JP2017066345A - Non-halogen flame retardant resin composition and insulated wire and cable using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-halogen flame retardant resin composition obtained by effectively using a biomass material and excellent in flame retardancy and mechanical strength, and an insulated wire and cable using the same as a coating material for a conductor.SOLUTION: The non-halogen flame retardant resin composition containing a polyolefin resin (A) and a flame retardant (B) is provided which contains 30 pts.mass or more of the flame retardant (B) based on 100 pts.mass of the (A) polyolefin resin, the polyolefin resin (A) containing a biomass resin derived from biomass, and the non-halogen flame retardant resin composition containing 45 mass% or more of the biomass resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a halogen-free flame retardant resin composition, and more particularly, to a halogen-free flame retardant resin composition suitable as a coating material for an insulator or sheath of electric wires and cables, and the halogen-free flame retardant resin composition. Related to insulated wires and cables.

  In recent years, biomass materials have attracted attention for their efforts to address global environmental issues. Biomass material is derived from organisms such as plants, and its carbon source uses carbon dioxide in the atmosphere, so it can be said that it is environmentally friendly from the viewpoint of carbon neutrality.

  In the technical field of electric wires and cables, there is a high interest in environmental issues. For example, in an insulated wire including a conductor and an insulator covering the outer periphery of the conductor, the insulator contains a biomass material and a vinyl chloride resin. Techniques for forming from a resin composition are disclosed (for example, Patent Documents 1 and 2).

  In addition, non-halogen flame retardant resin compositions that do not generate harmful gases during combustion are frequently used. For example, (A) 40-80 parts by mass of an ethylene-vinyl acetate copolymer, (B ) 60 to 20 parts by mass of an ethylene-ethyl acrylate copolymer having a melting point of 100 ° C. or higher, and (C) a metal hydroxide comprising 20 to 300 parts by mass with respect to a total of 100 parts by mass of (A) and (B). A non-halogen flame retardant resin composition in which the ethylene-vinyl acetate copolymer (A) is silane-crosslinked is disclosed, and an electric wire / cable using the non-halogen flame retardant resin composition for an insulator or a sheath is disclosed. It has been proposed (for example, Patent Document 3).

JP 2012-99380 A JP 2012-182034 A JP2011-1495A

In the techniques described in Patent Documents 1 and 2, since a halogen-containing resin called vinyl chloride resin is used, for example, when a fire occurs in a building, a power plant, various plants, etc. There is a risk of generating halogen gas that causes corrosion.
Moreover, in the technique described in Patent Document 3, it is necessary to mix a relatively large amount of metal hydroxide, which increases the density of electric wires and cables, increases the cost during transportation, and increases tensile strength and elongation. There is a problem that the mechanical strength is reduced.

  Accordingly, an object of the present invention is to provide a halogen-free flame retardant resin composition that effectively uses a biomass material and is excellent in flame retardancy and mechanical strength, and an electric wire / cable using the same as a coating material for a conductor. It is in.

  As a result of intensive research, the present inventors have used a biomass-derived biomass resin in a specific amount or more as a base resin, and a non-halogen flame-retardant resin composition having a specific amount of flame retardant solves the above problem. As a result, the present invention has been completed.

