JP2014237736A - Polyphenylene sulfide resin composition and insulated wire using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyphenylene sulfide resin composition excellent in extensibility and an insulated wire having an insulated layer consisting of the resin composition and hardly generating crack of the insulated layer by coil molding.SOLUTION: There is provided a polyphenylene sulfide resin composition containing at least (A) a polyphenylene sulfide resin and (B) a thermoplastic polyether imide resin with 70 mass% to 95 mass% of (A) the polyphenylene sulfide resin and 5 mass% to 30 mass% of (B) the thermoplastic polyether imide resin based on 100 mass% of the total of (A) and (B).

Description

  The present invention relates to a polyphenylene sulfide resin composition and an insulated wire using the same, and more particularly to an insulated wire used for molding a motor coil.

  The industrial motor includes a coil formed by winding an insulated wire. The insulated electric wire which comprises a coil is provided with the insulating layer in the outer periphery of the conductor, and the insulating layer is formed by the method (baking method) which apply | coats and bakes an insulating coating material on the outer periphery of a conductor, for example.

  In recent years, industrial motors have been miniaturized, and coils have also been miniaturized accordingly. In order to reduce the size of the coil, the coil tends to improve the space factor of the insulated wire. As a method of forming such a coil, for example, there is a method of forming a coil by winding an insulated wire around a small diameter core with high tension at high density. As another method, there is a method of forming a coil by bending a plurality of short insulated wires into a desired shape and joining the ends of these insulated wires together by welding or the like. In any of the methods, since severe processing stress is applied to the insulated wire, high mechanical strength is required for the insulating layer.

  In addition, industrial motors are driven at a high voltage for higher output and are driven by an inverter for improved power performance. As a result, in an insulated wire that constitutes a coil of an industrial motor, there is an increased risk of partial discharge due to superposition of a high voltage and an inverter surge. When a partial discharge occurs in an insulated wire, the insulating layer is gradually eroded, the film thickness is reduced, and eventually insulation failure occurs. The voltage at which this partial discharge occurs is referred to as a partial discharge inception voltage (PDIV). In an insulating layer having a low PDIV, partial discharge occurs at a lower voltage, which tends to cause insulation failure. For this reason, a higher PDIV is required for the insulating layer of the insulated wire so that partial discharge does not occur at a low voltage.

  In order to improve the PDIV of the insulating layer, reduction of the relative dielectric constant of the insulating layer and thickening of the insulating layer can be mentioned.

  In order to reduce the relative dielectric constant of the insulating layer, a resin having a low relative dielectric constant is used for the insulating layer. Such resins include, for example, fluorine-containing polyimide resins or polyamide-imide resins, but these resins are expensive and difficult to apply to insulating layers of insulated wires.

  In order to increase the thickness of the insulating layer, in the case of the baking method, the number of times the insulating coating is baked is increased. In the baking method, although the film thickness of the insulating layer formed by one application / baking is thin (about several μm), the insulating layer can be thickened by increasing the number of times of baking. However, when the insulating layer is thickened by the baking method, not only the number of times of baking is increased and the cost is increased, but also the insulating layer to be formed is liable to deteriorate and the appearance may be deteriorated.

  Therefore, in place of the baking method, a method of extruding a thermoplastic resin onto a conductor (extrusion method) has been studied. In the extrusion method, the molten resin can be extruded to form an insulating layer, and the insulating layer can be easily thickened. Examples of the thermoplastic resin used in the extrusion method include engineering plastics such as polyphenylene sulfide resin (hereinafter also referred to as PPS resin), polyethersulfone resin, polyetherimide resin, and polyetheretherketone resin. Among these, PPS resin has attracted attention because it has excellent mechanical properties as well as excellent mechanical strength.

  When the PPS resin is used for the insulating layer, for example, another resin having different characteristics from the PPS resin is mixed with the PPS resin to form a polymer alloy. In polymer alloying, a polyphenylene sulfide resin composition having a predetermined phase separation structure (hereinafter, referred to as “polyphenylene sulfide resin composition”) is prepared by kneading two or more kinds of resins, that is, a PPS resin and another resin, to disperse the other resin in the PPS resin. A PPS resin composition). This phase separation structure has a structure in which island phases (dispersed phases) containing other resins are dispersed in a sea phase (continuous phase) containing PPS resins. According to the PPS resin composition, by having a predetermined phase separation structure, characteristics derived from the PPS resin and characteristics derived from other resins can be obtained. That is, the PPS resin is modified by polymer alloying with another resin, and different characteristics derived from the other resin are imparted.

