JPH09124846A - Rubber composition and protective tube and electric cable - Google Patents
Rubber composition and protective tube and electric cableInfo
- Publication number
- JPH09124846A JPH09124846A JP30689795A JP30689795A JPH09124846A JP H09124846 A JPH09124846 A JP H09124846A JP 30689795 A JP30689795 A JP 30689795A JP 30689795 A JP30689795 A JP 30689795A JP H09124846 A JPH09124846 A JP H09124846A
- Authority
- JP
- Japan
- Prior art keywords
- rubber composition
- maleic anhydride
- crystalline polyolefin
- cross
- protective tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、優れた耐熱性、耐
油性、機械的特性及び可とう性を有するとともに、特に
高温時の機械的特性を著しく向上させたゴム組成物と、
このゴム組成物を構成材料として用いた、特に、自動
車、産業ロボット等で好適に使用される保護チューブ及
び電線に関するものである。TECHNICAL FIELD The present invention relates to a rubber composition which has excellent heat resistance, oil resistance, mechanical properties and flexibility and has remarkably improved mechanical properties especially at high temperatures,
The present invention relates to a protective tube and an electric wire using the rubber composition as a constituent material, which is preferably used particularly in automobiles, industrial robots and the like.
【0002】[0002]
【従来の技術】自動車、産業ロボット等の電気配線にお
いて、絶縁電線上、または複数本の絶縁電線を引き揃え
たり、撚り合わせたりしてなる絶縁電線束の上に、集
束、絶縁保護、耐熱保護、機械的保護などを目的として
チューブを被せる方法が一般的に知られているが、従来
この種の保護チューブの構成材料としては、例えば、軟
質塩化ビニル樹脂、架橋ポリオレフィン樹脂、フッ素樹
脂、フッ素ゴムなどが用いられている。2. Description of the Related Art In electrical wiring of automobiles, industrial robots, etc., focusing, insulation protection, and heat protection are provided on an insulated wire or on an insulated wire bundle formed by aligning or twisting a plurality of insulated wires. , A method of covering the tube for the purpose of mechanical protection is generally known, but conventionally, as a constituent material of this type of protective tube, for example, soft vinyl chloride resin, crosslinked polyolefin resin, fluororesin, fluororubber Are used.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、昨今の
機器の高耐熱化、省スペース化、低コスト化などの要求
に対して、上記の構成材料では今や対応しきれなくなっ
ているのが現状である。まず、軟質塩化ビニル樹脂から
なるチューブは、極めて優れた機械的特性を有し、かつ
可とう性にも優れるものの、耐熱性に劣るという問題点
がある。架橋ポリオレフィン樹脂からなるチューブは、
可とう性に優れるものは、耐油性に劣り、耐油性に優れ
るものは可とう性に劣るという問題点がある。フッ素樹
脂からなるチューブは、優れた耐熱性と耐油性を有する
ものの、可とう性に劣り、更に高価であるという問題点
がある。フッ素ゴムはフッ素樹脂に比べて可とう性に優
れるものの、これも高価である。However, in the present circumstances, the above-mentioned constituent materials are no longer able to meet the recent demands for high heat resistance, space saving, and cost reduction of equipment. . First, a tube made of a soft vinyl chloride resin has extremely excellent mechanical properties and excellent flexibility, but has a problem of poor heat resistance. A tube made of cross-linked polyolefin resin
A material having excellent flexibility has poor oil resistance, and a material having excellent oil resistance has poor flexibility. Although a tube made of a fluororesin has excellent heat resistance and oil resistance, it has a problem that it is inferior in flexibility and more expensive. Although fluororubber is more flexible than fluororesin, it is also expensive.
