JP2003064227A - Epdm composition - Google Patents
Epdm compositionInfo
- Publication number
- JP2003064227A JP2003064227A JP2001257787A JP2001257787A JP2003064227A JP 2003064227 A JP2003064227 A JP 2003064227A JP 2001257787 A JP2001257787 A JP 2001257787A JP 2001257787 A JP2001257787 A JP 2001257787A JP 2003064227 A JP2003064227 A JP 2003064227A
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- Prior art keywords
- epdm
- weight
- parts
- pts
- oil
- 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.)
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Links
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- Vibration Prevention Devices (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、EPDM組成物に関す
る。更に詳しくは、光磁気ディスク用マウント等の成形
材料として好適に用いられるEPDM組成物に関する。FIELD OF THE INVENTION The present invention relates to EPDM compositions. More specifically, the present invention relates to an EPDM composition that is preferably used as a molding material for a magneto-optical disk mount or the like.
【0002】[0002]
【従来の技術】光磁気ディスク(CD、DVD等)用マウント
は、機械の高性能化(高速化)や支持荷重の軽量化に伴な
い、それを支持するゴム材料の低硬度化や高減衰化(高t
anδ化)が求められるようになってきている。このよう
な要求を満足させる材料としては、一般にブチルゴムが
用いられるが、ブチルゴムは高tanδではあるが、硬度
(JIS A)を10以下に迄低下させることは困難である。2. Description of the Related Art Mounts for magneto-optical discs (CDs, DVDs, etc.) are required to have low hardness and high damping of the rubber material that supports them, as the performance (speed) of machines increases and the weight of supporting loads decreases. (High t
An delta conversion) is being demanded. Butyl rubber is generally used as a material that satisfies such requirements. Butyl rubber has a high tan δ
It is difficult to reduce (JIS A) to 10 or less.
【0003】一方、低硬度化という観点からは、EPDM材
は可塑剤を吸収し易いため低硬度化は可能であるが、ポ
リマーの持つ特性としてtanδは低い値しか示さない。
また、樹脂-可塑剤の組合せにより、低硬度-高tanδ化
は可能であるが、この場合には樹脂の多量配合となるた
め、未加硫生地の粘着性、温度依存性の悪化、加硫物の
熱間強度、低温性の低下および振動特性の温度依存性の
悪化など、他の物性とのバランスを図ることが困難であ
る。On the other hand, from the viewpoint of lowering the hardness, the EPDM material can easily lower the hardness because it easily absorbs the plasticizer, but tan δ shows only a low value as a characteristic of the polymer.
Also, low hardness-high tan δ can be achieved by the combination of resin-plasticizer, but in this case, a large amount of resin is mixed, so the tackiness of unvulcanized fabric, deterioration of temperature dependence, vulcanization It is difficult to achieve a balance with other physical properties such as hot strength of the product, deterioration of low temperature property and deterioration of temperature dependency of vibration characteristics.
【0004】[0004]
【発明が解決しようとする課題】本発明の目的は、他の
物性とのバランスを図りつつ、低硬度-高減衰化を達成
せしめるEPDM組成物を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an EPDM composition which achieves low hardness and high damping while balancing with other physical properties.
【0005】[0005]
【課題を解決するための手段】かかる本発明の目的は、
油展EPDM 100重量部(EPDMとして)、数平均分子量Mnが10
000以下のエチレン-α-オレフィン共重合体20〜150重量
部およびエステル系可塑剤10〜150重量部よりなる、イ
オウ系加硫剤によって加硫されるEPDM組成物によって達
成される。The object of the present invention is as follows.
Oil-extended EPDM 100 parts by weight (as EPDM), number average molecular weight Mn is 10
This is achieved by an EPDM composition vulcanized by a sulfur-based vulcanizing agent, which comprises 20 to 150 parts by weight of an ethylene-α-olefin copolymer of 000 or less and 10 to 150 parts by weight of an ester plasticizer.
