机械力化学改性胶粉及其与天然橡胶并用胶性能的研究

Study on Mechanochemical Modification of Rubber Powder and Properties of Its Blend with NR

分析胶粉在开炼机上的机械力化学改性,研究改性胶粉/天然橡胶(NR)并用胶的性能。结果表明:在开炼机机械力化学作用下,胶粉胶料的交联网络断裂,橡胶分子链断键而形成自由基,实现胶粉改性;随着胶粉在开炼机上薄通次数的增加,胶粉胶料的橡胶分子链断键而形成的自由基浓度增大,改性胶粉与NR的界面相容性和界面结合性逐渐提升,胶粉在NR中的分散更均匀;改性胶粉胶料与NR形成共交联网络,改性胶粉/NR并用胶的拉伸强度和拉断伸长率显著提高。

The mechanochemical modification of the rubber powder on open mill was analyzed,and the properties of the modified rubber powder/natural rubber(NR)blends were studied.The results showed that,under the mechanochemistry action using an open mill,the crosslinking network of the rubber powder compound was broken apart,the bonds of the rubber molecular chain was broken to form free radicals,and the modification of the rubber powder was achieved.With increase of the run number of the rubber powder on open mill,the free radical concentration of the rubber power compound increased,the interface compatibility and interaction between the modified rubber powder and NR gradually increased,the dispersion of the rubber powder in NR was more uniform,the modified rubber powder compound and NR formed a co-construction network,and the tensile strength and elongation at break of the modified rubber powder/NR blend increased significantly.