【0004】本発明はこのような点に基づいてなされた
もので、その目的とするところは、優れた耐熱性、耐油
性、機械的特性及び可とう性を有するとともに、特に高
温時の機械的特性(高温耐摩耗性)を著しく向上させた
ゴム組成物と、このゴム組成物を構成材料として用いた
保護チューブ及び電線を提供することにある。The present invention has been made on the basis of the above points, and an object of the present invention is to have excellent heat resistance, oil resistance, mechanical properties and flexibility as well as mechanical properties at high temperatures. (EN) It is intended to provide a rubber composition having markedly improved characteristics (high temperature abrasion resistance), and a protective tube and an electric wire using the rubber composition as a constituent material.
【0005】[0005]
【課題を解決するための手段】上記の目的を達成するべ
く本発明によるゴム組成物は、水素添加アクリロニトリ
ル−ブタジエン共重合体と、無水マレイン酸を含有する
結晶性ポリオレフィン組成物を40:60〜70:30
の重量比で混合して得られた混合物を主成分とするもの
である。To achieve the above object, a rubber composition according to the present invention comprises a crystalline polyolefin composition containing a hydrogenated acrylonitrile-butadiene copolymer and maleic anhydride in a proportion of 40: 60-. 70:30
The main component is a mixture obtained by mixing at a weight ratio of.
【0006】本発明の他の態様による保護チューブは、
水素添加アクリロニトリル−ブタジエン共重合体と、無
水マレイン酸を含有する結晶性ポリオレフィン組成物を
40:60〜70:30の重量比で混合して得られた混
合物を主成分としたゴム組成物をチューブ状に押成成形
し、架橋を施したものである。A protective tube according to another aspect of the invention is
A tube is a rubber composition containing a hydrogenated acrylonitrile-butadiene copolymer and a crystalline polyolefin composition containing maleic anhydride in a weight ratio of 40:60 to 70:30 as a main component. It is formed by pressing and then cross-linked.
【0007】本発明の他の態様による電線は、水素添加
アクリロニトリル−ブタジエン共重合体と、無水マレイ
ン酸を含有する結晶性ポリオレフィン組成物を40:6
0〜70:30の重量比で混合して得られた混合物を主
成分としたゴム組成物からなる架橋被覆層が導体外周に
設けられたものである。An electric wire according to another embodiment of the present invention comprises a crystalline polyolefin composition containing hydrogenated acrylonitrile-butadiene copolymer and maleic anhydride at 40: 6.
A crosslinked coating layer made of a rubber composition containing a mixture obtained by mixing at a weight ratio of 0 to 70:30 as a main component is provided on the outer circumference of the conductor.
【0008】[0008]
【発明の実施の形態】本発明においては、アクリロニト
リル−ブタジエン共重合体(NBR)として水素添加N
BRを使用する。水素を添加していないNBRでは、目
的とする十分な機械的特性、特に高温時の機械的特性
(高温耐摩耗性)と耐熱性を得ることができない。水素
添加NBRとしては、好ましくは、残存二重結合量が
1.0%以下であるものを使用する。残存二重結合量が
1.0%を超える水素添加NBRでは、目的とする十分
な耐熱性を得ることができない。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, hydrogenated N is used as an acrylonitrile-butadiene copolymer (NBR).
Use BR. With NBR to which hydrogen is not added, desired sufficient mechanical properties, particularly mechanical properties at high temperatures (high temperature abrasion resistance) and heat resistance cannot be obtained. As the hydrogenated NBR, one having a residual double bond content of 1.0% or less is preferably used. With hydrogenated NBR in which the amount of residual double bonds exceeds 1.0%, the desired sufficient heat resistance cannot be obtained.
