JP2016201227A - Method for producing non-halogen multilayer insulating wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a non-halogen multilayer insulating wire which uses polybutylene naphthalate as an insulation coating material, is excellent in appearance, and enables a long work.SOLUTION: A method for producing a non-halogen multilayer insulating wire 10 includes: a step of extrusion coating a polyolefin-based resin composition containing 50-95 pts.mass of high-density polyethylene and 5-50 pts.mas of an ethylene copolymer at a temperature higher than 280°C onto a conductor 1, to provide an insulator inner layer 2; and extrusion coating a polyester-based resin composition containing a base polymer containing polybutylene naphthalate as a main component, and 50-150 pts.mass of a polyester block copolymer, 0.5-5 pts.mass of a hydrolysis inhibitor, 0.5-5 pts.mass of an inorganic porous filler, and 10-30 pts.mass of magnesium hydroxide with respect to 100 pts.mass of the base polymer at a temperature higher than 280°C, onto the outside the insulator inner layer 2, to provide an insulator outer layer 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a halogen-free multilayer insulated wire.

  Insulated wires using polybutylene naphthalate as an insulating coating material are generally known as described in Patent Documents 1 to 3, for example.

  In the insulated wire described in Patent Document 1, polybutylene naphthalate is used for the insulating layer that is coated immediately above the conductor. On the other hand, in the insulated wires described in Patent Documents 2 to 3, the insulating layer is provided in multiple layers, and polybutylene naphthalate is used for the outer layer of the insulator.

JP 2009-4335 A JP 2014-102952 A JP, 2014-103011, A

  However, an insulated wire using polybutylene naphthalate as an insulating coating material, particularly an insulated wire using polybutylene naphthalate in an insulating layer coated directly on a conductor, may cause a problem of poor appearance. As a result, long work cannot be performed and productivity cannot be increased.

  As a cause of the appearance defect, a residue considered to be generated during resin extrusion of the resin composition containing polybutylene naphthalate adheres to the conductor surface, and this is mixed into the inside of the extrusion coating layer or the interface between the conductor and the extrusion coating layer. It is considered that a convex portion (defective appearance) is generated on the surface of the electric wire.

  Accordingly, an object of the present invention is to provide a method for producing a halogen-free multi-layer insulated wire that has excellent appearance and enables long work while using polybutylene naphthalate as an insulating coating material.

  In order to achieve the above object, the present invention provides the following non-halogen multilayer insulated wire manufacturing method.

[1] A step of providing an insulator layer on a conductor by extrusion-coating a polyolefin resin composition containing 50 to 95 parts by mass of high-density polyethylene and 5 to 50 parts by mass of an ethylene copolymer at a temperature higher than 280 ° C. In addition, a base polymer mainly composed of polybutylene naphthalate is included outside the insulator layer, and 50 to 150 parts by mass of a polyester block copolymer with respect to 100 parts by mass of the base polymer, a hydrolysis inhibitor 0 .5-5 parts by mass, 0.5-5 parts by mass of an inorganic porous filler, and 10-30 parts by mass of magnesium hydroxide are extrusion-coated at a temperature higher than 280 ° C. and outside the insulator. And a step of providing a layer. A method for producing a non-halogen multilayer insulated wire.
[2] The non-halogen multilayer insulated wire according to [1], wherein the extrusion coating temperature in the step of providing the insulator layer and the step of providing the insulator outer layer is in the range of 285 to 320 ° C. Method.
[3] The method for producing a halogen-free multilayer insulated wire according to [1] or [2], wherein the step of providing the insulator layer and the step of providing the insulator outer layer are performed simultaneously.

  ADVANTAGE OF THE INVENTION According to this invention, while using polybutylene naphthalate as an insulation coating material, the manufacturing method of the non-halogen multilayer insulated wire which is excellent in the external appearance and enables a long work can be provided.

It is sectional drawing of the halogen-free multilayer insulated wire manufactured by the manufacturing method of the halogen-free multilayer insulated wire which concerns on embodiment of this invention.

