JP2010111760A - Non-halogen resin composition, non-halogen insulated electrical wire, and non-halogen cable - Google Patents

Abstract

Disclosed are a halogen-free resin composition that does not contain a metal hydroxide, a halogen-free insulated wire, and a halogen-free cable.
A non-halogen resin composition according to the present invention includes a polymer compound containing an olefinic hydrocarbon unit, a metal oxide mixed with the polymer compound, and an amount of the compound added to the polymer compound greater than the amount of the metal oxide added. And a metal salt that releases a noncombustible gas upon combustion, and the polymer compound does not contain a metal hydroxide.
[Selection] Figure 1

Description

  The present invention relates to a halogen-free resin composition, a halogen-free insulated wire, and a halogen-free cable. In particular, the present invention relates to a non-halogen resin composition that does not contain a metal hydroxide, a non-halogen insulated wire, and a non-halogen cable.

  Conventionally, as a flame retardant composition not containing a halogen compound, a composition in which a metal hydroxide such as magnesium hydroxide as a non-halogen flame retardant is added to a polyolefin resin is known, and the composition is coated. Insulated wires are known. For example, a conductor, an inner layer that covers the conductor, and an outer layer that covers the inner layer, the inner layer includes 40 to 90 parts by weight of an ethylene-based copolymer, 5 to 50 parts by weight of ethylene acrylic rubber, and an ionomer or ethylene- The outer layer is formed by blending 40 to 200 parts by weight of magnesium hydroxide and 1 to 20 parts by weight of a flame retardant aid with respect to 100 parts by weight of the base polymer comprising 0.5 to 50 parts by weight of the methacrylic acid copolymer. Is an insulated wire made of a resin composition containing 100 parts by weight of an ionomer or ethylene-methacrylic acid copolymer, 300 parts by weight or less of magnesium hydroxide, and 20 parts by weight or less of a flame retardant aid ( For example, see Patent Document 1).

  Since the insulated wire described in Patent Document 1 coats the conductor with an inner layer made of a resin composition excellent in flame retardancy and flexibility, the inner layer is covered with an outer layer excellent in trauma resistance. An insulated wire excellent in flame retardancy, cold resistance and mechanical properties can be provided.

JP 2003-132741 A

  However, since the insulated wire described in Patent Document 1 has a metal hydroxide added to the inner layer and the outer layer, increasing the amount of added metal hydroxide for the purpose of improving the flame retardancy, Mechanical properties such as elongation and tensile strength are significantly reduced. Moreover, since metal hydroxides, such as magnesium hydroxide, change and melt | dissolve in an acidic environment or an alkaline environment, the volume resistivity of the resin composition to which the metal hydroxide was added falls.

  Accordingly, an object of the present invention is to provide a halogen-free resin composition, a halogen-free insulated wire, and a halogen-free cable that do not contain a metal hydroxide.

  In order to achieve the above-mentioned object, the present invention is a polymer compound containing an olefinic hydrocarbon unit, a metal oxide mixed with the polymer compound, and a compound added to the polymer compound in an amount greater than the amount of metal oxide added, and combustion. A non-halogen resin composition comprising a metal salt that sometimes releases a noncombustible gas and the polymer compound does not contain a metal hydroxide is provided.

  In the non-halogen resin composition, the metal salt may be a metal normal carbonate, and the incombustible gas may be a carbon dioxide gas. The metal oxide may be selected from the group consisting of titanium oxide, zinc oxide, alumina, and magnesium oxide. The metal orthocarbonate may be selected from the group consisting of magnesium carbonate, calcium carbonate, dolomite, and huntite.

  The non-halogen resin composition is composed of a low-density polyethylene, a linear low-density polyethylene, a linear ultra-low-density polyethylene, a high-density polyethylene, a polypropylene, an ethylene-methyl methacrylate copolymer, an ethylene-methyl. Acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-butene copolymer, ethylene-propylene copolymer , Ethylene-styrene copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-isoprene block copolymer, styrene-ethylene-propylene-styrene block copolymer Coalescence, ethylene - propylene - diene terpolymer, and may be selected from the group consisting of maleic anhydride grafted low density polyethylene. Further, the polymer compound may be further mixed with a flame retardant which is a non-metal hydroxide.