【0009】本発明において使用される無水マレイン酸
を含有する結晶性ポリオレフィン組成物とは、オレフィ
ン−無水マレイン酸共重合体と、結晶性ポリオレフィン
とを混合したものである。ここで、オレフィン−無水マ
レイン酸共重合体を構成するオレフィンとしては、エチ
レン、プロピレン、ブテン−1、アクリル酸エステル、
メタクリル酸エステル、ビニルエステルなどが挙げられ
る。これらの中から1種または2種以上のものが適宜選
択されて無水マレイン酸と共重合若しくはグラフト重合
される。The crystalline polyolefin composition containing maleic anhydride used in the present invention is a mixture of an olefin-maleic anhydride copolymer and a crystalline polyolefin. Here, as the olefin constituting the olefin-maleic anhydride copolymer, ethylene, propylene, butene-1, acrylic ester,
Methacrylic acid ester, vinyl ester and the like can be mentioned. One or two or more of these are appropriately selected and copolymerized or graft-polymerized with maleic anhydride.
【0010】結晶性ポリオレフィンとしては、ポリエチ
レン、ポリプロピレン、エチレン−酢酸ビニル共重合
体、エチレン−αオレフィン共重合体、エチレン−メタ
クリル酸メチル共重合体、エチレン−アクリル酸エチル
共重合体などが挙げられる。これらは単独で使用しても
良いし、2種以上を併用しても良いが、好ましくは、J
IS K 6760(1981)に準拠して測定した密度
が0.890g/cm3以上0.920g/cm3以下
であり、かつASTM D747−70に準拠して測定
した曲げ剛性率が900kg/cm2以下となるように
適宜調整して使用する。密度が0.890g/cm3未
満の結晶性ポリオレフィンでは、耐油性が低下し、密度
が0.920g/cm3を超える結晶性ポリオレフィン
では可とう性が低下してしまう。密度が上記の範囲内で
あっても曲げ剛性率が900kg/cm2を超えるもの
では、可とう性が低下してしまう。Examples of the crystalline polyolefin include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer and the like. . These may be used alone or in combination of two or more, but preferably J
IS K 6760 (1981) Density measured in accordance with is less 0.890 g / cm 3 or more 0.920 g / cm 3, and ASTM D747-70 measured flexural modulus in conformity with the 900 kg / cm 2 It is used by appropriately adjusting it as follows. Crystalline polyolefins having a density of less than 0.890 g / cm 3 reduce oil resistance, and crystalline polyolefins having a density of more than 0.920 g / cm 3 reduce flexibility. Even if the density is within the above range, if the flexural rigidity exceeds 900 kg / cm 2 , the flexibility will decrease.
【0011】本発明においては、水素添加NBRと、無
水マレイン酸を含有する結晶性ポリオレフィン組成物を
40:60〜70:30の重量比で混合することを必須
としている。水素添加NBRの重量比が40未満では目
的とする十分な機械的特性、特に高温時の機械的特性
(高温耐摩耗性)と耐油性を得ることができず、一方7
0を超えると耐熱性が低下してしまう。In the present invention, it is essential to mix the hydrogenated NBR and the crystalline polyolefin composition containing maleic anhydride in a weight ratio of 40:60 to 70:30. If the weight ratio of the hydrogenated NBR is less than 40, the desired sufficient mechanical properties, particularly mechanical properties at high temperature (high temperature abrasion resistance) and oil resistance cannot be obtained, while 7
If it exceeds 0, the heat resistance will decrease.
【0012】上記の混合物に、難燃剤、酸化防止剤、充
填剤、架橋剤、架橋助剤等の従来公知の各種添加剤を、
必要に応じて適宜配合することによって本発明のゴム組
成物が完成する。本発明によって得られたゴム組成物
は、優れた耐熱性、耐油性、機械的特性及び可とう性を
有するものであるが、特に高温時における機械的特性
(高温耐摩耗性)が著しく向上したものとなる。この理
由は、オレフィン−無水マレイン酸共重合体のオレフィ
ン成分が結晶性ポリオレフィンとの親和性を分担し、無
水マレイン酸成分が極性材料である水素添加NBRとの
親和性を可能にしていることにより、水素添加NBRと
結晶性ポリオレフィンとが十分に混ざり合うためと推定
される。To the above mixture, various conventionally known additives such as flame retardants, antioxidants, fillers, cross-linking agents and cross-linking aids,
The rubber composition of the present invention is completed by appropriately blending it as necessary. The rubber composition obtained by the present invention has excellent heat resistance, oil resistance, mechanical properties and flexibility, but the mechanical properties at high temperatures (high temperature abrasion resistance) are remarkably improved. Will be things. The reason for this is that the olefin component of the olefin-maleic anhydride copolymer shares the affinity with the crystalline polyolefin, and the maleic anhydride component enables the affinity with the hydrogenated NBR, which is a polar material. It is presumed that the hydrogenated NBR and the crystalline polyolefin are sufficiently mixed with each other.
