利用超临界二氧化碳流体制备丁基再生胶的研究

Study on Reclaimed IIR Prepared by Supercritical Carbon Dioxide

利用超临界二氧化碳流体对硫黄硫化丁基橡胶(IIR)进行脱硫制备丁基再生胶(RIIR),分别利用硫黄和树脂硫化体系对RIIR/IIR并用胶进行再硫化,并对其性能进行研究。结果表明:当脱硫反应条件为反应温度180℃、压力14.1MPa、时间120min、脱硫剂DD用量占IIR硫化胶的8%时,RIIR中溶胶组分质量分数为0.985。采用硫黄和树脂硫化RIIR/IIR并用胶,随着RIIR用量的增大,并用胶的转矩减小,焦烧时间和硫化时间延长;纯RIIR不能被硫黄硫化,但能被树脂硫化;并用胶的气体阻隔性能和热稳定性不受影响;树脂硫化并用胶的物理性能比硫黄硫化并用胶好。

Reclaimed IIR （RIIR） was prepared from sulfur-cured IIR by using supercritical carbon dioxide. The reclaimed IIR （RIIR）/IIR blends was revulcanized by adopting sulfur and resin vulcaniza- tion system respectively, and their properties were investigated. The results showed that, when the temperature was 180℃ ,pressure was 14.1 MPa,devulcanization time was 120 min,and mass fraction of diphenyl disulfide in IIR vulcanizate was 8%, the mass fraction of sol component in RIIR could reach 0. 985. With the increase of RIIR content, the torque of RIIR/IIR blends vulcanized by sulfur and resin vulcanization system decreased, and the scorch time and vulcanization time extended. The pure RIIR could not be vulcanized by sulfur, but could be vulcanizated by resin vulcanization system. The gas barrier property and thermal stability of the blends were not affected by the addition level of RIIR. The physical properties of vulcanization system blends vulcanized by resin were better than those vul- canized by sulfur.