  In order to achieve the above object, the present invention includes a conductor and an outer layer covering the conductor, and the outer layer is a polymer compound, a metal oxide mixed with the polymer compound, and the addition of the metal oxide. There is provided a non-halogen insulated electric wire formed from a non-halogen resin composition containing no metal hydroxide, and a metal salt that is mixed in a polymer compound in an amount larger than that and releases a non-combustible gas upon combustion.

  In order to achieve the above object, the present invention includes a conductor, an outer layer that covers the conductor, and a sheath that covers the outer layer, and the sheath includes a polymer compound and a metal oxide mixed with the polymer compound. A non-halogen cable formed from a non-halogen resin composition that does not contain a metal hydroxide, and a metal salt that is mixed with a polymer compound in an amount greater than the amount of metal oxide added and releases a non-flammable gas upon combustion. .

  The insulated wire according to the present invention can provide a non-halogen resin composition, a non-halogen insulated wire, and a non-halogen cable that do not contain a metal hydroxide.

[Embodiment]
The non-halogen resin composition according to the embodiment of the present invention includes a high molecular compound, a metal oxide mixed with the high molecular compound, and a higher amount of the metal oxide added to the high molecular compound, and a non-combustible gas during combustion. And a metal salt that releases. And the non-halogen resin composition which concerns on this Embodiment is formed without including a metal hydroxide. The term “mixing” refers to a state in which a plurality of compounds are dispersed almost uniformly. In addition, when the plurality of compounds exhibit compatibility with each other, not only the state in which the plurality of compounds are mixed together but also the case where the plurality of compounds are not compatible with each other It also includes a state in which they are dispersed almost uniformly.

(Polymer compound)
As the polymer compound according to this embodiment, a polymer compound containing an olefin hydrocarbon unit can be used. For example, the polymer compound includes polyethylene such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), linear very low density polyethylene (VLDPE), and high density polyethylene (HDPE), polypropylene, ethylene-methyl. Methacrylate copolymer (EMMA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl acrylate copolymer (EBA), ethylene-vinyl acetate copolymer (EVA) ), Ethylene-glycidyl methacrylate copolymer, ethylene-butene copolymer, ethylene-propylene copolymer (EPR), ethylene-styrene copolymer, styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene・ Butylene Styrene thermoplastic elastomers such as ren block copolymer (SEBS), styrene-isoprene block copolymer (SIS), styrene-ethylene-propylene-styrene block copolymer (SEPS), ethylene-propylene-diene ternary copolymer A polymer (EPDM), maleic acid grafted low density polyethylene, or the like can be used.

  Here, in order to improve the flame retardancy of the non-halogen resin composition, it is preferable to use a polymer compound containing an ethylene unit. In particular, ethylene-acrylate copolymer such as ethylene-methyl methacrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl acrylate copolymer (EBA), or ethylene-acetic acid It is preferable to use an ethylene copolymer such as a vinyl copolymer (EVA).

(Metal oxide)
When the non-halogen resin composition burns, the metal oxide according to the present embodiment exhibits a dehydrogenation catalytic action on the polymer compound and functions as a flame retardant. Specifically, zinc oxide, titanium oxide, alumina, or magnesium oxide can be used as the metal oxide. The metal oxide promotes carbonization of the polymer compound constituting the non-halogen resin composition by promoting the elimination of hydrogen from the polymer compound during combustion of the non-halogen resin composition. Thereby, a metal oxide forms the carbonized film from a high molecular compound in the surface and / or inside of a non-halogen resin composition, and provides a flame retardance to a non-halogen resin composition. As the metal oxide, a metal oxide having a primary particle diameter of 100 nm or less can be used. Alternatively, as the metal oxide, a metal oxide having a ratio between the length in the minor axis direction and the length in the major axis direction of the primary particles, that is, an aspect ratio of 7 or more can be used.