【0013】本発明の他の態様による保護チューブは、
上記構成のゴム組成物を公知の押出機を用いてチューブ
状に押出成形し、その後、高圧蒸気または放射線照射な
どによって架橋を施すことにより得ることができる。架
橋方法は特に限定されないので、適宜に選択する。高圧
蒸気により架橋する場合は、上記ゴム組成物に予め架橋
剤を添加しておく必要がある。架橋剤としては、例え
ば、1,3−ビス(第三ブチルペルオキシイソプロピ
ル)ベンゼン、1,1−ビス(第三ブチルペルオキシ)
−3,3,5−トリメチルシクロヘキサン、ジクミルパ
ーオキサイドなどの有機過酸化物が挙げられる。放射線
の照射により架橋する場合は、電子線架橋、ガンマ線架
橋、どちらの方法であっても良いが、電子線架橋の方が
放射線管理は容易である。A protective tube according to another aspect of the present invention comprises:
It can be obtained by extrusion-molding the rubber composition having the above-mentioned configuration into a tube shape using a known extruder, and then subjecting the rubber composition to cross-linking by high-pressure steam or radiation irradiation. The crosslinking method is not particularly limited and is appropriately selected. When cross-linking with high-pressure steam, it is necessary to add a cross-linking agent to the rubber composition in advance. Examples of the cross-linking agent include 1,3-bis (tertiary butylperoxyisopropyl) benzene and 1,1-bis (tertiary butylperoxy) benzene.
Organic peroxides such as -3,3,5-trimethylcyclohexane and dicumyl peroxide may be mentioned. In the case of cross-linking by irradiation with radiation, either electron beam cross-linking or gamma ray cross-linking may be used, but electron beam cross-linking is easier in radiation control.
【0014】本発明の他の態様による電線は、上記構成
のゴム組成物を公知の押出機を用いて導体外周に押出被
覆し、その後、高圧蒸気または放射線照射などによって
架橋を施すことにより得ることができる。架橋方法は特
に限定されないので、適宜に選択する。高圧蒸気により
架橋する場合は、上記ゴム組成物に予め架橋剤を添加し
ておく必要がある。架橋剤としては、例えば、1,3−
ビス(第三ブチルペルオキシイソプロピル)ベンゼン、
1,1−ビス(第三ブチルペルオキシ)−3,3,5−
トリメチルシクロヘキサン、ジクミルパーオキサイドな
どの有機過酸化物が挙げられる。放射線の照射により架
橋する場合は、電子線架橋、ガンマ線架橋、どちらの方
法であっても良いが、電子線架橋の方が放射線管理は容
易である。The electric wire according to another embodiment of the present invention is obtained by extrusion coating the outer periphery of the conductor with the rubber composition having the above-mentioned constitution using a known extruder, and then subjecting it to crosslinking by high-pressure steam or radiation irradiation. You can The crosslinking method is not particularly limited and is appropriately selected. When cross-linking with high-pressure steam, it is necessary to add a cross-linking agent to the rubber composition in advance. Examples of the cross-linking agent include 1,3-
Bis (tert-butylperoxyisopropyl) benzene,
1,1-bis (tertiary butylperoxy) -3,3,5-
Examples thereof include organic peroxides such as trimethylcyclohexane and dicumyl peroxide. In the case of cross-linking by irradiation with radiation, either electron beam cross-linking or gamma ray cross-linking may be used, but electron beam cross-linking is easier in radiation control.
