JP4381663B2 - Weather resistant flame retardant resin composition and electric wire - Google Patents

Description

【００２８】
【表２】

【００２９】
【表３】

【００３０】
【表４】

【００３１】
参考例１〜３及び比較例１、２
金属水和物の配合量が本発明の範囲内に入っている参考例１〜３は、諸特性を満足していることが確認された。これに対し、比較例１は、金属水和物の配合量が１００重量部と本発明の下限値である１５０重量部を下回るため、その結果、難燃性が不合格となり、又、比較例２は、金属水和物の配合量が２５０重量部と本発明の上限値である２２０重量部を超えているため、その結果、機械的強度（伸び）と耐候性が不合格となることが確認された。
【００３２】
参考例４、５及び比較例３、４
高分子量ヒンダードアミン系光安定剤の配合量が本発明の範囲内に入っている参考例４、５は、諸特性を満足していることが確認された。これに対し、比較例３は、高分子量ヒンダードアミン系光安定剤を配合していないため、その結果、耐候性が不合格となり、又、比較例４は、高分子量ヒンダードアミン系光安定剤の配合量が２０重量部と本発明の上限値である１０重量部を超えているため、その結果、機械的強度（引張強度、伸び）が不合格となることが確認された。
【００３３】
参考例６、７及び比較例５、６
低分子量ヒンダードアミン系光安定剤の配合量が本発明の範囲内に入っている参考例６、７は、諸特性を満足していることが確認された。これに対し、比較例５は、高分子量ヒンダードアミン系光安定剤を配合していないため、その結果、耐候性が不合格となり、又、比較例６は、低分子量ヒンダードアミン系光安定剤の配合量が２０重量部と本発明の上限値である１０重量部を超えているため、その結果、機械的強度（引張強度、伸び）が不合格となることが確認された。
【００３４】
参考例８、９及び比較例７、８
紫外線吸収剤の配合量が本発明の範囲内に入っている参考例８、９は諸特性を満足していることが確認された。これに対し、比較例７は、紫外線吸収剤を配合していないため、その結果、耐候性が不合格となり、又、比較例８は、紫外線吸収剤の配合量が３重量部と本発明の上限値である１重量部を超えているため、その結果、機械的強度（引張強度、伸び）及び耐熱性（伸び残率）が不合格となることが確認された。
【００３５】
配合材料として、更に金属不活性化剤を加えて得られた合計６種類の架橋電線を試料として、機械的強度（引張強度、伸び）、耐熱性、電気特性、難燃性、耐候性に加え、耐銅害性について、それぞれ評価を行った。結果は表３に示した。
【００３６】
耐銅害性の評価方法は以下の通りである。
耐銅害性
導体を取り出したチューブ状サンプルの表面に銅粉末を塗布した状態で、１８０℃の恒温槽内に１６８時間放置した後取り出し、伸びを測定した。要求特性は、伸びが５０％以上とした。
【００３７】
実施例１、２及び比較例９〜１２
ヒドラジン系金属不活性化剤の配合量が本発明の範囲内に入っている実施例１、２は、諸特性に加えて耐銅害性も満足し、更に、金属不活性化剤を配合していない参考例２と比べて耐熱性の伸び残率が向上し、７０％台となっていることが確認された。これに対し、比較例９は、ヒドラジン系金属不活性化剤の配合量が５重量部と本発明の上限値である１重量部を超えているため、耐熱性は向上しているものの、耐候性が不合格となることが確認された。又、比較例１０〜１２では、ヒドラジン系以外の金属不活性化剤を使用しているため、耐熱性の向上はなく、耐候性も不合格となるとともに、耐銅害性の試験では激しく劣化してしまい、伸びを測定することができなかった。
【００３８】
本発明は上記の実施例に限定されるものではない。上記の実施例では本発明に係る樹脂組成物を電線の絶縁被覆材料として使用したが、複数の電線を組み合わせたケーブルのシース材料、コード状ヒータの絶縁被覆材料、チューブの構成材料などとしても使用可能である。
【００３９】
【発明の効果】
以上詳述したように本発明によれば、オレフィン系ポリマーに金属水和物を配合した難燃樹脂組成物に、分子量の異なる二種類の光安定剤と紫外線吸収剤とを併用し、更にそれらを特定量配合することにより、機械的強度、耐熱性、電気特性、難燃性及び耐候性をバランス良く兼ね備えた樹脂組成物を得ることができた。この樹脂組成物は、屋内や屋外に設置される照明用機器のリード線の絶縁被覆材料又はシース材料などとして好適である。[0001]
BACKGROUND OF THE INVENTION
The present invention does not generate harmful gases such as halogen-based gases during combustion, and has a good balance of mechanical strength, heat resistance, electrical characteristics, flame retardancy, and weather resistance, for example, installed indoors or outdoors. The present invention relates to a weather-resistant flame-retardant resin composition suitable as an insulating coating material or sheath material for lead wires of lighting equipment, and an electric wire provided with a coating made of the resin composition.
[0002]
[Prior art]
Olefin polymers have been widely used as insulation coating materials or sheath materials for insulated wires because they have excellent electrical properties, are inexpensive and have good workability. However, since the olefin polymer itself is a flammable substance, it is necessary to impart a high degree of flame retardancy from the viewpoint of safety and fire prevention. Methods of blending flame retardants have been widely adopted. However, they generate a large amount of halogen-based gas at the time of combustion, causing problems such as corrosiveness to surrounding equipment and harmfulness to human bodies. In recent years, it has been demanded not to generate halogen-based gas. A method of blending a metal hydrate such as aluminum hydroxide or magnesium hydroxide has been proposed. However, in this case, by adding a large amount of metal hydrate to the olefin polymer, it is possible to impart the same high level of flame retardancy as when a halogen flame retardant is blended, but the weather resistance, In particular, there was a disadvantage that the light resistance was lowered. If the weather resistance is insufficient, it is difficult to use, for example, as an insulation coating material or a sheath material for lead wires of lighting equipment installed indoors or outdoors. Therefore, conventionally, measures have been taken such as adding a light stabilizer or an ultraviolet absorber to a resin composition in which a metal hydrate is blended with an olefin polymer to impart weather resistance.
[0003]
[Problems to be solved by the invention]
