| Optimization of Key Properties of Wear Resistant NBR Sealing Product |
| Received:July 20, 2021 Revised:July 20, 2021 |
| DOI：10.12136/j.issn.1000-890X.2022.09.0697 |
| Key Words: NBR；wear resistant sealing product；optimized formulua；surface treatment；material composite；crosslinking density；compression set；friction coefficient |
| Author Name | Affiliation | E-mail | | ZHU Xiaotian* | Zhuzhou Times New Material Technology Co.，Ltd | zhuxt1@csrzic.com | | LYU Xiufeng | BOGE Rubber & Plastics（Zhuzhou） Co.，Ltd | | | ZHANG Baosheng3 | Hunan Honghui Technology Co.，Ltd | | | GUO Chunjie | BOGE Rubber & Plastics（Zhuzhou） Co.，Ltd | |
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| Abstract: |
| The key properties of the wear resistant nitrile butadiene rubber（NBR） sealing product were
optimized from three aspects：compound formulation，surface treatment and material composite modification.
The results showed that，when 4，4′ -dithiodimorphine（DTDM） was used alone as the vulcanizing agent，
the vulcanization time of the NBR compound was long and the compression set was large. When sulfur
and vulcanizing agent DTDM were blended as the vulcanizing agent，with the increase of sulfur content，
the vulcanization speed of the NBR compound increased，the crosslinking density were improved，and
the compression set first decreased and then increased.The optimized formula of the NBR compound was
as follows：NBR 100，zinc oxide 5，stearic acid 1，carbon black N330 60，accelerator TBBS 1.5，
vulcanizing agent DTDM 1.5，sulfur 0.5. On the other hand，spraying the anti-wear polyurethane coating
on the surface of the NBR compound could not substantially reduce its friction coefficient，but spraying the
anti-wear polyurethane coating on the surface of the NBR sealing product could reduce the risk of wear of
the product at the initial stage of assembly.Moreover，the NBR compound composited with polyester cord
or viscose fiber cord could improve its wear resistance. The friction coefficient of the polyester cord/NBR
composite was lower，which was 44.04% lower than that of the viscose fiber/NBR composite，and 45.72%
lower than that of the NBR compound without the anti-wear polyurethane coating. |
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