  FIG. 1 is a cross-sectional view of a non-halogen multilayer insulated wire manufactured by a method for manufacturing a halogen-free multilayer insulated wire according to an embodiment of the present invention.

  In the method for producing a halogen-free multilayer insulated wire 10 according to an embodiment of the present invention, a polyolefin resin composition containing 50 to 95 parts by mass of high-density polyethylene and 5 to 50 parts by mass of an ethylene copolymer is formed on the conductor 1 at 280 ° C. A step of providing an insulator layer 2 by extrusion coating at a higher temperature (hereinafter referred to as a first step), and a base polymer containing polybutylene naphthalate as a main component on the outside of the insulator layer 2; Polyester block copolymer 50 to 150 parts by mass, hydrolysis inhibitor 0.5 to 5 parts by mass, inorganic porous filler 0.5 to 5 parts by mass, and magnesium hydroxide 10 to 100 parts by mass of polymer. A step of extrusion-coating a polyester resin composition containing 30 parts by mass at a temperature higher than 280 ° C. to provide the insulator outer layer 3 (hereinafter referred to as a second step). Including the. Hereafter, each said process is demonstrated in detail, respectively.

(First step)
In the first step, a polyolefin resin composition containing 50 to 95 parts by mass of high-density polyethylene and 5 to 50 parts by mass of an ethylene copolymer is extrusion coated on the conductor 1 at a temperature higher than 280 ° C. Layer 2 is provided. The extrusion coating temperature is preferably in the range of 285 to 320 ° C, and more preferably in the range of 285 to 310 ° C.

  As the conductor 1, the conductor generally used in the insulated wire can be used. For example, it is preferable to use a tinned annealed copper stranded wire.

  The polyolefin resin composition used for the insulator layer 2 contains 50 to 95 parts by mass of high-density polyethylene and 5 to 50 parts by mass of an ethylene copolymer. Furthermore, it is preferable to contain 0.1-1 mass part of metal harm prevention agents.

<High density polyethylene>
Although the high-density polyethylene in the embodiment of the present invention is not particularly limited, for example, one having a density of 0.942 g / cm ³ or more is preferable. The high density polyethylene needs to be contained in the range of 60 to 95 parts by mass. The preferable content of the high-density polyethylene is 60 to 90 parts by mass, the more preferable content is 60 to 80 parts by mass, and the more preferable content is 60 to 70 parts by mass.

<Ethylene copolymer>
Examples of the ethylene copolymer in the embodiment of the present invention include ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-styrene copolymer, ethylene-glycidyl methacrylate copolymer, ethylene- Butene-1 copolymer, ethylene-butene-hexene terpolymer, ethylene-propylene-diene terpolymer (EPDM), ethylene-octene copolymer (EOR), ethylene copolymer polypropylene, ethylene-propylene Copolymer (EPR), poly-4-methyl-pentene-1, maleic acid grafted low density polyethylene, hydrogenated styrene-butadiene copolymer (H-SBR), maleic acid grafted linear low density polyethylene, ethylene and Copolymer with α-olefin having 4 to 20 carbon atoms, Mainly composed of inic acid grafted ethylene-methyl acrylate copolymer, maleic acid grafted ethylene-vinyl acetate copolymer, ethylene-maleic anhydride copolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer, butene-1. An ethylene-propylene-butene-1 terpolymer as a component can be used. Preferred are EEA, EVA and ethylene-glycidyl methacrylate copolymers. More preferred are EEA and EVA. These may be used alone or in combination of two or more. The ethylene copolymer needs to be contained in the range of 5 to 40 parts by mass. The preferable content of the ethylene copolymer is 10 to 40 parts by mass, and the more preferable content is 10 to 30 parts by mass.

  The ethyl acrylate content (EA amount) of the ethylene ethyl acrylate copolymer is preferably 9 to 35% by mass, particularly in terms of flame retardancy and mechanical properties. In addition, the vinyl acetate content (VA amount) of the ethylene vinyl acetate copolymer is preferably 15 to 45% by mass particularly in terms of flame retardancy and mechanical properties.