However, when the resin composition obtained by such a method is used as an insulation coating material for lead wires of lighting equipment installed indoors or outdoors, the light stabilizer blended in the resin composition gradually becomes a surface. There was a problem that the effect of the light stabilizer was impaired and the weather resistance did not last for a long time. Therefore, as a result of various studies to solve the problems of the prior art, the present inventors have found that a flame retardant resin composition in which a metal hydrate is blended with an olefin polymer has two types of light having different molecular weights. By using a stabilizer and an ultraviolet absorber in combination, and further blending them in a specific amount, a resin composition having a well-balanced mechanical strength, heat resistance, electrical properties, flame retardancy, and weather resistance can be obtained. As a result, the present invention has been achieved.
[0004]
[Means for Solving the Problems]
That is, the weather resistant flame retardant resin composition according to claim 1 of the present invention comprises (a) 100 parts by weight of an olefin polymer, (b) 150 parts by weight or more and 220 parts by weight or less of metal hydrate, (c) high 0.2 to 10 parts by weight of molecular weight hindered amine light stabilizer, (d) 0.2 to 10 parts by weight of low molecular weight hindered amine light stabilizer having a molecular weight of 600 to 900, (e) UV absorber 0.1 to 1 part by weight and (f) hydrazine-based metal deactivator 0.2 to 1 part by weight are blended.
An electric wire according to claim 2 is provided with a coating made of the resin composition according to claim 1.
An electric wire according to claim 3 is the electric wire according to claim 2, wherein the coating made of the resin composition is crosslinked.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each component which comprises the resin composition of this invention is demonstrated.
(A) Olefin Polymer As the olefin polymer used in the present invention, low density polyethylene (LDPE), medium density polyethylene, high density polyethylene, very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE) , Homopolymers such as linear ultra-low density polyethylene and polypropylene, ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-methyl methacrylate Copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate-styrene graft copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer, ethylene-maleic anhydride graft copolymer, ethylene -Propylene copolymer, ethylene-pro Len - ethylene copolymers such as diene copolymers. Any of these olefin polymers may be used, but polyethylene (LDPE, LLDPE, VLDPE), EVA, EEA, and the like are preferable from the viewpoint of compatibility with the light stabilizer and ultraviolet absorber described below. . These polyolefin polymers may be used alone or in combination of two or more.
[0006]
(B) Metal Hydrate Examples of the metal hydrate used in the present invention include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, hydrotalcite, dosonite, calcium aluminate and the like. Any of these metal hydrates may be used. Magnesium hydroxide and aluminum hydroxide, which release crystal water near the decomposition temperature of the olefin polymer and have a large endotherm, are particularly flame retardant. Is preferable because of high. In addition, these metal hydrates can be obtained, for example, with higher fatty acids such as lauric acid, stearic acid, and oleic acid, or higher fatty acid salts such as aluminum, magnesium, and calcium salts, and silane-based and titanate-based surface treatment agents. The surface-treated product is preferably used in order to improve the affinity with the olefin polymer and improve the dispersibility.
[0007]
The metal hydrate is preferably blended in an amount of 150 to 220 parts by weight with respect to 100 parts by weight of the olefin polymer. When the amount of the metal hydrate is less than 150 parts by weight, it is difficult to obtain the desired sufficient flame retardancy (for example, a level that passes the 60-degree inclined flame retardant test specified in JIS C 3005). Moreover, when it exceeds 220 weight part, the mechanical strength of a resin composition will fall, and also a weather resistance will fall.