  When modifying the PPS resin, the resin to be mixed is appropriately selected depending on the properties imparted to the PPS resin. As a resin mixed with the PPS resin, for example, in Patent Document 1, a thermoplastic elastomer is used for the purpose of imparting resistance to processing strain to the PPS resin. In Patent Document 2, polyolefin is used for the purpose of imparting moldability to the PPS resin.

JP 2010-55964 A JP 2011-222432 A

However, in the insulated wire provided with an insulating layer made of the PPS resin composition shown in Patent Documents 1 and 2, when bending into a predetermined shape and forming the coil by joining ends together, the bending process There was a possibility that the insulating layer would crack. The crack of the insulating layer is caused by insufficient stretchability of the insulating layer, and occurs because the insulating layer cannot be stretched in response to a load such as stretching or bending during bending.
In addition, the insulated wires shown in Patent Documents 1 and 2 are required to be applied to a method of forming a coil by winding the insulated wire around a core for the purpose of speeding up the coil forming. Has become difficult. When a coil is formed by winding an insulated wire around a core, a higher winding speed (winding speed) is required, and the load (tension) applied to the insulated wire tends to be higher. When this coil forming method is applied to the insulated wires shown in Patent Documents 1 and 2, the insulating layer has insufficient stretchability, and the insulating layer is easily cracked by a high load. For this reason, in the insulated wire shown in patent documents 1 and 2, it is difficult to apply a method of forming a coil by winding it around a core.

  Then, an object of this invention is to provide the insulated wire which is provided with the polyphenylene sulfide resin composition excellent in extensibility, and the insulating layer which consists of the resin composition, and is hard to produce a crack of an insulating layer by coil shaping | molding.

  In order to achieve the above object, the present inventors have studied a resin that is mixed to modify the PPS resin and that can improve the extensibility of the PPS resin. As a result of investigation, it has been found that a thermoplastic polyetherimide resin (hereinafter also referred to as PEI resin) is optimal as such a resin.

  Although PEI resin is excellent in heat resistance, mechanical strength, etc., it is known that it is inferior in extensibility like PPS resin. Specifically, the PEI resin has a tensile elongation (see Examples described later) that is an index of extensibility of about 60%, and the PPS resin has a tensile elongation of about 190%. The tensile elongation is lower than 200% required for increasing the linear velocity. That is, from the extensibility of the PEI resin, it was not predicted that the extensibility of the PPS resin composition could be improved even when mixed with the PPS resin. For this reason, conventionally, it has not been found that a PEI resin is used as a resin that improves the extensibility of the PPS resin.

  However, according to the study by the present inventors, even if the PEI resin is inferior in extensibility, it is mixed with the PPS resin at a predetermined ratio, and polymerized to form a rigidity and insulating property of the PPS resin. It was also found that the elongation of the resulting PPS resin composition can be improved to 200% or more without impairing various properties such as chemical resistance. That is, it has been found that by mixing the PEI resin, excellent extensibility can be obtained together with excellent characteristics derived from the PPS resin.

  The present invention has been made based on the above findings and is as follows.

According to a first aspect of the invention,
It contains at least (A) polyphenylene sulfide resin and (B) thermoplastic polyetherimide resin, and 70 masses of (A) polyphenylene sulfide resin with respect to 100 mass% of the total of (A) and (B). % To 95% by mass, and a polyphenylene sulfide resin composition containing 5% by mass to 30% by mass of the thermoplastic polyetherimide resin (B).

According to a second aspect of the invention,
1st aspect which contains (C) polyamide resin and contains the said (C) polyamide resin 2 mass% or more and 10 mass% or less with respect to a total of 100 mass% of said (A) and said (B). The polyphenylene sulfide resin composition is provided.

According to a third aspect of the invention,
Furthermore, (D) a compatibilizing agent containing at least one functional group selected from an epoxy group, a carboxyl group and an acid anhydride group is contained, and the total amount of (A) and (B) is 100% by mass, (D) The polyphenylene sulfide resin composition of the 1st or 2nd aspect containing 2 mass% or more and 10 mass% or less of a compatibilizing agent is provided.

According to a fourth aspect of the invention,
An insulated wire provided with an insulating layer made of the polyphenylene sulfide resin composition according to any one of the first to third aspects on the outer periphery of a conductor is provided.

According to a fifth aspect of the present invention,
An insulated wire in which the tensile elongation of the insulating layer is 200% or more is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the insulated wire which is provided with the polyphenylene sulfide resin composition excellent in extensibility, and the insulating layer which consists of the resin composition, and is hard to produce a crack of an insulating layer by coil shaping | molding is obtained.