<Metal harm prevention agent>
The metal harm preventing agent has an effect of stabilizing metal ions by chelate formation and suppressing oxidative degradation. Although the metal harm prevention agent in embodiment of this invention is not specifically limited, It is preferable that it is a copper harm prevention agent. It is preferable that a copper damage inhibitor consists of 1 or more types chosen from a hydrazine derivative and a salicylic acid derivative. 1,2-bis [3- (4-hydroxy-3,5-di-tert-butylphenyl) propionyl)] hydrazine (trade name: Irganox MD1024, IRGANOX is a registered trademark) is more preferable. It is preferable to contain a metal harm inhibiting agent in 0.1-1 mass part. The more preferable content of the metal harm preventing agent is 0.3 to 1 part by mass, and the more preferable content is 0.5 to 1 part by mass. When the addition amount of the metal damage inhibitor is less than 0.1 parts by mass, the effect of suppressing metal damage is small, and when it exceeds 1 part by mass, poor dispersion occurs and mechanical properties are deteriorated.

(Second step)
In the second step, the outer side of the insulator layer 2 includes a base polymer mainly composed of polybutylene naphthalate, and the polyester block copolymer is 50 to 150 parts by mass with respect to 100 parts by mass of the base polymer. Extruded polyester resin composition containing 0.5-5 parts by mass of hydrolysis inhibitor, 0.5-5 parts by mass of inorganic porous filler, and 10-30 parts by mass of magnesium hydroxide at a temperature higher than 280 ° C. The insulator outer layer 3 is provided by coating. The extrusion coating temperature is preferably in the range of 285 to 320 ° C, and more preferably in the range of 285 to 310 ° C.

  The first step (the step of providing the insulator layer 2) and the second step (the step of providing the insulator outer layer 3) can be performed separately, but are more preferably performed simultaneously. Further, if necessary, the extrusion-coated multilayer insulated wire 10 may be irradiated and crosslinked.

  The “base polymer having polybutylene naphthalate as a main component” means that the component having the largest amount of polybutylene naphthalate in the base polymer. That is, it means that the content of polybutylene naphthalate in the base polymer is 50% by mass or more. Preferably, it is 70 mass% or more, More preferably, it is 80 mass% or more, More preferably, it is 90 mass% or more. The reason for using polybutylene naphthalate is that it is excellent in heat resistance and wear resistance.

  As polyester resins other than polybutylene naphthalate, for example, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate and the like can be used in combination as long as the effects of the present invention are not impaired. Moreover, it can be used by mixing with polypropylene resin, polyethylene resin, or the like.

  Polybutylene naphthalate in the embodiment of the present invention is a polyester having naphthalene dicarboxylic acid, preferably naphthalene-2,6-dicarboxylic acid as a main acid component and 1,4-butanediol as a main glycol component, A polyester in which all or most of the repeating units (usually 90 mol% or more, preferably 95 mol% or more) is butylene naphthalene dicarboxylate.

  Polybutylene naphthalate can copolymerize the following components as long as the physical properties are not impaired.

  Examples of the acid component include aromatic dicarboxylic acids other than naphthalenedicarboxylic acid, such as phthalic acid, isophthalic acid, terephthalic acid, diphenyldicarboxylic acid, diphenyletherdicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenylmethanedicarboxylic acid, diphenylketonedicarboxylic acid, diphenylsulfide Examples include dicarboxylic acid, diphenylsulfone dicarboxylic acid, aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid, and alicyclic dicarboxylic acid such as cyclohexane dicarboxylic acid, tetralin dicarboxylic acid, decalin dicarboxylic acid and the like.