That is, the present invention is as follows (1) to (7).
(1) A non-halogen flame retardant resin composition containing (A) a polyolefin-based resin and (B) a flame retardant, wherein the (A) polyolefin-based resin contains a biomass-derived biomass resin, 45% by mass or more in the non-halogen flame retardant resin composition, and 30 parts by mass or more of the (B) flame retardant with respect to 100 parts by mass of the (A) polyolefin resin. Resin composition.
(2) The biomass resin has a density of 0.915 to 0.950 g / cm ³ and a melt flow rate (MFR) measured under conditions of 190 ° C. and 2.16 kg load in accordance with JIS K7210 is 0.00. The non-halogen flame retardant resin composition as described in (1) above, which is 2 to 10.0 g / 10 min.
(3) The non-halogen flame retardant resin composition according to (1) or (2), wherein the biomass resin is a biomass-derived polyolefin resin.
(4) The polyolefin resin is at least one selected from the group consisting of polyethylene, polypropylene, ethylene-ethyl acrylate copolymer resin, and ethylene-vinyl acetate copolymer resin. Non-halogen flame retardant resin composition.
(5) The non-halogen according to any one of (1) to (4), wherein the flame retardant (B) contains at least one of a phosphorus flame retardant and a nitrogen flame retardant. Flame retardant resin composition.
(6) An insulated electric wire / cable comprising a conductor and a coating layer covering the conductor, wherein the coating layer is composed of at least one layer, and at least the outermost layer of the coating layer is the one described in (1) to (5). An insulated wire / cable characterized by being formed of any one of the non-halogen flame-retardant resin compositions.
(7) The insulated wire / cable according to (6), wherein the density of the outermost layer is 1.10 g / cm ³ or less.

In the non-halogen flame retardant resin composition of the present invention, the base resin (A) polyolefin-based resin contains a biomass-derived biomass resin, and the biomass resin is contained in an amount of 45% by mass or more in the composition. Moreover, since the composition and blending amount of the flame retardant are specified, the flame retardancy and mechanical strength are excellent.
Therefore, the insulated wire / cable using the halogen-free flame retardant resin composition of the present invention is excellent in environmental aspects, and is excellent in flame retardancy and mechanical strength.

FIG. 1 is a schematic cross-sectional view of an insulated wire according to an embodiment of the present invention. 2 (a) and 2 (b) are schematic cross-sectional views of an insulated cable according to an embodiment of the present invention.

  Hereinafter, the non-halogen flame retardant resin composition of the present invention and the insulated wire / cable using the same will be described in more detail.

[Non-halogen flame retardant resin composition]
The non-halogen flame retardant resin composition of the present invention contains (A) a polyolefin resin and (B) a flame retardant.
Hereinafter, each component will be described.

  (A) Polyolefin resin is used as the base resin of the non-halogen flame retardant resin composition of the present invention. The polyolefin resin is not particularly limited as long as it does not contain halogen. For example, high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (L- LDPE), polyethylene (PE) such as very low density polyethylene (V-LDPE), polypropylene (PP), ethylene-propylene copolymer (EPR), ethylene-methyl acrylate copolymer (EMA), and the like. These (A) polyolefin resin may be used individually by 1 type, and 2 or more types may be mixed and used for it.

In the present invention, the (A) polyolefin-based resin contains a biomass-derived biomass resin. By including the biomass resin, an environment-friendly resin composition can be obtained.
The biomass resin is preferably a biomass-derived polyolefin resin. Such polyolefin resins are known, for example, using plant-derived ethylene or alcohol derived from a fermented sugar extracted from plant raw materials such as sugarcane and corn or ethyl alcohol obtained from a cellulose fermented product through an alcohol dehydration reaction. Examples include polyethylene and polypropylene produced by producing propylene and using this as a starting material.
From the viewpoint of improving the effect of the present invention, the polyolefin-derived polyolefin resin is preferably at least one selected from the group consisting of polyethylene, polypropylene, ethylene-ethyl acrylate copolymer resin, and ethylene-vinyl acetate copolymer resin. . As such polyethylene, commercially available ones can be used. For example, various polyethylene resins belonging to Green polyethylene manufactured by Braskem, specifically, trade names SLH118, SBC818, SHE150, SHA7260, SGF4960, etc. Can be mentioned.

Moreover, it is preferable that the density of biomass-derived biomass resin is 0.915-0.950 g / cm < ³ > from the reason for raising the flame retardance and mechanical strength of a non-halogen flame retardant resin composition. In addition, the density as used in the field of this invention is a value measured based on JISK7112 (1992). When the density of the biomass resin is less than 0.915 g / cm ^3, it is not preferable because the tensile strength sufficient for the electric wire application cannot be maintained, and when it exceeds 0.950 g / cm ³ , the tensile elongation sufficient for the electric wire application is insufficient. This is not preferable because it cannot be held. Therefore, in this invention, it is preferable that the density of biomass resin is 0.915-0.950g / cm < ³ >.