【0006】[0006]
【発明の実施の形態】油展EPDMとしては、EPDMに対して
の油展量が70〜130重量%、好ましくは100〜120重量%のE
PDMが用いられる。油展量がこの範囲内にないと、硬度
が低下するため、混練時に添加する可塑剤量を増す必要
があり、混練性が悪化するようになる。油展には、石油
系炭化水素(パラフィン系、ナフテン系、アロマ系等)お
よびその水添物、各種石油樹脂等が用いられ、実際には
このような油展量の市販品EPDMをそのまま用いることが
できる。BEST MODE FOR CARRYING OUT THE INVENTION The oil-extended EPDM is E-DM having an oil extension of 70 to 130% by weight, preferably 100 to 120% by weight, based on EPDM.
PDM is used. If the amount of oil spread is not within this range, the hardness decreases, so it is necessary to increase the amount of plasticizer added during kneading, and kneading properties will deteriorate. Petroleum-based hydrocarbons (paraffin-based, naphthene-based, aroma-based, etc.) and hydrogenated products thereof, various petroleum resins, etc. are used for oil extension, and in practice such oil-extended amount of commercial EPDM is used as it is. be able to.
【0007】また、数平均分子量Mnが10000以下の低分
子量エチレン-α-オレフィン共重合体は、油展EPDM中の
ポリマー(EPDM)100重量部当り20〜150重量部、好ましく
は80〜100重量部の割合で用いられる。このような割合
の低分子量エチレン-α-オレフィン共重合体を添加する
ことによりtanδの値は向上し、強度の低下は可塑剤の
添加によって低硬度化した場合よりも少なくなる。The low molecular weight ethylene-α-olefin copolymer having a number average molecular weight Mn of 10,000 or less is 20 to 150 parts by weight, preferably 80 to 100 parts by weight, per 100 parts by weight of the polymer (EPDM) in the oil-extended EPDM. Used in part ratio. By adding the low molecular weight ethylene-α-olefin copolymer in such a proportion, the value of tan δ is improved, and the decrease in strength is less than that in the case where the hardness is reduced by adding the plasticizer.
【0008】低分子量エチレン-α-オレフィン共重合体
の添加量を増加させると、加硫物の粘着性は増加する
が、エステル系可塑剤を併用することによって、粘着性
を有効に抑制することができる。エステル系可塑剤とし
ては、例えばジブチルフタレート、ジ(2-エチルヘキシ
ル)フタレート、ジオクチルフタレート、ジオクチルマ
レエート、ジイソデシルアジペート、アセチルトリ(n-
ブチル)シトレート等が、油展EPDM中のポリマー(EPDM)1
00重量部当り10〜150重量部、好ましくは20〜100重量
部、さらに好ましくは40〜60重量部の割合で用いられ
る。これよりも添加割合が少ないと粘着防止の効果が得
られず、一方これよりも多い割合で用いられると強度低
下が著しくなる。エステル系可塑剤の代りにパラフィン
系可塑剤を用いると、tanδや強度は増加するものの、
粘着性がみられるようになる。When the amount of the low molecular weight ethylene-α-olefin copolymer added is increased, the tackiness of the vulcanizate is increased, but the tackiness is effectively suppressed by the combined use of the ester plasticizer. You can Examples of the ester plasticizer include dibutyl phthalate, di (2-ethylhexyl) phthalate, dioctyl phthalate, dioctyl maleate, diisodecyl adipate, acetyl tri (n-
Butyl) citrate, etc. is a polymer (EPDM) in oil-extended EPDM.
It is used in an amount of 10 to 150 parts by weight, preferably 20 to 100 parts by weight, more preferably 40 to 60 parts by weight, per 00 parts by weight. If it is added in a smaller amount than this, the effect of preventing tackiness cannot be obtained, while if it is used in a larger amount, the strength is significantly reduced. If paraffin plasticizer is used instead of ester plasticizer, tan δ and strength increase, but
It becomes sticky.
【0009】以上の各成分よりなる組成物は、イオウま
たはイオウ供与性化合物(下記加硫促進剤化合物等)によ
って加硫される。これらの加硫剤は、油展EPDM中のポリ
マー(EPDM)100重量部当り0.2〜15重量部、好ましくは1.