[0008]
In the present invention, a light stabilizer is blended for the purpose of imparting weather resistance. At this time, two kinds of light stabilizers having different molecular weights (a high molecular weight hindered amine light stabilizer and a low molecular weight hindered amine light stabilizer) are used. Agent). When each is used alone, sufficient weather resistance cannot be imparted. This is due to the following reasons. That is, when the insulation coating material or sheath material of the electric wire deteriorates due to sunlight or ultraviolet rays emitted from a lighting fixture, the process proceeds from the surface. For this reason, it can be said that a light stabilizer that is easily diffused from the inside to the surface is effective. Low molecular weight hindered amine light stabilizers are small in size and easy to diffuse, so they can effectively prevent deterioration at the initial stage, but they gradually bleed out and dissipate to the outside. Therefore, the effect of the light stabilizer is impaired and the weather resistance is not sustained for a long time. On the other hand, high-molecular-weight hindered amine light stabilizers have a slow diffusion rate, so the deterioration prevention effect due to diffusion from the inside against surface deterioration cannot be expected in the short term, but has the property of not easily dissipating. Therefore, the effect of preventing deterioration is sustained and the weather resistance is maintained for a long time. Therefore, by blending each of these two types of hindered amine light stabilizers in a certain amount or more, the low molecular weight light stabilizer in the initial stage, and the high molecular weight light stabilizer in the long term each exerts an effect of preventing deterioration. Long-term weather resistance can be imparted with a small amount.
[0009]
(C) High molecular weight hindered amine light stabilizer As the high molecular weight hindered amine light stabilizer, one having a molecular weight exceeding 1000 is used. As such, for example, poly [6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-diyl] [( 2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino] and dimethyl-1- (2-hydroxysuccinate) And ethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate. More specifically, commercially available products such as Kimasorb 944LD and Tinuvin 622LD can be used.
[0010]
These high molecular weight hindered amine light stabilizers are preferably blended in an amount of 0.2 to 10 parts by weight with respect to 100 parts by weight of the olefin polymer. If the blending amount of the high molecular weight hindered amine light stabilizer is less than 0.2 parts by weight, the desired sufficient weather resistance cannot be obtained, and if it exceeds 10 parts by weight, an effect of improving weather resistance by increasing the amount is expected. Not only is it impossible, but the mechanical strength is lowered due to the problem of dispersibility, and further blooming occurs.
[0011]
(D) Low molecular weight hindered amine light stabilizer As the low molecular weight hindered amine light stabilizer, one having a molecular weight of 1000 or less, preferably 900 or less, more preferably 600 or more and 900 or less is used. If the molecular weight is less than 600, the diffusion rate is too high, so it may be dissipated to the outside in a very short period. If the molecular weight exceeds 900, the diffusion rate will be slowed, preventing deterioration in the initial stage. The effect may be diminished. For example, tris (2,2,6,6-tetramethyl-4-piperidyl) benzene-1,3,5-tricarboxylate, tris (2,2,6,6-tetramethyl) -4-piperidyl) -2-acetoxypropane-1,2,3-tricarboxylate, tris (2,2,6,6-tetramethyl-4-piperidyl) -2-hydroxypropane-1,2,3- Tricarboxylate, tris (2,2,6,6-tetramethyl-4-piperidyl) triazine-2,4,6-tricarboxylate, tris (2,2,6,6-tetramethyl-4-piperidyl) Butane-1,2,3-tricarboxylate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) propane-1,1,2,3-tetracarboxylate, teto Kiss (2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1, 2,3,4-butanetetracarboxylate, 2- (3,5-di-tert-butyl-4-hydroxybenzyl) -2-n-butylmalonate bis (1,2,2,6,6-pentamethyl -4-piperidyl) and the like. More specifically, commercially available products such as ADK STAB LA-57, ADK STAB LA-52, and Tinuvin 144 can be used.