  Furthermore, because of increasing the flame retardancy and mechanical strength of the non-halogen flame retardant resin composition, a biomass-derived biomass resin was measured under conditions of 190 ° C. and 2.16 kg load according to JIS K7210. The flow rate (MFR) is preferably 0.2 to 10.0 g / 10 min. If the MFR of the biomass resin is less than 0.2 g / 10 min, the load at the time of wire extrusion becomes high, which is not preferable, and if it exceeds 10.0 g / 10 min, the appearance of the wire may be remarkably impaired. Therefore, in this invention, it is preferable that MFR of biomass resin is 0.2-1.0 g / 10min.

In this invention, 45 mass% or more of said biomass-derived biomass resins are contained in a non-halogen flame-retardant resin composition. When the content of the biomass resin in the composition is 45% by mass or more, a resin composition that does not adversely affect the environment can be obtained. The biomass resin is preferably 50% by mass or more, more preferably 70% by mass or more, and still more preferably 95% by mass or more in the halogen-free flame retardant resin composition.
Further, the proportion of the biomass resin in the (A) polyolefin-based resin is preferably 65% by mass or more, more preferably 80% by mass or more, and (A) the polyolefin-based resin is more preferably a biomass resin.

Although it does not restrict | limit especially as a flame retardant (B) which can be used by this invention, A phosphorus flame retardant, a nitrogen flame retardant, etc. are mentioned.
Examples of the phosphorus flame retardant include polyphosphate compounds such as melamine polyphosphate, aromatic phosphate esters, and aromatic condensed phosphate esters. Specifically, examples of the phosphoric flame retardant include melamine phosphate, melamine polyphosphate, guanidine phosphate, guanidine polyphosphate, ammonium phosphate, ammonium polyphosphate, ammonium amidophosphate, ammonium polyphosphate, and carbamate phosphate. , Phosphate compounds such as polyphosphate carbamate and polyphosphate compounds, red phosphorus, organic phosphate ester compounds, phosphazene compounds, phosphonic acid compounds, phosphinic acid compounds, phosphine oxide compounds, phosphorane compounds, phosphoramide compounds, etc. can do.

  Examples of nitrogen flame retardants include melamine compounds such as melamine cyanurate, triazine compounds, and guanidine compounds. Specifically, as nitrogen-based flame retardants, triazine compounds such as melamine, melam, melem, melon, melamine cyanurate, cyanuric acid compounds, isocyanuric acid compounds, triazole compounds, tetrazole compounds, diazo compounds, urea, etc. are used. can do.

  These (B) flame retardants may be used individually by 1 type, and 2 or more types may be mixed and used for them. (B) When two or more flame retardants are used in combination, the amount of flame retardant used is reduced due to the synergistic effect of the flame retardant, and when used as a coating material for wires and cables, it is difficult enough for wires and cables. Flammability can be imparted.

  In the present invention, the flame retardant (B) is preferably used in combination of a phosphorus flame retardant and a nitrogen flame retardant.

  In the present invention, from the viewpoint of reducing the density of the non-halogen flame retardant resin composition, reducing the transportation cost, and improving the handleability, it is preferable that (B) a metal hydroxide is not blended as much as possible. . Examples of the metal hydroxide include aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, calcium hydroxide, hydrotalcites and the like.