(Metal salt)
As the metal salt according to the present embodiment, for example, a metal orthocarbonate can be used. And in this Embodiment, the metal salt which discharge | releases an incombustible gas at the time of combustion is used. Here, for example, when a metal orthocarbonate is used as the metal salt, the incombustible gas released is carbon dioxide. When the non-halogen resin composition is burned, non-combustible gas (carbon dioxide gas) is released by decarbonization of the metal orthocarbonate, whereby flame resistance can be imparted to the non-halogen resin composition.

  Specifically, magnesium carbonate, calcium carbonate, dolomite, huntite and the like can be used as the metal normal carbonate. In the present embodiment, when a compound having a decarboxylation temperature close to the combustion temperature of the non-halogen resin composition is used, carbon dioxide is easily released from the metal orthocarbonate during the combustion of the non-halogen resin composition. As the metal normal carbonate, magnesium carbonate is preferably used. In addition, the metal orthocarbonate which has the decarboxylation temperature approximated to the said combustion temperature corresponding to the combustion temperature of a non-halogen resin composition can also be used. Further, as the metal normal carbonate, a metal normal carbonate having an average particle size of 5 μm or less can be used.

  In addition, as the metal carbonate, there are a metal basic carbonate containing a hydroxyl group and a metal normal carbonate containing no hydroxyl group, but the metal basic carbonate containing a hydroxyl group is inferior in water resistance. Is preferably a metal orthocarbonate containing no hydroxyl group.

(Flame retardants)
The non-halogen resin composition according to the present embodiment can be formed by further mixing a flame retardant that is a non-metal hydroxide. As this flame retardant, a melamine compound can be used. As the melamine compound, melamine, cyanuric acid, isocyanuric acid, melamine cyanurate, melamine sulfate, benzoguanamine and the like can be used. These melamine compounds may be surface-treated with a nonionic surfactant or various coupling agents.

  In addition, the total amount of the metal oxide, the metal normal carbonate, and / or the melamine compound is 50 parts by weight or more with respect to 100 parts by weight of the polymer compound in order to improve the flame retarding effect. Preferably, it is preferably 250 parts by weight or less for the purpose of maintaining the moldability of the non-halogen resin composition.

  Moreover, the flame retardance of a non-halogen resin composition can be improved by mix | blending melamine cyanurate in addition to a metal oxide and a metal normal carbonate as a flame retardant. In addition, when aiming at maintaining the moldability of the non-halogen resin composition, the layer addition amount of the metal oxide, the metal orthocarbonate, and the guanidine compound should be 250 parts by weight or less as described above. preferable. Moreover, it is preferable that the quantity of the melamine compound added to a high molecular compound shall be 40 parts or less for the purpose of making the improvement of a flame retardance, and exhibiting alkali resistance compatible.

(Other additives)
The non-halogen resin composition according to the present embodiment can be formed by further adding an additive such as an antioxidant (for example, a phenolic antioxidant), a lubricant, a stabilizer, or a colorant.

(Non-halogen insulated wire)
FIG. 1 shows an example of a cross section of a non-halogen insulated wire using a non-halogen resin composition according to an embodiment of the present invention.

  The non-halogen insulated wire 1 includes a conductor 10 and an outer layer 20 that covers the conductor 10. The outer layer 20 is an insulator layer formed with a predetermined thickness from the non-halogen resin composition according to the present embodiment. The conductor 10 is formed from a metal material having a predetermined diameter. For example, the conductor 10 is formed from a metal material such as copper or a copper alloy. As the copper forming the conductor 10, any of pure copper, tough pitch copper, low oxygen copper, or oxygen free copper can be used.

  FIG. 2 shows an example of a cross section of a non-halogen cable using the non-halogen resin composition according to the embodiment of the present invention.