【0015】[0015]
【実施例】以下に本発明の実施例を比較例と併せて説明
する。尚、この実施例で使用した各配合材料の詳細は表
3に示すとおりである。表3中、水素添加NBR及びN
BRのムーニー粘度は、JIS K 6300(198
1)に準拠し試験温度100℃にて測定した値を示して
いる。また、エチレン−アクリル酸エステル−無水マレ
イン酸三元共重合体及び結晶性ポリオレフィンのMFR
(メルトフローレート)は、JIS K 6760(19
81)に準拠して測定した値を示している。また、エチ
レン−アクリル酸エステル−無水マレイン酸三元共重合
体及び結晶性ポリオレフィンの曲げ剛性率は、ASTM
D747−70に準拠して測定した値である。また、
結晶性ポリオレフィンの密度は、JIS K 6760
(1981)に準拠して測定した値を示している。EXAMPLES Examples of the present invention will be described below together with comparative examples. Details of each compounding material used in this example are as shown in Table 3. In Table 3, hydrogenated NBR and N
The Mooney viscosity of BR is JIS K 6300 (198
The values measured at a test temperature of 100 ° C. according to 1) are shown. Further, ethylene-acrylic acid ester-maleic anhydride terpolymer and MFR of crystalline polyolefin
(Melt flow rate) is based on JIS K 6760 (19
81) The value measured according to 81) is shown. Further, the bending rigidity of ethylene-acrylic acid ester-maleic anhydride terpolymer and crystalline polyolefin is
It is a value measured according to D747-70. Also,
The density of the crystalline polyolefin is JIS K 6760.
The values measured according to (1981) are shown.
【0016】まず、表1及び表2に示した配合材料を6
インチオープンロールで充分に混練し、得られたゴム組
成物をペレット化した後、L/D=20、圧縮比2.0
の20mmφ押出機に供給し、シリンダー140℃、ヘ
ッド120℃の温度条件にて、厚さ0.5mm、内径
5.0mmのチューブを押出成形した。その後、加圧電
圧800kv、照射線量150kGyの条件で電子線を
照射して架橋を施した。First, 6 parts of the compounding materials shown in Tables 1 and 2 are used.
After thoroughly kneading with an inch open roll and pelletizing the obtained rubber composition, L / D = 20, compression ratio 2.0
To a 20 mmφ extruder, and a tube having a thickness of 0.5 mm and an inner diameter of 5.0 mm was extrusion-molded under the temperature conditions of a cylinder 140 ° C. and a head 120 ° C. Then, electron beam irradiation was performed under the conditions of a pressurizing voltage of 800 kv and an irradiation dose of 150 kGy to perform crosslinking.
【0017】次に、このようにして得られた合計14種
類(実施例1乃至実施例7、比較例1乃至比較例7)の
チューブを試料として、機械的特性(引張強さ及び伸
び、高温耐摩耗性)、耐熱性(引張強さ残率及び伸び残
率)、耐油性(引張強さ残率及び伸び残率)、可とう性
(引張弾性率)について、それぞれ評価を行った。結果
は表1及び表2に併せて示した。Next, using a total of 14 types of tubes (Examples 1 to 7 and Comparative Examples 1 to 7) thus obtained as samples, mechanical properties (tensile strength and elongation, high temperature) were measured. Abrasion resistance), heat resistance (residual tensile strength and residual elongation), oil resistance (residual tensile strength and residual elongation), and flexibility (tensile elastic modulus) were evaluated. The results are shown in Tables 1 and 2.