  In the non-halogen flame retardant resin composition of the present invention, the flame retardant (B) is contained in an amount of 30 parts by mass or more with respect to 100 parts by mass of the (A) polyolefin resin. (B) When the content of the flame retardant is 30 parts by mass or more, the non-halogen flame retardant resin composition can be provided with desired flame retardancy, and thus the non-halogen flame retardant resin composition of the present invention is coated. The insulated wire / cable used as the material can be reduced in weight, and the mechanical properties of the insulated wire / cable can be improved. (B) It is preferable that content of a flame retardant is 30-60 mass parts with respect to 100 mass parts of (A) polyolefin resin.

  The non-halogen flame retardant resin composition of the present invention may contain various known materials such as a foaming agent, an antioxidant, a processing aid, an ultraviolet absorber, a colorant, an antistatic agent, a dispersant, and other lubricants as necessary. Additives can also be blended.

  As the foaming agent, a known chemical decomposition foaming agent that generates carbon dioxide gas, nitrogen gas, or the like by chemical decomposition can be used. For example, an azo compound such as azodicarbonamide (ADCA), NN′— Examples thereof include nitroso compounds such as dinitrosopentamethylenetetramine, hydrazine derivatives such as 4,4′-oxybis (benzenesulfonylhydrazide) (OBSH) and hydrazodicarbonamide (HDCA), and sodium bicarbonate.

  Examples of the antioxidant include a phenolic antioxidant, an amine antioxidant, and a phosphorus antioxidant.

  Examples of processing aids include petroleum oils such as paraffinic oils, aromatic oils, and naphthenic oils that are added to resin materials and the like.

  Examples of the ultraviolet absorber include benzophenone compounds, benzotriazole compounds, salicylate compounds, substituted tolyl compounds, metal chelate compounds, and the like.

  As the colorant, general inorganic pigments and organic pigments described in “Handbook of Pigments (edited by Japan Pigment Technical Association)” can be used. Examples of inorganic pigments include (complex) metal oxides containing titanium such as titanium yellow, zinc oxide, iron oxide, zinc sulfide, and antimony trioxide. Examples of the organic pigment include phthalocyanine, anthraquinone, quinacridone, azo, isoindolinone, quinophthalone, perinone, and perylene pigments.

  Examples of the antistatic agent include alkyl phosphate esters and silicate compounds.

  Examples of the dispersant include acrylic dispersants, fatty acid ester dispersants, polyethylene glycol dispersants, nonionic surfactants, amphiphilic triphenylene derivatives, and pyrene derivatives.

  Examples of other lubricants include hydrocarbon lubricants, fatty acid lubricants, ester lubricants, and the like.

  Moreover, when using the halogen-free flame-retardant resin composition of this invention for the coating layer of an electric wire and a cable, you may mix | blend a silane coupling agent, a crosslinking agent, and a crosslinking catalyst. Specifically, it is preferable to introduce a silane coupling agent into a polyolefin resin (A) using a crosslinking agent and then silane-crosslink the (A) polyolefin resin using a crosslinking catalyst. More specifically, it is preferable to form a cross-linked structure by grafting a silane coupling agent to the main chain of the (A) polyolefin resin and then condensing the silane coupling agent. Thus, by producing a siloxane bond as a crosslinked structure, durability can be imparted without impairing the flexibility of the (A) polyolefin resin.

  Examples of the silane coupling agent include vinyl silane compounds such as vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tris (β-methoxy ethoxy) silane, γ-aminopropyl trimethoxy silane, γ-aminopropyl triethoxy silane, N-β- Aminosilane compounds such as (aminoethyl) γ-aminopropyltrimethoxysilane, β- (aminoethyl) γ-aminopropylmethyldimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, β- (3,4 epoxy cyclohexyl) ) Epoxy silane compounds such as ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, acrylic silane compounds such as γ-methacryloxypropyltrimethoxysilane, bis Polysulfide silane compounds such as 3- (triethoxysilyl) propyl) disulfide and bis (3- (triethoxysilyl) propyl) tetrasulfide, mercaptosilane compounds such as 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane Etc. However, the silane coupling agent is not limited to these. Moreover, these can be used 1 type or in combination of 2 or more types. Furthermore, it is preferable that the mixture ratio of a silane coupling agent is 1.0-2.0 mass parts with respect to 100 mass parts of (A) polyolefin resin.