  As glycol components, ethylene glycol, propylene glycol, trimethylene glycol, pentamethylene glycol, hexamethylene glycol, octamethylene glycol, neopentyl glycol, cyclohexanedimethanol, xylylene glycol, diethylene glycol, polyethylene glycol, bisphenol A, catechol, resorcinol Examples include quinol, hydroquinone, dihydroxydiphenyl, dihydroxydiphenyl ether, hydroquinone, dihydroxydiphenyl, dihydroxydiphenyl ether, dihydroxydiphenylmethane, dihydroxydiphenyl ketone, dihydroxydiphenyl sulfide, and dihydroxydiphenyl sulfone.

  Examples of the oxycarboxylic acid component include oxybenzoic acid, hydroxynaphthoic acid, hydroxydiphenylcarboxylic acid, and ω-hydroxycaproic acid.

  It should be noted that trifunctional or higher functional compounds such as glycerin, trimethylpropane, pentaerythritol, trimellitic acid, pyromellitic acid and the like may be copolymerized as long as the polyester does not substantially lose molding performance.

  There is no particular limitation on the terminal carboxyl group concentration of polybutylene naphthalate in the present embodiment, but a smaller one is desirable.

  The polybutylene naphthalate can be obtained by polycondensation of naphthalene dicarboxylic acid and / or a functional derivative thereof and butylene glycol and / or a functional derivative thereof using a conventionally known aromatic polyester production method.

<Polyester block copolymer>
The polyester resin composition used for the insulator outer layer 3 includes a polyester block copolymer. The reason for adding the polyester block copolymer is to further increase the heat resistance and to provide flexibility.

  The polyester block copolymer needs to be added in the range of 50 to 150 parts by mass with respect to 100 parts by mass of the base polymer. More preferably, it is 60-100 mass parts. When the addition amount is less than 50 parts by mass, the heat resistance is lowered. On the other hand, when the addition amount exceeds 150 parts by mass, the elastic modulus of the material is lowered, and the mechanical properties, particularly the wear resistance, are markedly lowered.

  The polyester block copolymer used in the embodiment of the present invention has a hard segment of 60 mol% or more (preferably 70 mol% or more) containing polybutylene terephthalate as a main constituent, but in addition to benzene other than terephthalic acid. Or a diol such as an aromatic dicarboxylic acid containing a naphthalene ring, an aliphatic dicarboxylic acid having 4 to 12 carbon atoms, an aliphatic diol having 2 to 12 carbon atoms other than tetramethylene glycol, and an alicyclic diol such as cyclohexanedimethanol. It may be polymerized, and the copolymerization ratio is less than 30 mol%, preferably less than 10 mol%, based on the total dicarboxylic acid. The smaller the copolymerization ratio, the higher the melting point and the better. However, copolymerization is also performed to increase flexibility. However, when the copolymerization ratio is increased, the compatibility between the polyester block copolymer and the polybutylene naphthalate resin is lowered, and the wear resistance may be impaired.

  On the other hand, the soft segment of the polyester block copolymer is 99 to 90 mol% aromatic dicarboxylic acid, 1 to 10 mol% linear aliphatic dicarboxylic acid having 6 to 12 carbon atoms, and the diol component is 6 to 6 carbon atoms. Polyester which is 12 linear diols. Examples of the aromatic dicarboxylic acid include terephthalic acid and isophthalic acid. Examples of the linear aliphatic dicarboxylic acid having 6 to 12 carbon atoms include adipic acid and sebacic acid. The amount of the linear aliphatic dicarboxylic acid is preferably 1 to 10 mol%, more preferably 2 to 5 mol%, based on the total acid component of the polyester constituting the soft segment. If it is 10 mol% or more, the compatibility with the polybutylene naphthalate resin is lowered. Moreover, since the softness | flexibility of a soft segment will be impaired at 1 mol% or less, the softness | flexibility of this polyester-type resin composition is impaired as a result. Since the polyester constituting the soft segment needs to be amorphous or low crystalline, it is preferable to use isophthalic acid for 20 mol% or more of the total acid component constituting the soft segment. In addition, the soft segment can be copolymerized with some other components in the same manner as the hard segment. However, since the compatibility with the polybutylene naphthalate resin is lowered, the amount of the copolymer component is preferably 10 mol% or less, more preferably 5 mol% or less.