  The non-halogen cable 2 according to the embodiment includes a twisted pair wire in which a conductor 10 is covered with an insulator 21 and a twisted pair wire twisted together with an interposition 4, a presser winding tape 5 that covers the outer periphery of the twisted pair wire, and a presser A sheath 3 is formed on the outer periphery of the wound tape 5 by extrusion coating and forms the outermost layer of the non-halogen cable 2. And the sheath 3 is formed from the non-halogen resin composition which concerns on this Embodiment. The conductor 10 is formed from a metal material having a predetermined diameter. For example, the conductor 10 is formed from a metal material such as copper or a copper alloy. As copper forming the conductor 10, pure copper, tough pitch copper, low oxygen copper, or oxygen-free copper can be used. The insulator 21 can be formed from the non-halogen resin composition according to the present embodiment or another insulating material.

(Effect of embodiment)
In the non-halogen resin composition according to the embodiment of the present invention, a metal orthocarbonate and a metal oxide, which do not contain a metal hydroxide and release an incombustible gas upon combustion, are mixed with a polymer compound containing an ethylene unit. At the same time, since the amount of the metal orthocarbonate is mixed with the amount of the metal oxide more than the amount of the metal oxide, it has flame retardancy and can exhibit acid resistance and alkali resistance. That is, according to the present embodiment, it is possible to provide a non-halogen resin composition that has good flame resistance evaluation by oxygen index measurement and excellent acid resistance and alkali resistance compared to a resin composition containing a metal hydroxide. .

  Further, the non-halogen resin composition according to the present embodiment does not contain a metal hydroxide such as magnesium hydroxide, and is a flame retardant having a higher flame retardant effect than magnesium hydroxide, for example, a non-metal hydroxide. Since a melamine compound such as melamine cyanurate is added, it is possible to suppress a decrease in mechanical properties and workability, and in particular, it is possible to suppress a decrease in volume resistivity even in an alkaline environment.

  Since the halogen-free resin composition according to the present embodiment does not include halogen-containing compounds, heavy metals such as lead and antimony, an environment-friendly halogen-free resin composition and a halogen-free insulated wire can be provided.

  As an example of the present invention, ethylene-ethyl acrylate copolymer (EEA) and / or ethylene-vinyl acetate copolymer (EVA) is used as a polymer compound, and as a metal normal carbonate, magnesium carbonate, calcium carbonate, dolomite In addition to using huntite, non-halogen resin compositions using titanium oxide, zinc oxide, or alumina as a metal oxide were produced (Examples 1 to 13). Further, as a comparative example, an ethylene-ethyl acrylate copolymer (EEA) or an ethylene-vinyl acetate copolymer (EVA) is used as a polymer compound, and non-halogen using magnesium hydroxide, metal normal carbonate or metal oxide. Resin compositions were produced (Comparative Examples 1 to 8). Furthermore, an ethylene-ethyl acrylate copolymer (EEA) was used as a polymer compound, and a non-halogen resin composition was produced using calcium carbonate as a metal normal carbonate and titanium oxide as a metal oxide. Examples 14 and 15).

  Specifically, the non-halogen resin composition according to Example 1 was mixed with 40 parts by weight of magnesium carbonate and 10 parts by weight of titanium oxide with respect to 100 parts by weight of EEA, and 0.5 parts by weight of phenolic antioxidant. It was manufactured by adding. The non-halogen resin composition according to Example 2 was produced in the same manner as in Example 1 except that the magnesium carbonate in Example 1 was replaced with calcium carbonate. The non-halogen resin composition according to Example 3 was produced in the same manner as in Example 1 except that the magnesium carbonate in Example 1 was replaced with dolomite. The non-halogen resin composition according to Example 4 was produced in the same manner as in Example 1 except that the magnesium carbonate in Example 1 was replaced with huntite. The non-halogen resin composition according to Example 5 was produced in the same manner as in Example 2 except that the titanium oxide in Example 2 was replaced with titanium oxide having a different particle size.

  The non-halogen resin composition according to Example 6 was produced in the same manner as in Example 2 except that the titanium oxide in Example 2 was replaced with zinc oxide. The non-halogen resin composition according to Example 7 was manufactured in the same manner as in Example 2 except that the titanium oxide in Example 2 was replaced with alumina. The non-halogen resin composition according to Example 8 was produced by further adding 10 parts by weight of melamine cyanurate to the non-halogen resin composition according to Example 2. The non-halogen resin composition according to Example 9 was produced in the same manner as in Example 1 except that the titanium oxide in Example 1 was replaced with titanium oxide having a different particle size.