  Examples of the crosslinking agent (radical generator) include organic peroxides, but are not limited thereto. Specifically, as the crosslinking agent, dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di- (tert-butylperoxy) hexane, 2,5-dimethyl- 2,5-di- (tert-butylperoxy) hexyne-3, 1,3-bis (tert-butylperoxyisopropyl) benzene, 1,1-bis (tert-butylperoxy) -3,3,5 -Trimethylcyclohexane, n-butyl-4,4-bis (tert-butylperoxy) valerate, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butylperoxybenzoate, tert-butylperoxyisopropyl carbonate, Diacetyl peroxide, lauroyl peroxide, tert- Chill cumyl peroxide, and the like. Moreover, these can be used 1 type or in combination of 2 or more types. Furthermore, it is preferable that the mixture ratio of a crosslinking agent is 0.05-0.10 mass part with respect to 100 mass parts of (A) polyolefin resin.

  Examples of the crosslinking catalyst include, but are not limited to, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dioctate, stannous acetate, stannous caprylate, zinc caprylate, lead naphthenate, and cobalt naphthenate. It is not a thing. Furthermore, the blending ratio of the crosslinking catalyst is preferably 0.1 to 0.2 parts by mass with respect to 100 parts by mass of the (A) polyolefin resin in the case of dibutyltin dilaurate.

  The non-halogen flame retardant resin composition of the present invention can be prepared according to a known method. For example, after pre-blending using a high-speed mixing device such as a Henschel mixer, it is kneaded using a known kneader such as a Banbury mixer, a kneader, or a roll mill.

  In addition, when forming silane bridge | crosslinking, a silane coupling agent is first made to graft-react with (A) polyolefin resin using a crosslinking agent. Next, silane crosslinking can be formed by kneading the (A) polyolefin resin into which the silane coupling agent is introduced and the crosslinking catalyst. In this case, the flame retardant (B) may be added before the silane crosslinking is formed, or may be added after the formation.

The mechanical properties of the halogen-free flame retardant resin composition of the present invention are as follows: density is 1.000 g / cm ³ or less (based on JIS K7112 (1999)), tensile strength is 10 MPa or more (based on JIS C3005 (2014)), The tensile elongation is preferably 350% or more (based on JIS C3005 (2014)). The non-halogen flame retardant resin composition preferably has a hardness of HDD55 or less (based on JIS K7215). By satisfying such mechanical properties and flexibility, it is possible to ensure insulation for a long period of time when used as an insulator or sheath for electric wires and cables.
The flame retardancy of the non-halogen flame retardant resin composition of the present invention preferably has flame extinguishing properties within 60 seconds based on a combustion test based on JIS C3005 (4.26). For the slipperiness, the static friction coefficient is preferably 0.7 or less (according to ASTM D1894). By satisfying such flame retardancy and slipperiness, workability can be improved while maintaining flame resistance even when used as an insulator or sheath for electric wires and cables.

[Insulated wire / cable]
By using the non-halogen flame retardant resin composition of the present invention as a covering material for conductors such as insulators and sheaths, an insulated wire / cable excellent in heat resistance and slipperiness can be obtained.
The insulated wire / cable of the present invention includes a conductor and a coating layer covering the conductor, and the coating layer is formed by the non-halogen flame retardant resin composition of the present invention. The coating layer is composed of at least one layer, and at least the outermost layer of the coating layer is formed by the non-halogen flame retardant resin composition of the present invention.