  In the polyester block copolymer used in the present embodiment, the mass ratio of the hard segment to the soft segment is preferably 20 to 50:80 to 50, more preferably 25 to 40:75 to 60. When the mass ratio of the hard segment is larger than the above range, it is not preferable because it becomes hard and difficult to use, and when the mass ratio of the soft segment is larger than the above range, the crystallinity is reduced and handling is difficult. This is not preferable.

  Moreover, the segment length of the soft segment and hard segment of the polyester block copolymer is preferably about 500 to 7000, more preferably 800 to 5000 when expressed in terms of molecular weight, but is not particularly limited. . Although it is difficult to directly measure the segment length, for example, the composition of the polyester constituting the soft segment and the hard segment, the melting point of the polyester comprising the components constituting the hard segment, and the obtained polyester block copolymer From the melting point, it can be estimated using the Flory equation.

  The melting point (T) of the polyester block copolymer is preferably in the range of “TO-5> T> TO-60” (TO: melting point of polymer composed of components constituting the hard segment). That is, the melting point (T) is preferably between TO-5 and TO-60, more preferably between TO-10 and TO-50, and even more preferably between TO-15 and TO-40. It is better to do so.

  Further, the melting point (T) is preferably 10 ° C. or more, preferably 20 ° C. or more higher than the melting point of the random copolymer. When the melting point of the random copolymer is not determined, the melting point (T) should be 150 ° C. or higher, preferably 160 ° C. or higher.

  When a random copolymer is used instead of the above polyester block copolymer, this polymer is generally amorphous and has a low glass transition temperature, so it is in a water tank shape, and the moldability is significantly reduced. The surface is not sticky and cannot be used as a real problem.

  The polyester block copolymer used in the present embodiment preferably has an intrinsic viscosity of 0.6 or more, more preferably 0.8 to 1.5, measured in 35 ° C. orthochlorophenol. If the intrinsic viscosity is lower than this, the strength is lowered, which is not preferable.

  The production method of the polyester block copolymer used in the present embodiment is to produce a polymer constituting the soft segment and the hard segment, respectively, and melt-mix them so that the melting point is lower than that of the polyester constituting the hard segment. A method is mentioned. Since this melting point varies depending on the mixing temperature and time, it is preferable to deactivate the catalyst by adding a catalyst deactivator such as phosphoric acid when the target melting point is reached.

<Hydrolysis inhibitor>
The polyester resin composition used for the insulator outer layer 3 includes a hydrolysis inhibitor.
Suitable hydrolysis inhibitors used in the embodiments of the present invention include compounds having a carbodiimide skeleton such as dicyclohexylcarbodiimide, diisopropylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride. However, it is not particularly limited.

  The addition amount of the hydrolysis inhibitor is 0.5 to 5 parts by mass, preferably 0.5 to 4 parts by mass, more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the base polymer. More preferably, it is 0.5-2 mass parts. This is because when the amount is less than 0.5 parts by mass, the hydrolysis resistance cannot be sufficiently exhibited, and when the amount added is more than 5 parts by mass, low toxicity cannot be achieved.

<Inorganic porous filler>
The polyester resin composition used for the insulator outer layer 3 includes an inorganic porous filler. The reason for adding the inorganic porous filler is to further improve the electrical characteristics of the insulator outer layer 3.

  The addition amount of the inorganic porous filler is 0.5 to 5 parts by mass, preferably 0.5 to 3 parts by mass, more preferably 0.5 to 2 parts by mass with respect to 100 parts by mass of the base polymer. More preferably, it is 0.5 to 1 part by mass. If the content is too small, ions cannot be trapped sufficiently, the insulation resistance becomes small, and the electrical characteristics are inferior. On the other hand, if the content is too large, the wear resistance is undesirably lowered.

The inorganic porous filler used in the embodiment of the present invention preferably has a specific surface area of 5 m ² / g or more.

