| Study on Properties of EPDM Water Swellable Rubber |
| Received:September 20, 2019 Revised:September 25, 2019 |
| DOI：10.12136/j.issn.1000-890X.2021.05.0351 |
| Key Words: water swellable rubber；EPDM；silica；paraffin oil；water absorbent resin；water absorbent additive |
| Author Name | Affiliation | E-mail | | Yang Qianyong | Qingdao University of Science and Technology | 1831799406@qq.com | | LYU Tongce | Shandong Laiyang Changyu Sealing Products Co.，Ltd | | | Kang Le | Qingdao University of Science and Technology | | | Fan Wenli | Qingdao University of Science and Technology | | | Zhang Baogang | Qingdao University of Science and Technology | | | Liu Li* | Qingdao University of Science and Technology | 1119311052@qq.com |
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| Abstract: |
| The effects of the amount of silica，paraffin oil，water-absorbing resin and water-absorbing
additive ZA on the properties of ethylene propylene rubber（EPDM） water swellable rubber were studied. The
results showed that，when paraffin oil was used to improve the processing properties of the compound，it was
necessary to add more than 20 phr of silica，otherwise the vulcanizate was difficult to absorb water. Excessive
amount of paraffin oil would reduce the water absorption rate and saturated water absorption ratio of the
vulcanizates，so the amount of paraffin oil should not exceed 50 phr. When the amount of water-absorbing
resin was less than 30 phr，the water absorption rate and saturated water absorption ratio of the vulcanizates
were reduced. When the amount of water-absorbing resin was more than 50 phr，the water absorption rate of
the vulcanizates was improved. The higher the amount of water absorbent resin was，the larger the saturated
water absorption ratio of the vulcanizate was，but the tensile strength was reduced at the same time. The
addition of water absorbent additive ZA could speed up the water absorption rate of the vulcanizate. The
higher the amount of water absorbent additive ZA was，the faster the water absorption rate of the vulcanizate
was. The addition of 15 phr water absorbent additive ZA could improve the saturated water absorption rate
of the vulcanizate，and when the amount of ZA exceeded 15 phr，the saturated water absorption ratio of the
vulcanizate changed little. |
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