[0012]
These low molecular weight hindered amine light stabilizers are preferably blended in an amount of 0.2 to 10 parts by weight with respect to 100 parts by weight of the olefin polymer. If the blending amount of the low molecular weight hindered amine light stabilizer is less than 0.2 parts by weight, the desired sufficient weather resistance cannot be obtained, and if it exceeds 10 parts by weight, an effect of improving weather resistance by increasing the amount is expected. Not only is it impossible, but the mechanical strength is lowered due to the problem of dispersibility, and further blooming occurs.
[0013]
(E) UV absorbers Examples of UV absorbers include 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole and 2- (3,5-di-t-amyl). 2-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-5′-methyl-phenyl) benzotriazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2- (2 '-Hydroxy-3', 5'-di-t-amylphenyl) benzotriazole, 2- [2'-hydroxy-3 '-(3 ", 4", 5 ", 6" -tetrahydro- Phthalimidomethyl) -5′-methylphenyl] benzotriazole, 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] , 2- [2 Hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (2-hydroxy-4-octyloxyphenyl) -2H-benzotriazole, 2- (2H-benzotriazole- Benzotriazoles such as 2-yl) -4-methyl-6- (3,4,5,6-tetrahydrophthalimidylmethyl) phenol, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2 , 2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2,2 ', 4,4'-tetrahydroxy Benzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 3,5-di-t -Butyl-4-hydroxybenzoyl acid, n-hexadecyl ester, 1,4-bis (4-benzoyl-3-hydroxyphenoxy) butane, 1,6-bis (4-benzoyl-3-hydroxyphenoxy) hexane, etc. Examples thereof include benzophenone series and cyanoacrylate series typified by ethyl-2-cyano-3,3-diphenyl acrylate. More specifically, those commercially available under trade names such as Tinuvin 320, Tinuvin 328, Tinuvin 234, Adeka Stub LA31, SEESORB102, SEESORB103, and SEESORB501 can be used.
[0014]
These ultraviolet absorbers are preferably blended in an amount of 0.1 to 1 part by weight with respect to 100 parts by weight of the olefin polymer. If the blending amount of the UV absorber is less than 0.1 parts by weight, the desired sufficient weather resistance cannot be obtained, and if it exceeds 1 part by weight, the resin composition becomes yellow due to the hue of the UV absorber itself. It will be colored, the mechanical strength and heat resistance will be lowered, and blooming will occur.
[0015]
(F) Hydrazine-based metal deactivator In the present invention, in addition to the above components, (f) hydrazine-based metal deactivator may be further blended. By blending a hydrazine-based metal deactivator, copper damage can be prevented while maintaining the weather resistance of the resulting resin composition, and the heat resistance can be further improved. Examples of the hydrazine-based metal deactivator include decamethylene dicarboxylic acid disalicyloyl hydrazide. These metal deactivators are preferably blended in an amount of 0.2 to 1 part by weight per 100 parts by weight of the olefin polymer. When the compounding amount of the metal deactivator is less than 0.2 parts by weight, the effect of preventing copper damage is not sufficient, and the effect of improving heat resistance cannot be obtained. On the other hand, when the amount exceeds 1 part by weight, the weather resistance is lowered and the cost is further increased.
[0016]
In the present invention, in addition to the above-described constituent materials, various additives that are conventionally used in electric wires and cables may be blended within a range that does not impair the object of the present invention. Examples of such additives include flame retardant aids, crosslinking agents, crosslinking aids, lubricants, softeners, dispersants, antioxidants, processing aids, stabilizers, colorants, pigments, and the like. By kneading these various additives with the above-mentioned constituent materials as necessary using a known kneader such as an internal mixer, a uniaxial kneader, or a biaxial kneader. The resin composition of the present invention can be obtained.