FIG. 1 is a schematic cross-sectional view of an insulated wire according to an embodiment of the present invention, and FIGS. 2A and 2B are schematic cross-sectional views of an insulated cable according to an embodiment of the present invention.
As shown in FIG. 1, an insulated wire (hereinafter simply referred to as “wire”) 1 in the present embodiment includes a conductor 10 and an insulator 11 as a coating layer 5 that covers the periphery of the conductor 10. In addition, as shown in FIG. 2A, an insulated cable (hereinafter simply referred to as “cable”) 2 in the present embodiment includes a plurality of bundled electric wires 1 (1a, 1b, 1c) and a plurality of bundled bundles. And a sheath 21 as a coating layer 5 covering the periphery of the electric wire 1. In addition, the cable 2 does not necessarily have to bundle a plurality of electric wires 1, and as shown in FIG. 2 (b), the periphery of the conductor 10 is covered with a covering layer 5 made of an insulator 11 and a sheath 21. Also good.

  The conductor 10 may be only one strand or may be formed by bundling a plurality of strands. As a material of the conductor 10, for example, a conductive metal such as copper, plated copper, copper alloy, aluminum, and aluminum alloy can be used.

  In the present invention, the coating layer 5 comprises at least one layer, and at least the outermost layer of the coating layer 5 is formed from the non-halogen flame retardant resin composition of the present invention. That is, in FIG. 1, the insulator 11 is formed from the non-halogen flame retardant resin composition of the present invention, and in FIGS. 2 (a) and 2 (b), at least the sheath 21 is the non-halogen flame retardant of the present invention. It is formed from a resin composition. Note that the insulator 11 in FIGS. 2A and 2B may also be formed from the non-halogen flame-retardant resin composition of the present invention.

In the electric wire 1 and the cable 2 of the present invention, the density of the insulator 11 and the sheath 21 formed of the non-halogen flame retardant resin composition of the present invention is preferably 1.10 g / cm ³ or less. According to such a density, weight reduction of the electric wire 1 or the cable 2 is achieved, and conveyance cost and handling property can be improved. In addition, this density can be adjusted with the kind of base polymer, a flame retardant, the kind of another compound, and the number of compounding parts.

The production method of the electric wire / cable can be performed according to a known method, and for example, a general extrusion molding method can be adopted.
For example, the insulator 11 is formed by extrusion-coating the non-halogen flame retardant resin composition of the present invention on an element wire such as copper constituting the conductor 10 by an extruder such as a single screw extruder or a twin screw extruder. Thus, the electric wire 1 is obtained. The cable 2 is obtained by bundling one or a plurality of the electric wires 1 obtained in this way and forming the sheath 21 by extrusion coating the non-halogen flame retardant resin composition of the present invention on the outside thereof. .

  EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not restrict | limited to the following example. It should be noted that simply “parts” means parts by mass.

Each component used for the Example and the comparative example is as follows.
<Biomass resin>
A1: Polyethylene (PE), “SLH118” manufactured by Braskem (trade name, density 0.916 g / cm ³ , MFR 1.0)
A2: Polyethylene (PE), “SBC818” manufactured by Braskem (trade name, density 0.918 g / cm ³ , MFR 8.1)
A3: Polyethylene (PE), “SHE150” manufactured by Braskem (trade name, density 0.948 g / cm ³ , MFR 1.0)
A4: Polyethylene (PE), “SHA7260” manufactured by Braskem (trade name, density 0.92 g / cm ³ , MFR 22.0)
A5: Polyethylene (PE), “SGF4960” manufactured by Braskem (trade name, density 0.961 g / cm ³ , MFR 0.3)

<Non-biomass resin>
B1: Polyethylene (PE), “LF640MA” manufactured by JPE (trade name, density: 0.924 g / cm ³ , MFR 5.0)
B2: Polyethylene (PE), “KF270” (trade name, density 0.907 g / cm ³ , MFR 2.0) manufactured by Nippon Polyethylene Co., Ltd.
B3: Ethylene-vinyl acetate copolymer (EVA), “V215” manufactured by Ube Maruzen Polyethylene Co., Ltd. (trade name, density 0.940 g / cm ³ , MFR 2.0)

