JPH0417223B2 - - Google Patents
Info
- Publication number
- JPH0417223B2 JPH0417223B2 JP16885283A JP16885283A JPH0417223B2 JP H0417223 B2 JPH0417223 B2 JP H0417223B2 JP 16885283 A JP16885283 A JP 16885283A JP 16885283 A JP16885283 A JP 16885283A JP H0417223 B2 JPH0417223 B2 JP H0417223B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- weight
- rubber
- parts
- nbr
- 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.)
- Expired
Links
- 229920001971 elastomer Polymers 0.000 claims description 25
- 239000005060 rubber Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims 1
- 239000003921 oil Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000010734 process oil Substances 0.000 description 2
- 239000010692 aromatic oil Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】
本発明はシール用ゴム組成物に関し、更に詳し
くは自己潤滑性の良好なシール用ゴム組成物に関
するものである。
従来、ゴム材製シール部材の摩擦係数を低下さ
せる目的で、ゴム材中に油を混入する方法が提案
されている。
しかし、合成ゴムのうちNBRは油との相溶性
が悪いため、NBR中に多量の油を含有させるこ
とは困難であつた。
そこで本発明は油との相溶性が良いEPラバー
に油を含ませ、これをNBR中に混合することに
より、NBR中に多量の油を含有させることを可
能とするとともに、油のブリードを押え長時間油
をNBR中に保持できるゴム組成物としたもので
ある。
油としてはパラフイン系、ナフテン系、アロマ
チツク系が単独あるいは混合して用いられる。
EPラバーの粉体はEPラバーの加硫物を適当な方
法で粉末化したものが用いられている。
本発明は、EPラバーの加硫物の粉体に対し油
を混入した含油ゴム粉をNBR100重量部に対し10
重量部以上配合したシール用ゴム組成物である。
実施例 １
ASTM No.３ OIL20重量部とEPラバーの加
硫物の粉体５重量部を混合し、ついで、この含油
ゴム粉をNBR100重量部に混合した。
ついで、このゴム組成物を180℃，４分で加硫
成形した。
比較例 １
ASTM No.３ OIL20重量部をNBR100重量部
に混合した。
ついで、このゴム組成物を180℃，４分で加硫
成形した。
実施例 ２
プロセスオイル20重量部とEPラバーの加硫物
の粉体５重量部を混合し、ついでこの含油ゴム粉
をNBR100重量部に混合した。
ついで、このゴム組成物を180℃，４分で加硫
成形した。
比較例 ２
プロセスオイル20重量部をNBR100重量部に混
入した。
ついで、このゴム組成物を180℃，４分で加硫
成形した。
上記各実施例及び比較例で得られた加硫成形品
の油のブリード量を測定した結果を表に示した。
表から明らかな様に、EPラバー粉体を混入し
たものは混入しないものに比べブリード量が少な
く、油の保持能力がよいことが判る。含油ゴム粉
は通常EPラバー粉体100重量部に対し100重量部
以上の油を混入したものが用いられる。
尚、本発明で使用されるNBRはシール材とし
て適した様に各種の充填剤が予め配合されてい
る。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rubber composition for seals, and more particularly to a rubber composition for seals with good self-lubricating properties. Conventionally, a method of mixing oil into a rubber material has been proposed for the purpose of lowering the friction coefficient of a rubber seal member. However, among synthetic rubbers, NBR has poor compatibility with oil, so it has been difficult to incorporate a large amount of oil into NBR. Therefore, the present invention impregnates oil into EP rubber, which has good compatibility with oil, and mixes it into NBR, thereby making it possible to contain a large amount of oil in NBR and suppressing oil bleed. It is a rubber composition that can retain oil in NBR for a long time. As the oil, paraffinic, naphthenic, and aromatic oils may be used alone or in combination.
The EP rubber powder used is a vulcanized product of EP rubber that is powdered using an appropriate method. In the present invention, oil-impregnated rubber powder mixed with oil is added to the EP rubber vulcanizate powder at a rate of 10% by weight per 100 parts by weight of NBR.
This is a rubber composition for seals containing at least part by weight. Example 1 20 parts by weight of ASTM No. 3 OIL and 5 parts by weight of EP rubber vulcanizate powder were mixed, and then this oil-impregnated rubber powder was mixed with 100 parts by weight of NBR. This rubber composition was then vulcanized and molded at 180°C for 4 minutes. Comparative Example 1 20 parts by weight of ASTM No. 3 OIL was mixed with 100 parts by weight of NBR. This rubber composition was then vulcanized and molded at 180°C for 4 minutes. Example 2 20 parts by weight of process oil and 5 parts by weight of EP rubber vulcanizate powder were mixed, and then this oil-impregnated rubber powder was mixed with 100 parts by weight of NBR. This rubber composition was then vulcanized and molded at 180°C for 4 minutes. Comparative Example 2 20 parts by weight of process oil was mixed into 100 parts by weight of NBR. This rubber composition was then vulcanized and molded at 180°C for 4 minutes. The results of measuring the amount of oil bleed of the vulcanized molded products obtained in each of the above Examples and Comparative Examples are shown in the table. As is clear from the table, the amount of bleed is smaller in the case where EP rubber powder is mixed in compared to the case where it is not mixed in, indicating that the oil holding capacity is better. Oil-impregnated rubber powder is usually one in which 100 parts by weight or more of oil is mixed with 100 parts by weight of EP rubber powder. Note that the NBR used in the present invention is pre-blended with various fillers so that it is suitable as a sealing material. 【table】
Claims (1)
含油ゴム粉をNBR100重量部に対し10重量部以上
配合してなるシール用ゴム組成物。1. A sealing rubber composition comprising 10 parts by weight or more of oil-impregnated rubber powder mixed with oil and EP rubber vulcanizate powder per 100 parts by weight of NBR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16885283A JPS6060141A (en) | 1983-09-13 | 1983-09-13 | Sealing rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16885283A JPS6060141A (en) | 1983-09-13 | 1983-09-13 | Sealing rubber composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6060141A JPS6060141A (en) | 1985-04-06 |
| JPH0417223B2 true JPH0417223B2 (en) | 1992-03-25 |
Family
ID=15875738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16885283A Granted JPS6060141A (en) | 1983-09-13 | 1983-09-13 | Sealing rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6060141A (en) |
-
1983
- 1983-09-13 JP JP16885283A patent/JPS6060141A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6060141A (en) | 1985-04-06 |
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