[0017]
The thus obtained resin composition of the present invention is extrusion coated on the circumference of the conductor by a known method, and then subjected to appropriate crosslinking, whereby the electric wire according to another aspect of the present invention can be obtained. At this time, when the resin composition of the present invention is applied to an electric wire having a coating thickness of 0.3 mm or more, the excellent characteristics of the resin composition of the present invention are particularly remarkably exhibited. . When the thickness of the coating is less than 0.3 mm, the amount of the light stabilizer present inside the insulator is insufficient, which may cause a problem in weather resistance.
[0018]
The crosslinking method is not particularly limited. For example, 1,3-bis (t-butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, dicumyl peroxide, etc. Chemical crosslinking method using organic peroxide as a crosslinking agent, irradiation crosslinking method using ionizing radiation such as X-ray, γ-ray, electron beam, proton beam, deuteron beam, α-ray, β-ray, etc. It is done.
[0019]
【Example】
Examples of the present invention will be described below together with comparative examples. The details of each compounding material used in this example are as shown in Table 4.
[0020]
The compounding materials shown in Table 4 were sufficiently kneaded with a twin-screw kneader, and the resulting resin composition was pelletized and then supplied to a 25 mmφ extruder with L / D = 24. Under a temperature condition of 160 ° C., extrusion coating was performed with a thickness of 0.8 mm on a conductor circumference made of 0.8φ tin-plated annealed copper wire. Thereafter, an electron beam was irradiated under the conditions of an acceleration voltage of 650 kV and an irradiation dose of 100 kGy to produce a bridged electric wire having a finished outer diameter of 2.4 mmφ.
[0021]
Here, using a total of 17 types of cross-linked electric wires thus obtained as samples, mechanical strength (tensile strength, elongation), heat resistance, electrical properties, flame retardancy, and weather resistance were evaluated. The results are shown in Tables 1 and 2.
[0022]
The evaluation method is as follows.
Mechanical strength Tensile strength and elongation were measured according to JIS C 3005 (2000). Each required characteristic is cited from the required characteristic of an insulator in the Electrical Appliance and Material Safety Law, and the tensile strength is 10 MPa or more and the elongation is 200% or more.
[0023]
The sample was left for 168 hours in a thermostat maintained at 180 ° C. and then taken out, and the residual tensile strength and the residual elongation were measured in accordance with JIS C3005 (2000). The required properties were a tensile strength residual ratio of 70% or more and an elongation residual ratio of 50% or more.
[0024]
Electrical characteristics An underwater withstand voltage test was performed in accordance with JIS C 3005 (2000). Judgment criteria of the test were quoted from the required characteristics of insulators in the Electrical Appliance and Material Safety Law, and those that were held at AC 1.5 kV for 1 minute and did not break down were regarded as acceptable.
[0025]
Flame retardance A 60 degree flame retardancy test was carried out according to JIS C 3005 (2000). The judgment criteria of the test were determined to be acceptable if they were self-extinguished within 60 seconds.
[0026]
A sample was set at a position 240 mm away from a 400 W transparent high-pressure mercury lamp light source located in the center of the weather-resistant rotating gear oven, taken out at 120 ° C. for 1500 hours, and then measured for elongation. The required characteristics were an elongation of 50% or more.
[0027]
[Table 1]