  The non-halogen resin composition according to Example 10 was produced in the same manner as in Example 1 except that the amount of magnesium carbonate added in Example 1 was increased to 90 parts by weight. The non-halogen resin composition according to Example 11 was manufactured by mixing 90 parts by weight of magnesium carbonate and 10 parts by weight of titanium oxide with 100 parts by weight of EVA and adding 0.5 parts by weight of a phenolic antioxidant. did. The non-halogen resin composition according to Example 12 was mixed with 90 parts by weight of magnesium carbonate and 10 parts by weight of titanium oxide with respect to 50 parts by weight of EEA and 50 parts by weight of EVA, and 0.5 parts by weight of phenolic antioxidant. It was manufactured by adding.

  The non-halogen resin composition according to Example 13 is manufactured by mixing 200 parts by weight of calcium carbonate and 50 parts by weight of titanium oxide with respect to 100 parts by weight of EEA, and adding 0.5 parts by weight of a phenolic antioxidant. did. The non-halogen resin composition according to Example 14 was manufactured by adding 200 parts by weight of calcium carbonate, 60 parts by weight of titanium oxide, and 0.5 parts by weight of a phenolic antioxidant to 100 parts by weight of EEA. The non-halogen resin composition according to Example 15 was produced by adding 90 parts by weight of calcium carbonate, 10 parts by weight of titanium oxide, and 0.5 parts by weight of a phenolic antioxidant to 100 parts by weight of EEA.

  Each of the non-halogen resin compositions according to Examples 1 to 15 was produced by kneading each component with a roll preheated to 130 ° C.

  The non-halogen resin composition according to Comparative Example 1 was prepared by adding 100 parts by weight of magnesium hydroxide and 0.5 parts by weight of a phenolic antioxidant to 100 parts by weight of EEA. The non-halogen resin composition according to Comparative Example 2 was produced in the same manner as Comparative Example 1 except that 100 parts by weight of magnesium hydroxide in Comparative Example 1 was replaced with 50 parts by weight of magnesium carbonate. The non-halogen resin composition according to Comparative Example 3 was produced in the same manner as Comparative Example 2 except that the magnesium carbonate of Comparative Example 2 was replaced with calcium carbonate. The non-halogen resin composition according to Comparative Example 4 was produced in the same manner as Comparative Example 2 except that the magnesium carbonate of Comparative Example 2 was replaced with dolomite.

  The non-halogen resin composition according to Comparative Example 5 was produced in the same manner as Comparative Example 2 except that the magnesium carbonate of Comparative Example 2 was replaced with huntite. The non-halogen resin composition according to Comparative Example 6 was produced in the same manner as Comparative Example 2 except that 50 parts by weight of magnesium carbonate of Comparative Example 2 was replaced with 100 parts by weight of titanium oxide. The non-halogen resin composition according to Comparative Example 7 was produced in the same manner as Comparative Example 2 except that 50 parts by weight of magnesium carbonate in Comparative Example 2 was replaced with 100 parts by weight. The non-halogen resin composition according to Comparative Example 8 was produced by adding 100 parts by weight of magnesium carbonate and 0.5 parts by weight of a phenolic antioxidant to 100 parts by weight of EVA.

  And the characteristic of each non-halogen resin composition which concerns on an Example and a comparative example was evaluated. Specifically, each of (1) flame retardant evaluation by oxygen index measurement, (2) inclined combustion test, (3) alkali resistance evaluation, (4) extrusion processability evaluation, and (5) comprehensive evaluation is shown below. The condition was evaluated.

(1) Flame retardancy evaluation by oxygen index measurement compliant with JIS K 7201. Specifically, the measurement was carried out using test pieces (length 80 mm, width 6.5 mm, thickness 3 mm) made of each non-halogen resin composition. When the oxygen index was 25 or more, the flame retardancy was evaluated as “◯” as a pass. On the other hand, when the oxygen index was less than 25, the flame retardancy was rejected as “x”.

