不同温度下天然橡胶中挥发性有机化合物的释放

Release of volatile organic compounds from natural rubber at different temperatures

通过静态顶空与气相色谱-质谱联用的方法,探讨了不同温度(80℃和130℃)和不同硫化温度(130,140,150℃)对两种天然橡胶(SVR 3 L和SPR 10;)中挥发性有机化合物(VOCs)的影响。结果表明,130℃下,两种天然橡胶中的主要VOCs均能挥发并被检出,SVR 3 L中的VOCs主要是乙醇和乙酸;SPR 10;中除乙醇和乙酸外,主要为醛类物质。硫化温度对两种天然橡胶中VOCs总量的影响不大,说明硫化过程中的高温高压条件可使天然橡胶中的VOCs挥发,硫化胶中的VOCs主要来源于硫化促进剂的热分解产物。

The effects of different temperatures(80℃and 130℃)and different vulcanization temperatures(130℃,140℃,and 150℃)on volatile organic compounds(VOCs)of two natural rubbers(SVR 3L and SPR 10;)were investigated by static headspace coupled with gas chromatography-mass spectrometry.The results showed that VOCs in the two natural rubbers could be volatilized and detected at 130℃,and the VOCs in SVR 3 L were mainly ethanol and acetic acid,while the VOCs in SPR 10;were mainly aldehydes besides ethanol and acetic acid.Different vulcanization temperatures had little effect on total volatile organic compounds in the two natural rubbers,indicating that the high temperature and high pressure conditions in the vulcanization process could cause the volatilization or reaction of VOCs,and the VOCs of vulcanization rubber mainly came from the thermal decomposition products of vulcanization accelerators.