【0018】評価方法は以下の通りである。機械的特性 引張強さと伸びをJIS C 3005(1986)に準
拠して測定した。従来の架橋ポリオレフィン樹脂製チュ
ーブの実力値に基づき、引張強さ10.4MPa以上、
伸び200%以上を合格ラインとした。高温耐摩耗性
は、チューブ内径5.0mmに略等しい外径を有する金
属棒をチューブ内に挿入した後、JASO D 608−
92に準拠して荷重510gのブレードを用いた往復法
による摩耗試験を150℃雰囲気中でそれぞれ8回行
い、金属棒が露出する回数の平均値を測定した。従来の
架橋ポリオレフィン樹脂製チューブの実力値に基づき、
50回以上を合格ラインとした。The evaluation method is as follows. Mechanical Properties Tensile strength and elongation were measured according to JIS C 3005 (1986). Based on the actual value of the conventional cross-linked polyolefin resin tube, tensile strength 10.4 MPa or more,
An elongation of 200% or more was taken as a pass line. High temperature wear resistance is measured by JASO D 608- after inserting a metal rod having an outer diameter substantially equal to the inner diameter of the tube of 5.0 mm into the tube.
In accordance with No. 92, a wear test by a reciprocating method using a blade with a load of 510 g was performed 8 times in an atmosphere of 150 ° C., and the average value of the number of times the metal rod was exposed was measured. Based on the actual value of conventional crosslinked polyolefin resin tubes,
The pass line was set 50 times or more.
【0019】耐熱性 各試料を180℃に保持された恒温槽内に168時間放
置した後取り出し、JIS C 3005(1986)に
準拠して、引張強さ残率と伸び残率を測定した。従来の
架橋ポリオレフィン樹脂製チューブの実力値に基づき、
引張強さ残率70%以上、伸び残率65%以上を合格ラ
インとした。 Heat resistance Each sample was left in a thermostat kept at 180 ° C. for 168 hours and then taken out, and the residual tensile strength and the residual elongation were measured according to JIS C 3005 (1986). Based on the actual value of conventional crosslinked polyolefin resin tubes,
The tensile strength residual rate of 70% or more and the elongation residual rate of 65% or more were taken as the pass line.
【0020】耐油性 各試料を150℃に保温されたASTM No.3オイル
中に72時間浸漬した後取り出し、JIS C 3005
(1986)に準拠して、引張強さ残率と伸び残率を測
定した。従来の架橋ポリオレフィン樹脂製チューブの実
力値に基づき、引張強さ残率60%以上、伸び残率60
%以上を合格ラインとした。 Oil resistance Each sample was immersed in ASTM No. 3 oil kept at 150 ° C. for 72 hours and then taken out to obtain JIS C 3005.
According to (1986), the residual tensile strength and the residual elongation were measured. Based on the actual value of the conventional cross-linked polyolefin resin tube, the tensile strength residual ratio is 60% or more, the elongation residual ratio is 60%.
% Or more was taken as a passing line.
【0021】可とう性 引張り弾性率をJIS K 7113(1981)に準拠
して測定した。従来の軟質塩化ビニル樹脂製チューブと
同等の治具を用い、同様の作業ができる限度である70
0kg/cm2以下を合格ラインとした。The flexible tensile modulus was measured according to JIS K 7113 (1981). It is the limit that the same work can be performed by using a jig equivalent to the conventional soft vinyl chloride resin tube.
The pass line was 0 kg / cm 2 or less.