(2) Inclined combustion test Using each non-halogen resin composition, a non-halogen insulated wire having a diameter of 3.4 mm as shown in Fig. 1 was produced. And the inclination combustion test was implemented based on JISC3005. A non-halogen insulated electric wire that passed the inclined combustion test and the conductor was not exposed after the combustion test was rated as “O”. On the other hand, a non-halogen insulated electric wire that failed the inclined combustion test and passed the inclined combustion test but whose conductor was exposed after the combustion test was evaluated as “failed”.

(3) Alkali resistance test A sheet having a thickness of 1 mm was prepared using each non-halogen resin composition. The prepared sheet was immersed in an aqueous sodium hydroxide solution having a liquid temperature of 50 ° C. and a concentration of 3% for 30 days. Thereafter, the volume resistivity (Ω · cm) of each sheet was measured to evaluate the alkali resistance of each sheet. As a result, a sheet of the non-halogen resin composition having a volume resistivity of 10 ¹⁰ (Ω · cm) or more was evaluated as acceptable “◯”. On the other hand, the sheet of the non-halogen resin composition having a volume resistivity of less than 10 ¹⁰ was rejected “x”.

(4) Evaluation of extrusion processability Each non-halogen resin composition was extruded with a 40 mm extruder. If the load on the motor of the extruder was able to be extruded within the normal range and the appearance after extrusion was good, the pass was `` O '', while the extrusion load was outside the normal range of the motor, Or, when the appearance after extrusion was not good, it was determined as “Fail”.

(5) Comprehensive evaluation About the non-halogen resin composition which passed in the characteristic evaluation of said (1) to (3), comprehensive evaluation was set to "(circle)". Moreover, about the non-halogen resin composition in which any one of the above (1) to (3) failed, the overall evaluation was “x”.

  Tables 1 and 2 show the detailed material compositions of the non-halogen resin compositions according to Examples and Comparative Examples, and the results of the characteristic evaluation of the non-halogen resin compositions.

  As can be seen by referring to Table 1, in all the non-halogen resin compositions of Examples 1 to 8 and Examples 10 to 13, flame retardancy evaluation by oxygen index measurement, gradient combustion test, alkali resistance evaluation, and extrusion processing It was a pass for sex evaluation. In addition, although the non-halogen resin composition according to Example 9 did not expose the conductor after the gradient combustion test, the exposed portion was caused by using a relatively large titanium oxide having a particle size of 210 nm. Since it was observed, the evaluation was “Δ”. In the non-halogen resin composition according to Example 9, the evaluation in the gradient combustion test was “Δ”, but it was not a practical problem.

  In addition, as shown in the characteristic results of Examples 10 to 12, flame retardant evaluation by the oxygen index measurement, gradient combustion, regardless of whether EEA alone, EVA alone, or a mixture of EEA and EVA is used. The test, alkali resistance evaluation, and extrusion processability evaluation were acceptable. Further, the non-halogen resin composition according to Example 13 was manufactured by adding 250 parts by weight of a flame retardant (calcium carbonate and titanium oxide) to 100 parts by weight of EEA. The flame retardant evaluation by index measurement, the gradient combustion test, the alkali resistance evaluation, and the extrusion processability evaluation were acceptable. Therefore, the comprehensive evaluation of the non-halogen resin compositions according to Examples 1 to 13 was “◯” (passed).

  The non-halogen resin composition according to Comparative Example 1 was shown to be inferior in alkali resistance due to containing magnesium hydroxide. Moreover, it was shown that the non-halogen resin compositions according to Comparative Examples 2 to 5 do not contain a metal oxide and cannot satisfy the oxygen index 25. Moreover, it was shown that the non-halogen resin composition according to Comparative Example 6 does not contain a metal carbonate and cannot satisfy the oxygen index 25. Furthermore, the non-halogen resin compositions according to Comparative Examples 7 and 8 did not contain a metal oxide, and both of them failed the inclined combustion test.