It is sectional drawing of the insulated wire which concerns on one Embodiment of this invention.

[1. Polyphenylene sulfide resin composition]
As described above, the polyphenylene sulfide resin composition (PPS resin composition) according to an embodiment of the present invention includes at least (A) a polyphenylene sulfide resin (PPS resin) and (B) a thermoplastic polyetherimide resin (PEI). Resin) and a phase separation structure in which (B) island phase (dispersed phase) containing PEI resin is dispersed in (A) sea phase (continuous phase) containing PPS resin. doing. In addition to the above essential components, the PPS resin composition comprises (C) a polyamide resin (PA resin), (D) a compatibilizer containing at least one functional group selected from an epoxy group, a carboxyl group, and an acid anhydride group. , Or both.

  Hereinafter, each component of the PPS resin composition will be described in detail.

<1-1. (A) PPS resin>
(A) The PPS resin constitutes a sea phase (continuous phase) in the phase separation structure of the PPS resin composition, and (B) contains an island phase (dispersed phase) containing the PEI resin. (A) The PPS resin is a crystalline thermoplastic resin and has excellent mechanical strength, insulating properties, and chemical resistance. However, since it is a crystalline resin, it is inferior in extensibility, and the tensile elongation (see the examples described later), which is an index of extensibility, is about 190%, which is necessary for increasing the winding speed. Lower than 200%.

  (A) The PPS resin has, for example, a repeating unit represented by the following formula (1).

  (A) The PPS resin preferably contains 85% or more, more preferably 90% or more of the repeating unit represented by the above formula (1) from the viewpoint of mechanical strength and heat resistance. Thereby, heat resistance can be improved more.

  (A) In addition to the structure represented by the above formula (1), the PPS resin may contain a sulfoxide group or an ether group, and may contain a substituent in the benzene ring. Further, the molecular chain may contain a branched structure or a crosslinked structure via a thioether group or an ether group.

  (A) The melt viscosity of the PPS resin is not particularly limited, but is preferably high. Thereby, mechanical strength can be improved. As the melt viscosity, for example, the melt viscosity measured at a heating temperature of 310 ° C. and a shear rate of 1000 / s is preferably greater than 80 Pa · s, and more preferably 150 Pa · s or more. Moreover, although the upper limit of melt viscosity is not specifically limited, Since the moldability at the time of melt-extruding a PPS resin composition can be improved, it is preferable that it is 600 Pa * s or less.

  (A) Content of PPS resin is 70 mass% or more and 95 mass% or less with respect to 100 mass% of the sum total of (A) PPS resin and (B) PEI resin. (A) By making content of PPS resin into the said numerical range, while being able to improve the chemical resistance by (A) PPS resin more, the content of (B) PEI resin to mix increases, and PPS resin composition Since the elongation of the product can be further improved, both chemical resistance and elongation can be achieved.

<1-2. (B) PEI resin>
(B) The PEI resin constitutes an island phase (dispersed phase) dispersed in the sea phase (continuous phase) containing the (A) PPS resin in the phase separation structure of the PPS resin composition. (B) PEI resin is an amorphous thermoplastic resin, and is excellent in heat resistance, mechanical strength, and the like. However, since the glass transition temperature is high, the stretchability is inferior similarly to the (A) PPS resin, and the tensile elongation is as low as about 60%. Moreover, since it is an amorphous resin, it is inferior to chemical resistance compared with (A) PPS resin.

  (B) As shown in the following formula (2) or (3), for example, the PEI resin has an ether group having a melt moldability and a cyclic imide group.

  (B) Content of PEI resin is 5 mass% or more and 30 mass% or less with respect to 100 mass% of the sum total of (A) PPS resin and (B) PEI resin. (B) By making the content of the PEI resin within the above numerical range, the elongation of the PPS resin composition can be further improved, and the chemical resistance of the PPS resin composition can be improved by reducing the content of the (B) PEI resin. Therefore, it is possible to achieve both chemical resistance and extensibility.

<1-3. Phase separation structure>
As described above, the PPS resin composition of the present embodiment is obtained by mixing and kneading (A) PPS resin and (B) PEI resin at a predetermined ratio, and has a predetermined phase separation structure. ing. By having this predetermined phase separation structure, the PPS resin composition develops extensibility that cannot be predicted from the extensibility of each resin. Specifically, a PPS resin composition is prepared by mixing (A) PPS resin having a tensile elongation of about 190% and (B) PEI resin having a tensile elongation of about 60%, which is an index of elongation. Then, the tensile elongation is 200% or more.