<Silane coupling agent>
C1: Vinyltriethoxysilane, “KBA-1003” (trade name) manufactured by Shin-Etsu Silicone Co., Ltd.
<Crosslinking agent>
D1: Organic peroxide, Mitsui Chemicals Fine Co., Ltd. “DCP” (trade name)
<Crosslinking catalyst>
E1: Dibutyltin dilaurate, “L-101” (trade name) manufactured by Tokyo Fine Chemical Co., Ltd.
<Flame Retardant>
G1: Melamine polyphosphate, “Melapur200” (trade name) manufactured by BASF
G2: Melamine cyanurate, “STABIACE MC-5S” (trade name) manufactured by Sakai Chemical Industry Co., Ltd.
G3: Magnesium hydroxide, “Maglux ST” (trade name), manufactured by Shin Mining Co., Ltd.

<Test Example 1>
(Examples 1-10 and Comparative Examples 1-3)
According to the blending amount (parts by mass) shown in Table 1, each component was kneaded with a kneader having a temperature of 140 ° C. to prepare a non-halogen flame retardant resin composition.
Subsequently, each non-halogen flame retardant resin composition is formed on a copper wire having a diameter of 2.0 mm by using an extruder (HAAKE “polylab system” (trade name)) so that the thickness of the insulator becomes 0.8 mm. A test wire was formed by forming.
The following evaluation is performed for each insulator and test wire, and the results are shown in Table 1.

(Tensile elongation / tensile strength of insulator)
The tensile elongation of the insulator was measured in accordance with JIS C3005 (2014). A sample having a tensile elongation of 350% or more was evaluated as “◯”, and a sample having a tensile elongation of less than 350% was evaluated as “X”.
The tensile strength of the insulator was measured according to JIS C3005 (2014). Those having a tensile strength of 20 MPa or more were evaluated as “◎”, those having a tensile strength of 10 MPa or more and less than 20 MPa were evaluated as “◯”, and those having a tensile strength of less than 10 MPa were evaluated as “X”.

(Insulator density)
The density of the insulator was measured according to JIS K7112 (1992). Those having a density of 1.10 g / cm ³ or less were evaluated as “◯” and those having a density exceeding 1.10 g / cm ³ were evaluated as “x”.

(Flame retardance)
In accordance with JIS C3005 (2014), the test wire was subjected to a combustion test. After ignition, the case where the fire went out naturally within 60 seconds was evaluated as “◯”, and the case where the fire did not go out after 60 seconds was evaluated as “X”.

From the results of Table 1, it was found that the insulators formed from the non-halogen flame retardant resin compositions prepared in Examples 1 to 10 are advantageous in terms of the global environment and excellent in flame retardancy and mechanical strength. . In addition, since the density of the insulator is low, the transportation cost can be reduced and the handleability is excellent.
On the other hand, Comparative Examples 1 and 2 were inferior in flame retardancy. Moreover, the comparative example 3 had little content of biomass resin, and was not able to satisfy mechanical strength and a low density simultaneously.

<Test Example 2>
(Examples 11 to 21 and Comparative Examples 4 to 8)
According to the blending amount (part by mass) shown in Table 2, each component was kneaded with a kneader having a temperature of 140 ° C. to prepare a non-halogen flame retardant resin composition.
Subsequently, the resin composition for insulator prepared by prepreg treatment using “FM 10C / I type mixer” (trade name) manufactured by Nippon Coke Industries Co., Ltd. is 0.8 mm thick on a copper wire having a diameter of 2.0 mm. A test cable having an insulator formed thereon and a sheath formed of a non-halogen flame retardant resin composition was prepared.
The following evaluation was performed on each insulator, sheath, and test cable, and the results are shown in Table 2.

(Tensile elongation / tensile strength of insulator)
The tensile elongation of the insulator was measured according to JIS C3005 (4.16). Those having a tensile elongation of 200% or more were evaluated as “◯”, and those having a tensile elongation of less than 200% were evaluated as “x”.
The tensile strength of the insulator was measured according to JIS C3005 (4.16). Those having a tensile strength of 10 MPa or more were evaluated as “◯”, and those having a tensile strength of less than 10 MPa were evaluated as “x”.