[0028]
[Table 2]

[0029]
[Table 3]

[0030]
[Table 4]

[0031]
Reference Examples 1 to 3 and Comparative Examples 1 and 2
It was confirmed that Reference Examples 1 to 3 in which the blending amount of the metal hydrate was within the scope of the present invention satisfied various characteristics. On the other hand, in Comparative Example 1, since the blending amount of the metal hydrate is less than 100 parts by weight and 150 parts by weight which is the lower limit of the present invention, as a result, the flame retardancy is rejected. 2, since the compounding amount of the metal hydrate exceeds 250 parts by weight and 220 parts by weight, which is the upper limit of the present invention, mechanical strength (elongation) and weather resistance may be rejected as a result. confirmed.
[0032]
Reference Examples 4 and 5 and Comparative Examples 3 and 4
It was confirmed that Reference Examples 4 and 5 in which the blending amount of the high molecular weight hindered amine light stabilizer was within the scope of the present invention satisfied various characteristics. On the other hand, since Comparative Example 3 does not contain a high molecular weight hindered amine light stabilizer, as a result, the weather resistance is unacceptable. In Comparative Example 4, the high molecular weight hindered amine light stabilizer is added. Exceeds 20 parts by weight and 10 parts by weight which is the upper limit of the present invention. As a result, it was confirmed that the mechanical strength (tensile strength, elongation) was rejected.
[0033]
Reference Examples 6 and 7 and Comparative Examples 5 and 6
It was confirmed that Reference Examples 6 and 7 in which the blending amount of the low molecular weight hindered amine light stabilizer was within the scope of the present invention satisfied various characteristics. On the other hand, since Comparative Example 5 does not contain a high molecular weight hindered amine light stabilizer, as a result, the weather resistance is unacceptable. In Comparative Example 6, the low molecular weight hindered amine light stabilizer is added. Exceeds 20 parts by weight and 10 parts by weight which is the upper limit of the present invention. As a result, it was confirmed that the mechanical strength (tensile strength, elongation) was rejected.
[0034]
Reference Examples 8 and 9 and Comparative Examples 7 and 8
It was confirmed that Reference Examples 8 and 9 in which the blending amount of the ultraviolet absorber was within the range of the present invention satisfied various characteristics. On the other hand, since Comparative Example 7 does not contain an ultraviolet absorber, as a result, the weather resistance is rejected. In Comparative Example 8, the amount of the ultraviolet absorber is 3 parts by weight. Since it exceeded 1 weight part which is an upper limit, as a result, it was confirmed that mechanical strength (tensile strength, elongation) and heat resistance (elongation residual ratio) fail.
[0035]
In addition to mechanical strength (tensile strength, elongation), heat resistance, electrical properties, flame resistance, and weather resistance, a total of six types of cross-linked electric wires obtained by adding a metal deactivator as a compounding material were used as samples. The copper damage resistance was evaluated. The results are shown in Table 3.
[0036]
The copper damage resistance evaluation method is as follows.
With the copper powder applied to the surface of the tubular sample from which the copper-resistant conductor was taken out, it was left in a constant temperature bath at 180 ° C. for 168 hours, taken out, and the elongation was measured. The required characteristics were an elongation of 50% or more.
[0037]
Examples 1 and 2 and Comparative Examples 9-12
Examples 1 and 2 in which the blending amount of the hydrazine-based metal deactivator falls within the scope of the present invention satisfy the copper damage resistance in addition to the various characteristics, and further, a metal deactivator is blended. It was confirmed that the heat-resisting elongation remaining ratio was improved as compared with Reference Example 2 which was not in the range of 70%. On the other hand, in Comparative Example 9, since the blending amount of the hydrazine-based metal deactivator exceeds 5 parts by weight and 1 part by weight which is the upper limit of the present invention, the heat resistance is improved, but the weather resistance It was confirmed that the property was rejected. In Comparative Examples 10 to 12, since a metal deactivator other than hydrazine is used, the heat resistance is not improved, the weather resistance is also rejected, and the copper damage resistance test is severely deteriorated. As a result, the elongation could not be measured.
[0038]
The present invention is not limited to the above embodiments. In the above embodiments, the resin composition according to the present invention is used as an insulating coating material for electric wires. However, it is also used as a sheath material for cables in which a plurality of electric wires are combined, an insulating coating material for cord heaters, a constituent material for tubes, and the like. Is possible.
[0039]
【The invention's effect】
As described above in detail, according to the present invention, two types of light stabilizers and ultraviolet absorbers having different molecular weights are used in combination with a flame retardant resin composition in which a metal hydrate is blended with an olefin polymer, and further, By blending a specific amount, a resin composition having a good balance of mechanical strength, heat resistance, electrical properties, flame retardancy, and weather resistance could be obtained. This resin composition is suitable as an insulating coating material or sheath material for lead wires of lighting equipment installed indoors or outdoors.

Claims (3)

  (B) 150 parts by weight or more and 220 parts by weight or less of (b) metal hydrate, (c) 0.2 to 10 parts by weight of a high molecular weight hindered amine light stabilizer, d) 0.2 to 10 parts by weight of a low molecular weight hindered amine light stabilizer having a molecular weight of 600 to 900, (e) 0.1 to 1 part by weight of an ultraviolet absorber, and (f) a hydrazine-based metal stabilizer. The weather resistant flame retardant resin composition according to claim 1, wherein 0.2 to 1 part by weight of an activator is blended.   An electric wire comprising a coating made of the resin composition according to claim 1. The electric wire according to claim 2, wherein the coating made of the resin composition is cross-linked.