  Here, the phase separation structure in the PPS resin composition of the present embodiment and the elongation exhibited by the phase separation structure will be described.

  The phase separation structure is generally formed by mixing resins that are incompatible with each other. In this respect, (A) PPS resin and (B) PEI resin have low compatibility and are not completely compatible with each other, so that a phase separation structure is formed. However, these resins are close in solubility parameter (hereinafter also referred to as SP value) as an index of compatibility, and have high affinity. Therefore, these resins are not completely compatible but are easily mixed. That is, (B) PEI resin is excellent in dispersibility in (A) PPS resin and can be finely dispersed. As a result, in the phase separation structure, (B) the island phase containing the PEI resin is miniaturized and (A) is finely dispersed in the sea phase containing the PPS resin. Further, since the two resins have close SP values, it is estimated that a part of (B) PEI resin is compatible with (A) PPS resin. As described above, the PPS resin composition forms a phase separation structure in which the refined island phase is finely dispersed in the sea phase, and (B) PEI in a part of the sea phase containing (A) the PPS resin. It is estimated that the resin is in a partially compatible state in which the resins are compatible.

  By forming such a fine phase-separated structure, the PPS resin composition exhibits elongation that cannot be predicted from the resin to be mixed. That is, when (A) the island phase containing the PEI resin is finely dispersed in the sea phase containing the (A) PPS resin, the crystallization of the (A) PPS resin is suppressed, and the elongation due to the crystallization is reduced. Presumed to be suppressed. In the (A) PPS resin constituting the sea phase, the (B) PEI resin is partially compatible with the (A) PPS resin, so that crystallization is further suppressed and a decrease in extensibility is suppressed. Presumed to be.

  Therefore, the PPS resin composition of the present embodiment forms a phase separation structure with a predetermined resin, and (A) crystallization of the PPS resin is suppressed and expresses elongation that is not expected from the mixing of the resin. The tensile elongation is 200% or more.

The SP value is obtained by, for example, calculating the cohesive energy of the resin from atomic groups in the resin, and is a physical property value used for predicting the solubility of the resin in various solvents. According to the SP value, the compatibility (ease of mixing) of the resins can be predicted by comparing the SP values of different resins. Specifically, the SP value of (A) PPS resin is 13.1 (cal / cm ³ ) ^1/2 , and the SP value of (B) PEI resin is 13.5 (cal / cm ³ ) ^1/2. It is. (A) As a resin for modifying the PPS resin, there is, for example, a polyamide resin, and the SP value of the polyamide resin is 12.6 (cal / cm ³ ) ^1/2 . Since (A) PPS resin (SP value 13.1) is closer in SP value to (B) PEI resin (SP value 13.5) than polyamide resin (SP value 12.6), (A) PPS resin It can be seen that (B) the compatibility with PEI resin is relatively high. That is, according to (A) PPS resin and (B) PEI resin, a finer phase separation structure can be formed.

<1-4. (C) PA resin>
The PPS resin composition contains at least (A) PPS resin and (B) PEI resin as essential components, but preferably further contains (C) PA resin.

  (C) PA resin comprises the island phase disperse | distributed to the sea phase containing (A) PPS resin similarly to (B) PEI resin. (C) PA resin has a glass transition temperature higher than that of (A) PPS resin, and can improve the heat distortion resistance of the PPS resin composition.

  The content of (C) PA resin is preferably 2% by mass or more and 10% by mass or less with respect to 100% by mass of the total of (A) PPS resin and (B) PEI resin. (C) When the content of the polyamide resin is 2% by mass or more, the heat distortion resistance can be improved without impairing the long-term heat resistance of the PPS resin composition.

  (C) As PA resin, for example, nylon 46 which is an aliphatic polyamide, nylon 6T which is an aromatic polyamide (copolycondensation polymer of hexamethylenediamine and terephthalic acid) and nylon 6I (hexamethylenediamine and isophthalic acid) Copolycondensation polymer), nylon 9T (copolycondensation polymer of nonanediamine and terephthalic acid), nylon M-5T (copolycondensation polymer of methylpentadiamine and terephthalic acid), nylon 6T / 66 (nylon 6T and nylon 66), nylon 6T / 6I (copolymer of nylon 6T and nylon 6I), nylon 6T / 6I / 66 (copolymer of nylon 6T, nylon 6I and nylon 66), nylon 6T / M-5T (copolymer of nylon 6T and nylon M-5T), nylon 6T / 6 (nylon 6T and nano Copolymers of Ron 6), and the like. As the resin (B), the above polyamides may be used alone or in combination.