5〜8.5重量部の割合で用いられる。これらイオウ系の加
硫剤に代えて、有機パーオキサイド系架橋剤を用いる
と、バリ部分が未加硫であって成形性、非汚染性に劣る
ようになる。The composition comprising the above components is vulcanized with sulfur or a sulfur donating compound (such as a vulcanization accelerator compound described below). These vulcanizing agents are used in an amount of 0.2 to 15 parts by weight per 100 parts by weight of the polymer (EPDM) in the oil-extended EPDM, preferably 1.
It is used in a proportion of 5 to 8.5 parts by weight. When an organic peroxide-based cross-linking agent is used in place of these sulfur-based vulcanizing agents, the burr portion is unvulcanized and the moldability and non-staining property become poor.
【0010】これらの各成分を必須成分とするEPDM組成
物中には、カーボンブラック、ホワイトカーボン等の充
填剤、補強剤、酸化亜鉛等の受酸剤、ステアリン酸等の
滑剤、2-メルカプトベンゾチアゾール、テトラメチルチ
ウラムジスルフィド、ジエチルジチオカルバミン酸金属
塩等の加硫促進剤などが、必要に応じて適宜配合され、
ニーダ、ロール等を用いて混練した後、約170〜190℃で
約1〜3分間程度加熱して加硫される。EPDM compositions containing each of these components as essential components include fillers such as carbon black and white carbon, reinforcing agents, acid acceptors such as zinc oxide, lubricants such as stearic acid, and 2-mercaptobenzo. Vulcanization accelerators such as thiazole, tetramethylthiuram disulfide, metal salt of diethyldithiocarbamic acid, etc. are appropriately blended as necessary,
After kneading using a kneader, roll, etc., it is vulcanized by heating at about 170 to 190 ° C. for about 1 to 3 minutes.
【0011】[0011]
【発明の効果】本発明に係るEPDM組成物から加硫成形さ
れた加硫物は、強度、成形性、加工性、非粘着性を満足
させながら、硬度(JIS A)が10以下でかつtanδ(圧縮条
件下、室温、50Hz)が0.2以上という値を示しており、こ
のような性質を示す加硫物を与える組成物は、光磁気デ
ィスク用マウント等の低荷重支持の防振材の成形材料と
して有効に使用することができる。The vulcanized product obtained by vulcanization molding from the EPDM composition according to the present invention has a hardness (JIS A) of 10 or less and tan δ while satisfying strength, moldability, processability and non-adhesiveness. (Compressed condition, room temperature, 50 Hz) shows a value of 0.2 or more, and the composition giving a vulcanized product showing such properties is a molding of a low load supporting vibration isolator such as a mount for a magneto-optical disk. It can be effectively used as a material.
【0012】[0012]
【実施例】次に、実施例について本発明を説明する。EXAMPLES The present invention will now be described with reference to examples.
【0013】
実施例1
油展EPDM(三井化学製品EPDM3042E; 220重量部
油展オイル120重量部を含む)
低分子量エチレン-α-オレフィン共重合体 100 〃
(三井化学製品ルーカント)
FEFカーボンブラック 5 〃
ホワイトカーボン 35 〃
ZnO2 5 〃
ステアリン酸 1 〃
エステル系可塑剤(ジイソデシルアジペート) 60 〃
イオウ 1.5 〃
促進剤(2-メルカプトベンゾチアゾール) 1 〃
〃 (ジエチルジチオカルバミン酸銅) 2 〃
〃 (ジエチルジチオカルバミン酸亜鉛) 2 〃
以上の各成分をニーダおよびロールを用いて30分間混練
し、混練物を180℃で3分間プレス加硫した。Example 1 Oil-extended EPDM (including Mitsui Chemicals EPDM3042E; 220 parts by weight oil-extended oil 120 parts by weight) Low molecular weight ethylene-α-olefin copolymer 100 〃 (Mitsui Chemicals Lucant) FEF carbon black 5 〃 white carbon 35 〃 ZnO 2 5 〃 stearate 1 〃 ester plasticizer (diisodecyl adipate) 60 〃 sulfur 1.5 〃 accelerator (2-mercaptobenzothiazole) 1 undefined undefined (diethyldithiocarbamate copper) 2 undefined undefined (diethyldithiocarbamate Zinc) 2 〃 Each of the above components was kneaded for 30 minutes using a kneader and a roll, and the kneaded material was press-vulcanized at 180 ° C for 3 minutes.