【0022】[0022]
【表1】 [Table 1]
【0023】[0023]
【表2】 [Table 2]
【0024】[0024]
【表3】 [Table 3]
【0025】表1及び表2から明らかなように、本発明
にかかるゴム組成物を構成材料として使用したチューブ
(実施例1乃至実施例7)は、いずれも、機械的特性:
引張強さ10.4MPa以上、伸び200%以上、高温
耐摩耗性50回以上、耐熱性:引張強さ残率70%以
上、伸び残率65%以上、耐油性:引張強さ残率60%
以上、伸び残率60%以上、可とう性:引張弾性率70
0kg/cm2以下という合格ラインをクリアしてお
り、機械的特性、耐熱性、耐油性及び可とう性をバラン
ス良く兼ね備えている。特に高温耐摩耗性については、
従来品の実力値(50回程度)の2倍から5倍程度であ
り、格段に優れている。As is clear from Tables 1 and 2, the tubes (Examples 1 to 7) using the rubber composition according to the present invention as a constituent material all have mechanical properties:
Tensile strength 10.4 MPa or more, elongation 200% or more, high temperature abrasion resistance 50 times or more, heat resistance: tensile strength residual ratio 70% or more, elongation residual ratio 65% or more, oil resistance: tensile strength residual ratio 60%
Above, elongation residual ratio 60% or more, flexibility: Tensile elastic modulus 70
It has passed the acceptance line of 0 kg / cm 2 or less, and has a good balance of mechanical properties, heat resistance, oil resistance and flexibility. Especially for high temperature wear resistance,
It is about 2 to 5 times the actual value (about 50 times) of the conventional product, which is significantly superior.
【0026】これに対して、水素添加NBRの重量比が
本発明の範囲に満たない比較例1は、高温時の機械的特
性(高温耐摩耗性)と耐油性に劣り、一方、水素添加N
BRの重量比が本発明の範囲を超える比較例2は、耐熱
性(伸び残率)に劣っている。比較例3は、水素添加N
BRの重量比は本発明の範囲内であるものの、残存二重
結合量が本発明の好ましい範囲(1.0%以下)を超え
るものである。これも比較例2と同様に耐熱性(伸び残
率)に劣っている。比較例4は、水素を添加していない
NBRを使用した場合であるが、高温時の機械的特性
(高温耐摩耗性)が著しく劣っているとともに、耐熱性
も大幅に劣り、引張強さ残率及び伸び残率の測定ができ
なかった。On the other hand, Comparative Example 1 in which the weight ratio of hydrogenated NBR is less than the range of the present invention is inferior in mechanical properties (high temperature abrasion resistance) and oil resistance at high temperatures, while hydrogenated NBR is
Comparative Example 2 in which the weight ratio of BR exceeds the range of the present invention is inferior in heat resistance (extension residual rate). Comparative Example 3 is hydrogenated N
Although the weight ratio of BR is within the range of the present invention, the amount of residual double bonds exceeds the preferable range (1.0% or less) of the present invention. This is also inferior in heat resistance (extension residual rate) like Comparative Example 2. Comparative Example 4 is a case where NBR to which hydrogen is not added is used, but mechanical properties at high temperature (high temperature abrasion resistance) are remarkably inferior, heat resistance is also remarkably inferior, and tensile strength remains. The rate and residual elongation could not be measured.
【0027】比較例5乃至比較例7は、結晶性ポリオレ
フィンの密度及び/または曲げ剛性率を本発明の範囲外
としたものである。密度が本発明の範囲に満たない比較
例5は耐油性に劣っている。また、曲げ剛性率が本発明
の範囲を超える比較例6と、密度及び曲げ剛性率の両方
が本発明の範囲を超える比較例7は、それぞれ引張弾性
率が1100kg/cm2、2700kg/cm2を示
しており、可とう性に著しく劣っている。In Comparative Examples 5 to 7, the crystalline polyolefin has a density and / or a flexural modulus outside the range of the present invention. Comparative Example 5 having a density less than the range of the present invention is inferior in oil resistance. Further, the bending of Comparative Example 6 in which the rigidity ratio exceeds the scope of the present invention, the density and Comparative Example 7 in which both the flexural modulus is outside the range of the present invention has a tensile modulus of 1100 kg / cm 2, respectively, 2700 kg / cm 2 , And the flexibility is extremely poor.
【0028】本発明は上記の実施例に限定されものでは
ない。上記の実施例では本発明にかかるゴム組成物をチ
ューブの構成材料として使用したが、各種電線の絶縁体
やシース材として使用することもできる。The present invention is not limited to the above embodiments. Although the rubber composition according to the present invention is used as the constituent material of the tube in the above-mentioned examples, it can also be used as an insulator or sheath material of various electric wires.