<1-5. (D) Compatibilizer>
The PPS resin composition includes at least (A) a PPS resin and (B) a PEI resin as essential components, but further includes (D) a phase including at least one functional group selected from an epoxy group, a carboxyl group, and an acid anhydride group. It preferably contains a solubilizer.

  The (D) compatibilizer constitutes an island phase dispersed in the sea phase containing the (A) PPS resin, similarly to the (B) PEI resin. (D) The compatibilizer can react with the reactive functional group of (A) PPS resin, (B) PEI resin, or (C) polyamide resin, depending on its functional group. (A) The dispersibility in the PPS resin can be improved, and a finer phase separation structure can be formed.

  The content of the (D) compatibilizer is preferably 2% by mass or more and 10% by mass or less with respect to 100% by mass of the total of (A) PPS resin and (B) PEI resin. (D) If the content of the compatibilizer is 2% by mass or more, the adhesion of the PPS resin composition to the conductor or the like can be further improved.

  As a compatibilizing agent containing an epoxy group, an olefin copolymer containing an epoxy group is preferable. Copolymers obtained by epoxidizing the double bond portion of the olefin-based copolymer, or monomers having an epoxy group and a double bond, other ethylene, propylene, butylene, pentene, hexene, methylbutene, methylpentene, styrene, Examples thereof include those copolymerized with an olefinic compound such as α-methylstyrene.

  Examples of compatibilizers containing carboxyl groups or acid anhydrides include olefinic compounds such as ethylene, propylene, butylene, pentene, hexene, methylbutene, methylpentene, styrene, α-methylstyrene, and α, β-unsaturated carboxylic acids. Examples thereof include a copolymer obtained by directly polymerizing a monomer and a copolymer produced by a method of graft copolymerization to an olefin copolymer. As the monomer used here, acrylic acid, methacrylic acid, maleic acid, maleic anhydride and the like can be preferably used.

[2. Method for producing polyphenylene sulfide resin composition]
Next, the manufacturing method of the above-mentioned PPS resin composition is demonstrated.

  First, the essential components (A) PPS resin and (B) PEI resin are mixed to form a mixture. At this time, with respect to a total of 100 mass% of (A) PPS resin and (B) PEI resin, (A) PPS resin is 70 mass% or more and 95 mass% or less, (B) PEI resin is 5 mass% or more and 30 mass%. Mix so that it becomes less than%. Further, when (C) PA resin, (D) compatibilizer, or both are further mixed, 2 (C) PA resin is added to 100% by mass of (A) PPS resin and (B) PEI resin. You may mix 2 mass% or more and 10 mass% or less of (D) compatibilizer.

  Subsequently, the obtained mixture is kneaded at a predetermined shear rate while heating to obtain the PPS resin composition of the present embodiment. In the PPS resin composition, a phase separation structure in which island phases containing (B) PEI resin are dispersed in a sea phase containing (A) PPS resin is formed by kneading. The melt viscosity is not particularly limited, but the melt viscosity measured under conditions of a heating temperature of 310 ° C. and a shear rate of 1000 / s is preferably greater than 80 Pa · s, and more preferably 150 Pa · s or more. . Moreover, although the upper limit of melt viscosity is not specifically limited, Since the moldability at the time of melt-extruding a PPS resin composition can be improved, it is preferable that it is 600 Pa * s or less.

  In the kneading step, the temperature at which the mixture is heated is not particularly limited as long as it is a temperature at which the mixture can be melted. That is, the heating temperature may be equal to or higher than the melting point of the (A) PPS resin or (B) PEI resin used.

  Moreover, as a kneading apparatus used in the kneading step, general-purpose devices such as a kneader, a Banbury mixer, a roll, a twin screw extruder can be used, but a twin screw extruder is preferable.

[3. Insulated wire]
Next, an insulated wire including an insulating layer made of the above PPS resin composition will be described with reference to FIG. FIG. 1 is a cross-sectional view of an insulated wire according to an embodiment of the present invention.

  The insulated wire 1 of this embodiment is provided with the conductor 10 and the insulating layer 11 formed so that the outer periphery of the conductor 10 may be coat | covered as shown in FIG. 1, and the insulating layer 11 is a PPS resin composition. It is made up of.