  The inorganic porous filler is preferably calcined clay, but is not limited thereto, and may be zeolite, mesalite, anthracite, pearlite foam, activated carbon, or may be surface treated with silane, fatty acid, or the like.

<Magnesium hydroxide>
The polyester resin composition used for the insulator outer layer 3 contains magnesium hydroxide. The reason for adding magnesium hydroxide is to improve flame retardancy and to provide low smoke generation.

  The addition amount of magnesium hydroxide needs to be added in the range of 10 to 30 parts by mass with respect to 100 parts by mass of the base polymer. When the addition amount is less than 10 parts by mass, low smoke generation cannot be sufficiently exhibited, and when the addition amount is more than 30 parts by mass, flexibility and wear resistance are reduced when the wire is processed.

  Magnesium hydroxide used in the embodiment of the present invention is not particularly limited, and fatty acid, fatty acid metal salt, vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane, methacryloxypropyltriethoxy. Surface treatment may be performed with silane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, or the like, or an untreated product may be used.

  As a method of blending the above-mentioned various components into the resin composition used for the insulator inner layer 2 and the insulator outer layer 3, it can be performed by a known means at an arbitrary stage until immediately before the coating step. As the simplest method, high-density polyethylene, ethylene copolymer, metal harm prevention agent and the like are pelletized by melt mixing extrusion, base polymer and polyester block copolymer mainly composed of polybutylene naphthalate, A method in which a hydrolyzable inhibitor, an inorganic porous filler, magnesium hydroxide and the like are pelletized by melt mixing extrusion is employed.

  The resin composition used for the insulator inner layer 2 and the insulator outer layer 3 includes pigments, dyes, fillers, nucleating agents, mold release agents, antioxidants, stabilizers, antistatic agents as long as the effects of the present invention are exhibited. Agents, lubricants and other known additives can be blended and kneaded.

  It is desirable that the insulation thickness of the insulated wire having a two-layer structure (insulator inner layer 2 and insulator outer layer 3) is 0.1 to 0.5 mm, and the insulator layer 2 has a thickness of 0. 0.05 to 0.2 mm is preferable, and the thickness of the insulator outer layer 3 is preferably 0.05 to 0.3 mm.

  In addition, the multilayer insulated wire 10 according to the embodiment of the present invention is not limited to two layers as long as the insulator inner layer 2 and the insulator outer layer 3 are provided. An insulating layer may be interposed between the insulating layer 2 and the insulating layer 2, and an intermediate layer may be provided between the insulating layer 2 and the insulating outer layer 3.

[Effect of the embodiment of the present invention]
According to the embodiment of the present invention, it is possible to provide a method for producing a halogen-free multilayer insulated wire that has excellent appearance and enables long work while using polybutylene naphthalate as an insulating coating material. Moreover, the manufacturing method of the halogen-free multilayer insulated wire which is excellent in the tensile elongation characteristic compared with the above-mentioned patent documents 2 and 3 can be provided.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited only to these examples.

  The multilayer insulated wire which concerns on Examples 1-2 and the comparative example 1 was produced as follows.

  First, it mixed by the compounding composition shown in Table 1, and obtained the resin composition A used for the insulator layer 2 of the multilayer insulated wire 10, and the resin composition B used for the insulator outer layer 3. FIG.