【0014】加硫物について、次の各項目の測定および
評価を行った。
硬度(JIS A):JIS K-6251準拠
引張強さ:JIS K-6253準拠
伸び:JIS K-6253準拠
減衰(tanδ):圧縮条件下、室温、50Hzで測定
成形性:離型可能であり、バリの粘着がないものを〇、
そうではないものを×と評価
加工性:混練時間が30分以内であり、加硫時間(T90値)
が180℃、3分以内のものを〇、そうではないものを×と
評価
非汚染性:粘着性が少なく、ABS樹脂(マウント取付部分
の板として使用)を汚染しないものを〇、そうではない
ものを×と評価With respect to the vulcanized product, the following items were measured and evaluated. Hardness (JIS A): JIS K-6251 compliant Tensile strength: JIS K-6253 compliant Elongation: JIS K-6253 compliant Attenuation (tanδ): Measured under compression conditions at room temperature and 50 Hz Formability: Releasable, If there is no burr stickiness,
If not, it is evaluated as x. Workability: Kneading time is within 30 minutes, vulcanization time (T 90 value)
Is 180 ° C for 3 minutes or less, and is not rated as x. Non-staining: 〇 if it has low adhesiveness and does not contaminate ABS resin (used as a plate for mount mounting). Things are rated as x
【0015】実施例2
実施例1において、そこで用いられたイオウおよび促進
剤の代りに、次の3種類の促進剤(いずれも当該成分45%
配合のマスターバッチ)が用いられた。
促進剤(4,4′-ジチオジモルホリン) 3.7重量部
〃 (テトラメチルチウラムジスルフィド) 3.7 〃
〃 (ジエチルジチオカルバミン酸テルル) 1.2 〃Example 2 In Example 1, the sulfur and the accelerator used therein were replaced with the following three types of accelerators (all containing 45% of the component concerned).
A compounding masterbatch) was used. Accelerator (4,4′-dithiodimorpholine) 3.7 parts by weight 〃 (tetramethylthiuram disulfide) 3.7 〃 〃 (tellurium diethyldithiocarbamate) 1.2 〃
【0016】比較例1
実施例1において、そこで用いられたイオウおよび促進
剤の代りに、ジクミルパーオキサイド3.2重量部が用い
られた。Comparative Example 1 In Example 1, 3.2 parts by weight of dicumyl peroxide were used in place of the sulfur and accelerator used therein.
【0017】比較例2
実施例1において、エステル系可塑剤の代りに、同量の
パラフィン系可塑剤(出光興産製品PW380)が用いられ
た。Comparative Example 2 In Example 1, instead of the ester plasticizer, the same amount of paraffin plasticizer (PW380 manufactured by Idemitsu Kosan Co., Ltd.) was used.
【0018】以上の各実施例および比較例における測定
および評価結果は、次の表に示される。
表 測定・評価項目
実-1 実-2 比-1 比-2
硬度(JIS A) 8 8 - 8
引張強さ (MPa) 4.2 6.0 - 4.2
伸び (%) 1200 1200 - 1200
減衰(tanδ) 0.28 0.28 - 0.32
成形性 〇 〇 × 〇
加工性 〇 〇 〇 〇
非汚染性 〇 〇 × ×The measurement and evaluation results in each of the above Examples and Comparative Examples are shown in the following table. Table Measurement / evaluation items Actual-1 Actual-2 Ratio-1 Ratio-2 Hardness (JIS A) 8 8-8 Tensile strength (MPa) 4.2 6.0-4.2 Elongation (%) 1200 1200-1200 Attenuation (tanδ) 0.28 0.28 -0.32 Formability 〇 〇 × 〇 Workability 〇 〇 〇 〇 Non-contaminating 〇 〇 × ×
フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) F16F 15/02 F16F 15/02 Q G11B 25/04 101 G11B 25/04 101L 33/08 33/08 E Fターム(参考) 3J048 AA01 BD04 4F070 AA13 AA16 AA63 AB11 AB16 AC43 GA06 GC01 4J002 AE05X BB05Y BB15W DA047 EH096 EH146 FD026 FD147 GM00 GQ00 GS00 GT00 Front page continuation (51) Int.Cl. 7 Identification code FI theme code (reference) F16F 15/02 F16F 15/02 Q G11B 25/04 101 G11B 25/04 101L 33/08 33/08 EF term (reference) ) 3J048 AA01 BD04 4F070 AA13 AA16 AA63 AB11 AB16 AC43 GA06 GC01 4J002 AE05X BB05Y BB15W DA047 EH096 EH146 FD026 FD147 GM00 GQ00 GS00 GT00
Claims (4)
均分子量Mnが10000以下のエチレン-α-オレフィン共重
合体20〜150重量部およびエステル系可塑剤10〜150重量
部よりなる、イオウ系加硫剤によって加硫されるEPDM組
成物。1. An oil-extended EPDM comprising 100 parts by weight (as EPDM), 20 to 150 parts by weight of an ethylene-α-olefin copolymer having a number average molecular weight Mn of 10,000 or less, and 10 to 150 parts by weight of an ester plasticizer. EPDM composition vulcanized by a sulfur-based vulcanizing agent.