  As the conductor 10, other metal wires such as silver can be used in addition to copper wires and copper alloy wires made of low-oxygen copper, oxygen-free copper, or the like. Although FIG. 1 shows a case where the conductor 10 has a rectangular cross section, the present invention is not limited to this, and may be round, for example. Moreover, as the conductor 10, the strand wire which twisted the some conducting wire can also be used. Moreover, the conductor diameter of the conductor 10 is not specifically limited, The optimal numerical value is suitably selected according to a use.

  The insulating layer 11 is made of a PPS resin composition. The insulating layer 11 is formed by melt-extruding the PPS resin composition on the outer periphery of the conductor 10 so as to have a predetermined thickness. The thickness of the insulating layer 11 is not particularly limited, and an optimal value is appropriately selected according to the application. In the present embodiment, a PPS resin composition having a low relative dielectric constant is used, and even when the insulating layer 11 is thin, predetermined insulating characteristics can be obtained. The thickness of the insulating layer 11 can be, for example, 70 μm or more and 200 μm or less.

  Moreover, the insulating layer 11 consists of the above-mentioned PPS resin composition, and is excellent in extensibility. That is, even when the insulating layer 11 is bent while being greatly stretched when the insulated wire 1 is formed into a coil, cracks and the like are suppressed. Thereby, when shape | molding the insulated wire 1 in a coil, winding speed can be sped up and the productivity can be improved.

  In the insulated wire 1, an adhesive layer (not shown) may be provided between the conductor 10 and the insulating layer 11. The resin used for the adhesion layer is not particularly limited as long as the adhesion between the conductor 10 and the insulating layer 11 can be further improved. For example, polyamide imide, polyester imide, polyimide, epoxy resin, unsaturated carboxylic acid ester Resins, maleimide-containing olefin resins, and the like can be used.

  Further, the insulated wire 1 may be provided with another insulating layer (not shown) different from the insulating layer 11 to form a plurality of insulating layers. As another insulating layer, there exists an insulating layer with a high storage elastic modulus (for example, 10 Mpa or more) in high temperature (for example, 300 degreeC or more), for example. According to the insulating layer having a high elastic modulus at high temperature, it is possible to obtain an insulated wire having high heat resistance while suppressing softening at high temperature. Examples of the resin constituting such an insulating layer include resins having excellent heat resistance such as polyamideimide and polyimide.

[4. Effects according to this embodiment]
According to the present embodiment, the following one or more effects are achieved.

  The PPS resin composition of the present embodiment is formed by mixing at least (A) PPS resin and (B) PEI resin at a predetermined ratio, and has a predetermined fine phase separation structure. In the phase separation structure, the (B) PEI resin is finely dispersed in the (A) PPS resin, so that the crystallization of the (A) PPS resin is suppressed, and the decrease in elongation due to the crystallization is suppressed. . Thereby, the PPS resin composition of this embodiment has the extensibility with the tensile elongation of 200% or more with various characteristics, such as rigidity derived from (A) PPS resin, an insulation characteristic, and chemical resistance.

  Moreover, in the PPS resin composition of this embodiment, since compatibility of (A) PPS resin and (B) PEI resin is comparatively excellent, even if it does not contain a compatibilizer, (B ) PEI resin can be finely dispersed in (A) PPS resin. Thereby, in the PPS resin composition, predetermined elongation is obtained, and a decrease in heat resistance due to the compatibilizing agent is suppressed.

  Moreover, it is preferable that the PPS resin composition of this embodiment further contains (C) PA resin. (C) According to the PA resin, the heat distortion resistance can be improved without impairing the long-term heat resistance of the PPS resin composition.

  Moreover, it is preferable that the PPS resin composition of this embodiment further contains (D) a compatibilizing agent containing at least one functional group selected from an epoxy group, a carboxyl group, and an acid anhydride group. According to the (D) compatibilizer, the dispersibility of the (B) PEI resin in the (A) PPS resin can be improved, and a finer phase separation structure can be formed.

  Moreover, the insulated wire of this embodiment is equipped with the insulating layer which consists of a PPS resin composition excellent in elongation property. According to this insulated wire, even if it is bent into a predetermined shape or wound with a high tension due to an increase in winding speed, the insulating layer is unlikely to crack. That is, according to this insulated wire, the coil can be reduced in size and productivity.

  Next, examples of the present invention will be described. In this example, a polyphenylene sulfide resin composition was prepared, and an insulated wire was manufactured using the composition. And the obtained resin composition and insulated wire were evaluated. These examples are examples of the polyphenylene sulfide resin composition and the insulated wire according to the present invention, and the present invention is not limited to these examples.

(1) Raw materials The raw materials used in the following Examples and Comparative Examples are as follows.