【0029】[0029]
【発明の効果】以上詳述したように本発明のゴム組成物
は、耐熱性、耐油性、機械的特性及び可とう性を兼ね備
えるとともに、特に高温時の機械的特性(高温耐摩耗
性)が著しく向上したものである。従って、例えば、自
動車、産業ロボット等で使用される保護チューブや、電
線の絶縁体またはシース材などとして好適である。As described in detail above, the rubber composition of the present invention has heat resistance, oil resistance, mechanical properties and flexibility, and at the same time, the mechanical properties at high temperatures (high temperature abrasion resistance) are This is a marked improvement. Therefore, it is suitable as, for example, a protective tube used in automobiles, industrial robots, etc., or an insulator or sheath material for electric wires.
Claims (4)
共重合体と、無水マレイン酸を含有する結晶性ポリオレ
フィン組成物を40:60〜70:30の重量比で混合
して得られた混合物を主成分とするゴム組成物。1. A mixture containing a hydrogenated acrylonitrile-butadiene copolymer and a crystalline polyolefin composition containing maleic anhydride in a weight ratio of 40:60 to 70:30 as a main component. Rubber composition.
レフィン組成物は、オレフィン−無水マレイン酸共重合
体と、密度0.890g/cm3以上0.920g/c
m3以下、曲げ剛性率900kg/cm2以下の結晶性
ポリオレフィンが混合されたものであることを特徴とす
る請求項1記載のゴム組成物。2. The crystalline polyolefin composition containing maleic anhydride comprises an olefin-maleic anhydride copolymer and a density of 0.890 g / cm 3 or more and 0.920 g / c.
m 3 or less, the bending rubber composition according to claim 1, wherein the modulus 900 kg / cm 2 or less of crystalline polyolefin is one that was mixed.
ム組成物をチューブ状に押出成形し、架橋を施したこと
を特徴とする保護チューブ。3. A protective tube obtained by extruding the rubber composition according to claim 1 or 2 into a tubular shape and crosslinking the same.
ム組成物からなる架橋被覆層が導体外周に設けられてい
ることを特徴とする電線。4. An electric wire, wherein a cross-linking coating layer made of the rubber composition according to claim 1 or 2 is provided on the outer circumference of the conductor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30689795A JP3589256B2 (en) | 1995-10-30 | 1995-10-30 | Rubber composition, protective tube, electric wire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30689795A JP3589256B2 (en) | 1995-10-30 | 1995-10-30 | Rubber composition, protective tube, electric wire |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09124846A true JPH09124846A (en) | 1997-05-13 |
JP3589256B2 JP3589256B2 (en) | 2004-11-17 |
Family
ID=17962582
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30689795A Expired - Fee Related JP3589256B2 (en) | 1995-10-30 | 1995-10-30 | Rubber composition, protective tube, electric wire |
Country Status (1)
Country | Link |
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JP (1) | JP3589256B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998020068A1 (en) * | 1996-11-06 | 1998-05-14 | The Yokohama Rubber Co., Ltd. | Thermoplastic elastomer compositions, hose made by using thermoplastic elastomer composition, and process for the production thereof |
-
1995
- 1995-10-30 JP JP30689795A patent/JP3589256B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998020068A1 (en) * | 1996-11-06 | 1998-05-14 | The Yokohama Rubber Co., Ltd. | Thermoplastic elastomer compositions, hose made by using thermoplastic elastomer composition, and process for the production thereof |
US6166143A (en) * | 1996-11-06 | 2000-12-26 | The Yokohama Rubber Co., Ltd. | Thermoplastic elastomer composition, hose comprising thermoplastic elastomer composition and process of production thereof |
Also Published As
Publication number | Publication date |
---|---|
JP3589256B2 (en) | 2004-11-17 |
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