(Heat deformation degree of insulator)
According to JIS C3005 (4.23), the heating temperature was set to 120 ° C., and the degree of heat deformation of the insulator was measured. Those having a heat deformation degree of 40% or less were evaluated as “◯”, and those exceeding 40% were evaluated as “X”.

(Tensile elongation / tensile strength of sheath)
The tensile elongation of the sheath was measured according to JIS C3005 (4.16). A sample having a tensile elongation of 350% or more was evaluated as “◯”, and a sample having a tensile elongation of less than 350% was evaluated as “X”.
The tensile strength of the sheath was measured according to JIS C3005 (4.16). Those having a tensile strength of 20 MPa or more were evaluated as “◎”, those having a tensile strength of 10 MPa or more and less than 20 MPa were evaluated as “◯”, and those having a tensile strength of less than 10 MPa were evaluated as “X”.

(Sheath density)
The density of the sheath was measured according to JIS K7112 (5.1). Those having a density of 1.10 g / cm ³ or less were evaluated as “◯” and those having a density exceeding 1.10 g / cm ³ were evaluated as “x”.

(Flame retardance)
According to JIS C3005 (4.26), the test cable was subjected to a combustion test. After ignition, the case where the fire went out naturally within 60 seconds was evaluated as “◯”, and the case where the fire did not go out after 60 seconds was evaluated as “X”.

From the results in Table 2, it was found that the sheath formed from the non-halogen flame retardant resin composition produced in Examples 11 to 21 was advantageous in terms of the global environment and excellent in flame retardancy and mechanical strength. Moreover, since the density of a sheath is low, a conveyance cost can be reduced and it is excellent also in handleability.
In contrast, Comparative Examples 4 to 7 resulted in inferior flame retardancy. Moreover, the comparative example 8 had little content of biomass resin, and was not able to satisfy mechanical strength and a low density simultaneously.

1 Insulated wire (wire)
2 Insulated cable (cable)
5 Coating Layer 10 Conductor 11 Insulator 21 Sheath 1a, 1b, 1c Electric Wire

Claims (7)

A halogen-free flame retardant resin composition containing (A) a polyolefin-based resin and (B) a flame retardant,
The (A) polyolefin-based resin contains biomass-derived biomass resin, and the biomass resin is contained in an amount of 45% by mass or more in the non-halogen flame-retardant resin composition,
The halogen-free flame retardant resin composition comprising 30 parts by mass or more of the flame retardant (B) with respect to 100 parts by mass of the (A) polyolefin resin. The biomass resin has a density of 0.915 to 0.950 g / cm ³ and a melt flow rate (MFR) of 0.2 to 10 as measured under conditions of 190 ° C. and 2.16 kg load in accordance with JIS K7210. The non-halogen flame retardant resin composition according to claim 1, which is 0.0 g / 10 min.   The non-halogen flame retardant resin composition according to claim 1, wherein the biomass resin is a biomass-derived polyolefin resin.   The non-halogen flame retardant according to claim 3, wherein the polyolefin resin is at least one selected from the group consisting of polyethylene, polypropylene, ethylene-ethyl acrylate copolymer resin, and ethylene-vinyl acetate copolymer resin. Resin composition.   The non-halogen flame retardant resin composition according to any one of claims 1 to 4, wherein the flame retardant (B) contains at least one of a phosphorus flame retardant and a nitrogen flame retardant. . An insulated wire / cable comprising a conductor and a coating layer covering the conductor,
The insulated wire is characterized in that the coating layer comprises at least one layer, and at least the outermost layer of the coating layer is formed of the non-halogen flame retardant resin composition according to any one of claims 1 to 5. cable. The insulated wire / cable according to claim 6, wherein the density of the outermost layer is 1.10 g / cm ³ or less.

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