(A) The following were used as polyphenylene sulfide resin.
(A) PPS resin: “Torelina T1881” manufactured by Toray Industries, Inc. (SP value 13.1, melt viscosity 259 Pa · s (heating temperature 310 ° C., shear rate 1000 / s))

(B) The following were used as polyetherimide resin.
(B) PEI resin: “Ultem Resin 1000” manufactured by SABIC (SP value 13.5)

(C) The following were used as the polyamide resin.
(C1) PA resin: “Genesta PA9T” manufactured by Kuraray Co., Ltd. (SP value 12.6)
(C2) PA resin: “Vestamide PA6T” (SP value 13.5) manufactured by Daicel-Evonik Co., Ltd.

(D) The following were used as compatibilizers.
(D1) Compatibilizer: “Bond First E” manufactured by Sumitomo Chemical Co., Ltd. (type of substituent: epoxy group)
(D2) Compatibilizer: “Bond First 2C” manufactured by Sumitomo Chemical Co. (substituent type: epoxy group)

(2) Preparation of polyphenylene sulfide resin composition A PPS resin composition was prepared using the above raw materials. The preparation conditions are shown in Table 1 below. In Table 1, the content of each component is shown by mass%.

In Examples 1 to 6, as shown in Table 1, components (A) to (D) were appropriately changed and combined to prepare PPS resin compositions.
Specifically, a raw material containing (A) PPS resin and (B) PEI resin is put into a twin screw extruder (28 mmφ, L / D = 30), and shearing is performed while controlling the screw speed of the twin screw extruder. By kneading at a speed of 1000 / s, a PPS resin composition having a predetermined phase separation structure was prepared. In kneading, in consideration of the decomposition temperature of the raw material to be added, the PPS resin composition was heated at a temperature that does not deteriorate. After kneading, the PPS resin composition was cooled and formed into pellets.

  In Examples 1 and 2, PPS resin compositions were prepared by changing the ratio of (A) PPS resin and (B) PEI resin. Regarding each content, in Example 1, (A) PPS resin was 95 mass%, (B) PEI resin was 5 mass%. Moreover, in Example 2, (A) PPS resin was 70 mass% and (B) PEI resin was 30 mass%.

  In Examples 3 and 4, (c1) PA resin was further added to 100% by mass of (A) 95% by mass of PPS resin and (B) 5% by mass of PEI resin. (C1) The PA resin content was 5% by mass in Example 3 and 2% by mass in Example 4.

  In Example 5, 5 mass% of (d1) compatibilizer was contained with respect to a total of 100 mass% of (A) PPS resin 90 mass% and (B) PEI resin 10 mass%.

  In Example 6, (c) PA resin 5 mass% and (d2) compatibilizer 5 mass% with respect to a total of 100 mass% of (A) PPS resin 90 mass% and (B) PEI resin 10 mass%. Was included.

  In Comparative Examples 1 to 4, resin compositions were prepared by combining raw materials according to the preparation conditions shown in Table 2. In Table 2, the content of each component is shown by mass%.

  In Comparative Example 1, a resin composition was prepared in the same manner as in Example except that (A) PPS resin and (B) PEI resin were not used in combination, and (A) PPS resin 100% by mass was used alone.

  In Comparative Example 2, a resin composition was prepared in the same manner as in Example except that (A) PPS resin and (B) PEI resin were not used in combination, and (B) 100% by mass of PEI resin was used alone.

  In Comparative Example 3, the ratio of (A) PPS resin and (B) PEI resin was changed to (A) PPS resin 60% by mass and (B) PEI resin 40% by mass, as in the examples. Prepared.

  Comparative Example 4 was prepared in the same manner as in Example except that (B) PEI resin was not used and (A) PPS resin, (c1) PA resin and (d1) compatibilizer were used.

(3) Production of insulated wire An insulated wire was produced using the PPS resin composition obtained above.
Specifically, the polyphenylene sulfide resin compositions of Examples 1 to 6 and Comparative Examples 1 to 4 were extrusion coated on the outer periphery of a flat conductor (flat cross section: about 2 mm × 3 mm), and the thickness was about 200 μm. An insulating layer was formed to produce an insulated wire. Prior to extrusion coating, the conductor was passed through a heating chamber set at 800 ° C. to preheat the conductor. Moreover, immediately after forming an insulating layer, the insulated wire was passed through the heating chamber set to 300 degreeC, and this insulated wire was heated.

(4) Evaluation method Moreover, it evaluated with the following method about the manufactured insulated wire.