EPDMが用いられた請求項1記載のEPDM組成物。2. An oil extension of 70 to 130% by weight based on EPDM.
The EPDM composition according to claim 1, wherein EPDM is used.
された光磁気ディスク用マウント。3. A magneto-optical disk mount vulcanized from the EPDM composition according to claim 1.
件下、室温、50Hz)が0.2以上である請求項3記載の光磁
気ディスク用マウント。4. The mount for a magneto-optical disk according to claim 3, which has a hardness (JIS A) of 10 or less and a tan δ (room temperature under compression condition, 50 Hz) of 0.2 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001257787A JP2003064227A (en) | 2001-08-28 | 2001-08-28 | Epdm composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001257787A JP2003064227A (en) | 2001-08-28 | 2001-08-28 | Epdm composition |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003064227A true JP2003064227A (en) | 2003-03-05 |
Family
ID=19085397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001257787A Pending JP2003064227A (en) | 2001-08-28 | 2001-08-28 | Epdm composition |
Country Status (1)
Country | Link |
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JP (1) | JP2003064227A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007060843A1 (en) * | 2005-11-25 | 2007-05-31 | Mitsui Chemicals, Inc. | Process oil composition, oil extended elastomer containing same, and olefin thermoplastic elastomer composition |
JP2009264483A (en) * | 2008-04-24 | 2009-11-12 | Polymatech Co Ltd | Shock absorbing member |
GB2526415A (en) * | 2014-03-28 | 2015-11-25 | Toyoda Gosei Kk | Rubber material and seal component and hose |
US9434836B2 (en) | 2013-07-25 | 2016-09-06 | Nok Corporation | EPDM composition for torsional damper |
JP2020117713A (en) * | 2015-11-30 | 2020-08-06 | 株式会社ブリヂストン | Rubber composition |
-
2001
- 2001-08-28 JP JP2001257787A patent/JP2003064227A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007060843A1 (en) * | 2005-11-25 | 2007-05-31 | Mitsui Chemicals, Inc. | Process oil composition, oil extended elastomer containing same, and olefin thermoplastic elastomer composition |
US8318846B2 (en) | 2005-11-25 | 2012-11-27 | Mitsui Chemicals, Inc. | Process oil composition, oil-extended elastomer containing the same and olefin-based thermoplastic elastomer composition |
JP2009264483A (en) * | 2008-04-24 | 2009-11-12 | Polymatech Co Ltd | Shock absorbing member |
US9434836B2 (en) | 2013-07-25 | 2016-09-06 | Nok Corporation | EPDM composition for torsional damper |
GB2526415A (en) * | 2014-03-28 | 2015-11-25 | Toyoda Gosei Kk | Rubber material and seal component and hose |
GB2526415B (en) * | 2014-03-28 | 2018-11-14 | Toyoda Gosei Kk | Rubber material and seal component and hose |
JP2020117713A (en) * | 2015-11-30 | 2020-08-06 | 株式会社ブリヂストン | Rubber composition |
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