[Materials used]
HDPE (High Density Polyethylene): Prime Polymer Co., Ltd., Hi-Zex 550P (Hi-Zex is a registered trademark)
-EEA (ethylene ethyl acrylate copolymer): manufactured by Nippon Polyethylene Corporation, Lexpearl EEA A1150 (Lexpearl is a registered trademark) (ethyl acrylate content: 15% by mass)
* TMPTMA (trimethylolpropane trimethacrylate): Shin Nakamura Chemical Co., Ltd., NK Ester TMPT (H-200)
Metal damage inhibitor (copper damage inhibitor, 1,2-bis [3- (4-hydroxy-3,5-di-tert-butylphenyl) propionyl)] hydrazine): Ciba Japan Co., Ltd., IRGANOX MD1024 (IRGANOX is a registered trademark)
-Antioxidant: ADEKA Co., Ltd., ADK STAB AO-18 (ADK STAB is a registered trademark)
・ PBN (polybutylene naphthalate resin): TQB-OT, manufactured by Teijin Chemicals Limited
-PEBC (polyester block copolymer): manufactured by Teijin Chemicals Ltd., Nouvelan TRB-EL2 (Nouvelan is a registered trademark)
・ Hydrolysis inhibitor: (Polycarbodiimide) Nisshinbo Co., Ltd., Carbodilite HMV-8CA (Carbodilite is a registered trademark)
・ Sintered clay: (Sintered calcined kaolin) manufactured by Engelhard, SATINTONE SP-33 (SATINTONE is a registered trademark)
Magnesium hydroxide: manufactured by Kyowa Chemical Industry Co., Ltd., Kisuma 5L (Kisuma is a registered trademark)

[Manufacture of multilayer insulated wires]
Regarding the obtained resin composition A and resin composition B, the resin composition A was dried at 80 ° C. for 8 hours or longer, the resin composition B was dried at 120 ° C. for 8 hours or longer in a hot air thermostatic bath, and then the diameter was about 0.00. The resin composition A is directly extruded on a 9 mm tin-plated annealed copper wire with a coating thickness of 0.10 mm, and the resin composition B is extruded on the outer periphery with a coating thickness of 0.15 mm. An electric wire was produced. For extrusion molding, dies and nipples having a diameter of 4.2 mm and 2.0 mm were used, respectively. The extrusion temperature of the resin composition A was 290 ° C. for the cylinder portion and 290 ° C. for the head portion. The temperature was 290 ° C. for the cylinder part and 290 ° C. for the head part. The take-up speed was 10 m / min. Furthermore, the multilayer insulated wire was irradiated and crosslinked to obtain a finished product. A multilayer insulated wire of a comparative example was produced in the same manner as in the example except that the resin composition B was directly extruded on a tin-plated annealed copper wire without using the resin composition A.

  The appearance was evaluated as follows.

[Evaluation of appearance]
About the produced multilayer insulated wire, it was confirmed visually that there was no convex part on the surface. The thing without a convex part was made into the pass (good appearance), and the thing with even one convex part was made into the rejection (good appearance defect).

  About Examples 1-2, it turns out that it is a pass (good appearance is good) and is excellent in long workability | operativity.

  On the other hand, it can be seen that Comparative Example 1 is often rejected (appearance defect) and is not suitable for long work.

  The embodiments of the present invention are not limited to the above-described embodiments, and various embodiments are possible. In addition, it is possible to omit some of the constituent elements of the above-described embodiment, and to add or change without departing from the scope of the present invention.

10: multilayer insulated wire, 1: conductor, 2: insulator layer, 3: insulator outer layer

Claims (3)

On the conductor, a process of extrusion coating a polyolefin resin composition containing 50 to 95 parts by mass of high-density polyethylene and 5 to 50 parts by mass of an ethylene copolymer at a temperature higher than 280 ° C. to provide an insulator layer;
A base polymer mainly composed of polybutylene naphthalate is included outside the insulator layer, and 50 to 150 parts by mass of a polyester block copolymer, 100 parts by mass of the hydrolysis inhibitor, and 0.1. Insulator outer layer by extrusion coating a polyester resin composition containing 5 to 5 parts by mass, inorganic porous filler 0.5 to 5 parts by mass, and magnesium hydroxide 10 to 30 parts by mass at a temperature higher than 280 ° C. And a step of providing a non-halogen multilayer insulated wire.   The method for producing a halogen-free multilayer insulated wire according to claim 1, wherein the temperature of the extrusion coating in the step of providing the insulator layer and the step of providing the insulator outer layer is in the range of 285 to 320 ° C. The method for producing a halogen-free multilayer insulated wire according to claim 1 or 2, wherein the step of providing the insulator layer and the step of providing the insulator outer layer are performed simultaneously.

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