  The non-halogen resin composition according to Example 14 was a non-halogen resin composition produced by mixing 260 parts by weight of a flame retardant with 100 parts by weight of EEA, and did not satisfy the extrusion processability. Since it passed in the flame retardance evaluation by index measurement, (2) inclined combustion test, and (3) alkali resistance test, the comprehensive evaluation was “◯” (pass). The non-halogen resin composition according to Example 15 was manufactured by adding 90 parts by weight of calcium carbonate having an average particle diameter of 8 μm and 10 parts by weight of titanium oxide to 100 parts by weight of EEA. Although the appearance of the non-halogen resin composition after extrusion was not good due to the average particle size of calcium carbonate exceeding 5 μm, (1) flame retardant evaluation by oxygen index measurement, (2) gradient Since it passed in the combustion test and (3) alkali resistance test, the overall evaluation was “◯” (pass).

  The following points are shown from the results of the characteristic evaluation of the above examples and comparative examples. That is, the ratio of the addition amount of the metal orthocarbonate to the metal oxide is larger in the addition amount of the metal orthocarbonate than the addition amount of the metal oxide when the purpose is to improve the flame retardancy. It is preferable to do. In addition, the flame retardance of a non-halogen resin composition improves remarkably by using together a metal oxide and a flame retardant (for example, guanidine compound).

  While the embodiments and examples of the present invention have been described above, the embodiments and examples described above do not limit the invention according to the claims. It should be noted that not all combinations of features described in the embodiments and examples are necessarily essential to the means for solving the problems of the invention.

It is sectional drawing of the halogen-free insulated wire using the halogen-free resin composition which concerns on embodiment of this invention. It is sectional drawing of the halogen-free cable using the halogen-free resin composition which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-halogen insulated electric wire 2 Non-halogen cable 3 Sheath 4 Interposition 5 Presser winding tape 10 Conductor 20 Outer layer 21 Insulator

Claims (8)

A polymer compound containing an olefinic hydrocarbon unit;
A metal oxide mixed with the polymer compound;
A metal salt that is mixed in the polymer compound in an amount greater than the amount of the metal oxide added and releases a non-combustible gas upon combustion;
The polymer compound is a non-halogen resin composition containing no metal hydroxide.   The non-halogen resin composition according to claim 1, wherein the metal salt is a metal normal carbonate, and the incombustible gas is carbon dioxide.   The non-halogen resin composition according to claim 1 or 2, wherein the metal oxide is selected from the group consisting of titanium oxide, zinc oxide, alumina, and magnesium oxide.   The non-halogen resin composition according to any one of claims 1 to 3, wherein the metal orthocarbonate is selected from the group consisting of magnesium carbonate, calcium carbonate, dolomite, and huntite.   The polymer compound includes low-density polyethylene, linear low-density polyethylene, linear ultra-low-density polyethylene, high-density polyethylene, polypropylene, ethylene-methyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl. Acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-butene copolymer, ethylene-propylene copolymer, ethylene-styrene copolymer, Styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-isoprene block copolymer, styrene-ethylene-propylene-styrene block copolymer, ethylene-propylene-di Terpolymers down, and non-halogen resin composition according to any one of claims 1 to 4 which is selected from the group consisting of maleic anhydride grafted low density polyethylene.   The non-halogen resin composition according to any one of claims 1 to 5, wherein the polymer compound is further mixed with a flame retardant which is a non-metal hydroxide. Conductors,
An outer layer covering the conductor,
The outer layer includes a polymer compound, a metal oxide mixed with the polymer compound, and a metal salt that is mixed with the polymer compound in an amount greater than the amount of the metal oxide and releases a non-combustible gas during combustion. A non-halogen insulated wire formed from a non-halogen resin composition comprising no metal hydroxide. Conductors,
An outer layer covering the conductor;
A sheath covering the outer layer,
The sheath includes a polymer compound, a metal oxide mixed with the polymer compound, and a metal salt that is mixed with the polymer compound in an amount greater than the amount of the metal oxide added and releases a noncombustible gas during combustion. A non-halogen cable formed from a non-halogen resin composition comprising no metal hydroxide.

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