, at a screw rotation speed of 250 rpm and a set temperature of 380°C. Here, the dry blend raw material was supplied at a rate of 6 g / min from the base of the twin-screw extruder (upstream side of the screw). The residence time in the twin-screw extruder was 3.5 minutes. After cooling the strands discharged from the twin-screw extruder in water, they were pelletized using a pelletizer to obtain the resin composition.

[0070] 2. Preparation of test specimens for volume resistivity measurement The resin composition pellets obtained in step 1 above were vacuum-press molded at 380°C to produce a 110 × 110 × 0.5 (mm) flat plate, which was then cut into 50 × 50 × 0.5 (mm) test pieces.

[0071] 3. Evaluation The amount of radicals in the aromatic polyethers synthesized in the manufacturing example was evaluated. Furthermore, the volume resistivity (Ω·m) of the aromatic polyether resin compositions (test specimens) of the examples and comparative examples was evaluated. The measurement conditions are shown below. The evaluation results of the aromatic polyether resin compositions are shown in Table 2.

[0072] (1) Measurement of radical quantity The radical concentration of the target substance (radical concentration at 25°C, measured using TEMPOL as the standard substance and benzene as the solvent for the standard substance) was measured by ESR (electron spin resonance) under the following conditions and procedure.

[0073] [ESR measurement conditions] • ESR device: JESFA200 model manufactured by JEOL Ltd. ·ESR sample tube diameter: 5mm • Microwave output: 0.5mW Modulated magnetic field: 0.3mT ·Time constant: 0.03 seconds • Magnetic field range: 328~344mT • Measurement time: 60 seconds ·Mn strength: 650 ·Measurement temperature: 25℃

[0074] [procedure] TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl) was dissolved in benzene at a concentration of 5 μM, and 400 μL was added to an ESR sample tube. The ESR was measured under the above measurement conditions. The integral value of the peak derived from TEMPOL was divided by the integral value of the peak derived from Mn and normalized (integral value A). Subsequently, the sample was weighed (weighed value B), filled into an ESR sample tube, and the ESR was measured under the above measurement conditions. The integral value of the peak derived from the sample was divided by the integral value of the peak derived from Mn and normalized (integral value C). Using the obtained values ​​A, B, and C, the amount of radicals per unit mass of the sample (radical concentration) was calculated using the following formula. Radical concentration [spin / g] = (5 × 10 -6 ×400×10 -6 ×6.02×10 23 ×C) / (A×B)

[0075] The amount of radicals in the aromatic polyether from manufacturing example 1 is 8.7 × 10⁻⁶. 16 spin / g, the radical amount of the aromatic polyether in manufacturing example 2 is 3.0 × 10⁻⁶. 15 The spin / g was

[0076] (2) Measurement of volume resistivity The volume resistivity of the test specimens was measured using the following equipment. ·Body: Super insulation meter (HIOKI SME-8310) • Electrodes: Main electrode diameter 50mm, guard electrode inner diameter 70mm

[0077] Comparative Example 1 The resin composition was prepared and evaluated in the same manner as in Example 1, except that the aromatic polyether obtained in Production Example 2 was used. The results are shown in Table 2.

[0078] [Table 2]

[0079] Table 2 shows that, for aromatic polyethers having a similar weight-average molecular weight, the resin composition using the aromatic polyether of Example 1 has a lower volume resistivity and superior electrical properties compared to the resin composition using the aromatic polyether of Comparative Example 1.

Claims

1. The radical amount at 25°C was measured using TEMPOL as the standard substance and benzene as the solvent for the standard substance, and was 6.5 × 10⁻⁶. １５ A resin composition comprising an aromatic polyether having a spin / g or higher and a nanocarbon material.

2. The resin composition according to claim 1, wherein the mass ratio (aromatic polyether / nanocarbon material) is 99.9 / 0.1 to 90 / 10.

3. The resin composition according to claim 1 or 2, wherein the aromatic polyether comprises one or more selected from the group consisting of polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and polyetherketone (PEK).

4. The resin composition according to any one of claims 1 to 3, wherein the nanocarbon material comprises one or more selected from the group consisting of diamond nanocarbon, carbon nanotubes, and carbon nanofibers.

5. A fiber-reinforced resin composition comprising the resin composition according to any one of claims 1 to 4 and reinforcing fibers.

6. The fiber-reinforced resin composition according to claim 5, wherein the reinforcing fiber comprises one or more selected from the group consisting of glass fiber, carbon fiber, and aramid fiber.

7. A molded article obtained by molding one or more selected from the group consisting of the resin composition according to any one of claims 1 to 4 and the fiber-reinforced resin composition according to claim 5 or 6.

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