微波辐射凝固天然橡胶的性能研究

摘要

A new coagulation method,that is microwave radiation coagulation ( MRC ), and traditional coagulation methods were used to coagulate natural rubber and then compared properties of the rubbers. Suitable laboratory microwave coagulation conditions were explored by orthogonal test. Microwave radiation coagulation natural rubber (NR - m) , acid coagulation natural rubber (NR - a) and natural coagulation natural rubber (NR- n)were prepared and their properties were studied, the results showed that,as to the physical and chemical properties,nitrogen content of NR- m are much higher than NR - a and NR - n, initial plasticity of NR - m is higher than NR - a. As to physical and mechanical properties, stretching stress and tensile strength of NR - m are higher than NR - a before aging, while tensile strength retention after aging of NR- m is lower than NR- a,but relatively higher than NR ~ n. As to the curing behaviors, vulcanization induction time of NR - m is shorter than either NR -a and NR - n, while maximum torque and curing rate are much higher.%采用新型微波辐射凝固法凝固天然橡胶,并与传统天然橡胶凝固方法作比较,对其性能进行了全面研究.通过正交实验探索了实验室微波辐射凝固的适宜工艺条件.对比了微波辐射凝固胶(NR - m)、酸凝固胶(NR-a)和自然凝固胶(NR -n)的性能,结果表明,在理化性能方面,NR-m的氮含量比NR-a和NR-n高,塑性初值比NR-a高；在物理机械性能方面,NR -m硫化胶老化前的定伸应力和拉伸强度比NR-a高,老化后的拉伸强度保持率比NR-a低,但比NR-n高；在硫化特性方面,NR -m的硫化诱导时间比NR-a和NR-n的短,最大转矩和硫化速度更高.