| Study on Hot Pressing Process of TPU Material |
| Received:June 04, 2021 Revised:June 04, 2021 |
| DOI：10.12136/j.issn.1000-890X.2022.05.0380 |
| Key Words: TPU；hot pressing；rheological curve；rapid cooling；yellowing；physical property |
| Author Name | Affiliation | E-mail | | CHEN Bingyong* | Hubei Insititute of Aerospace Chemical Technology | 15071533769@139.com | | DING Ning | Hubei Insititute of Aerospace Chemical Technology | | | LIU Jun | Hubei Insititute of Aerospace Chemical Technology | | | HAN Shen | Hubei Insititute of Aerospace Chemical Technology | | | LIN Chunmei | Hubei Insititute of Aerospace Chemical Technology | | | LI Bin | Hubei Insititute of Aerospace Chemical Technology | |
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| Abstract: |
| The hot pressing process of thermoplastic polyurethane（TPU） material was introduced，and the property changes of TPU material before and after hot pressing were compared and analyzed. The results showed that，the hot pressing temperature of TPU material could be determined according to its rheological curve and should be between its softening temperature and viscous flow temperature，which was determined as 140～165 ℃ in this study. During hot pressing，some soft segments of TPU molecules were
prone to degradation and chain breaking due to the influence of thermal oxygen environment，which led to the reduction of the molecular weight，early yellowing and decrease of the physical properties of the TPU material. These phenomena could be significantly reduced by rapid cooling method after hot pressing. |
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