(Tensile elongation)
In this example, the extensibility of the insulating layer of the insulated wire was evaluated by a tensile test. Specifically, the PPS resin composition obtained above was extruded with an outer diameter of about 2 mm to produce a strand having a length of about 50 mm simulating an insulating layer, and a tensile test was performed on the strand. In the tensile test, the distance between chucks is set to 20 mm, both ends of the strand are fixed to a tensile tester, and the elongation rate until the strand breaks when pulled at room temperature in the length direction at a tensile speed of 500 mm / min. Was measured as the elongation at break.

(Rapid extension)
In this example, in order to evaluate the adhesion of the insulating layer to the conductor, a rapid extension test simulating winding processing was performed on the insulated wire. Specifically, the insulated wire was extended at a speed of about 500 mm / min and was broken including the conductor. The conductor after fracture was observed, and the presence or absence of occurrence of cracks or cracks in the insulating layer and the float of the film at the fracture location were measured. In the case where there was no occurrence of cracking of the insulating layer and the float was 1 mm or less, the test was “good”, and the case other than that was “failed”.

(chemical resistance)
In this example, a chemical resistance test was performed on the insulated wire. Specifically, an insulated wire previously stretched by 2% was immersed in xylene at 60 ° C. for 30 minutes, and then the presence or absence of cracks or cracks in the insulating layer was confirmed. The case where cracks did not occur was evaluated as a pass “◯”, and the case where cracks occurred was evaluated as a “fail”.

(5) Evaluation results In Examples 1 to 6, as shown in Table 1, it was confirmed that all had a tensile elongation of 200% or more and excellent extensibility. Also, in the rapid extension test, no cracks or cracks were confirmed in the insulating layer, and the coating float was about 0.5 mm to 1.0 mm, confirming that the insulating layer had good adhesion. In addition, in terms of chemical resistance, it was confirmed that the insulating layer was excellent without cracks or cracks. In any of the examples, the chemical resistance was acceptable, but it was confirmed that the higher the proportion of (A) PPS resin in the examples, the better the chemical resistance.

On the other hand, in Comparative Example 1, as shown in Table 2, (A) PPS resin is used alone, and the tensile elongation is about 190%, but it is lower than 200% and the elongation is insufficient. It was confirmed that. Further, in the rapid extension test, it was confirmed that not only cracks and cracks occurred in the insulating layer, but the coating float was 1 mm or more, and the adhesion of the insulating layer was insufficient.
In Comparative Example 2, (B) PEI resin was used alone, and the tensile elongation was about 60%, and it was confirmed that the stretchability and adhesion of the insulating layer were insufficient as in Comparative Example 1. It was. Moreover, since it contained only (B) PEI resin, it was confirmed that chemical resistance is low.
In Comparative Example 3, it was confirmed that the tensile elongation decreased to about 40% because the content of (B) PEI resin increased. Moreover, since the content of (A) PPS resin fell by the increase in (B) PEI resin, it was confirmed that chemical resistance fell.
In Comparative Example 4, since (B) PEI resin was not mixed, it was confirmed that the tensile elongation decreased to about 40%.
As described above, it was confirmed that in each of Comparative Examples 1 to 4, the extensibility was insufficient, the film could not withstand a large tension, and was not suitable for increasing the winding speed.

1 Insulated wire 10 Conductor 11 Insulating layer

Claims (5)

Containing at least (A) a polyphenylene sulfide resin and (B) a thermoplastic polyetherimide resin,
For a total of 100% by mass of (A) and (B),
70 mass% or more and 95 mass% or less of said (A) polyphenylene sulfide resin,
A polyphenylene sulfide resin composition comprising the thermoplastic polyetherimide resin (B) in an amount of 5% by mass to 30% by mass. Furthermore, (C) a polyamide resin is contained,
For a total of 100% by mass of (A) and (B),
2. The polyphenylene sulfide resin composition according to claim 1, comprising (C) 2% by mass to 10% by mass of the polyamide resin. And (D) a compatibilizing agent containing at least one functional group selected from an epoxy group, a carboxyl group and an acid anhydride group,
For a total of 100% by mass of (A) and (B),
The polyphenylene sulfide resin composition according to claim 1, wherein the compatibilizer (D) is contained in an amount of 2% by mass to 10% by mass. An insulated wire comprising an insulating layer made of the polyphenylene sulfide resin composition according to any one of claims 1 to 3 on an outer periphery of a conductor. The insulated wire according to claim 4, wherein a tensile elongation of the insulating layer is 200% or more.

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