Research On The Structure, Properties And Blending Technology Of Chlorinated Polyethylene Rubber And Ternary Nylon Blends

This paper mainly introduce our job on the investigation about the compatibility, mechanical properties, thermal behavior, rheological properties, oil resistance, repeated processing properties and microstructure of the CPE / PA blends, together with the determination of blend process conditions.Theoretical and experimental data show that the CPE and the PA are compatible in the technique. By researching some experimental analysis such as capillary rheology, FTIR, DSC, phase contrast microscopy and scanning electron microscopy analysis, it is found that the two-phase system have interaction as result of Tg being closer to each other. There is a certain degree of micro-chemistry reaction at the interface between the PA phase and CPE phase. The rheological analysis results show that the CPE improve PA's "temperature sensitive" and the PA processing performance. TG analysis results reveal that both of the two phases could enhance the thermal stability individually, the two initial decomposition temperature both rising.In addition, the article also details the preparation of CPE/PA blends by use of Haake torque rheometer. The optimized conditions were: initial mixing temperature of 150℃, the rotor speed 50-60r/min, mixing Time 7-8min. The properties of CPE improved significantly, but the flexibility of the corresponding blends decreased such as increasing permanent deformation.During the curing process, we investigate two kinds of curing system. One is mixing on the mill and the other one is pre-blending on the mill, and then completing by Haake dynamic vulcanization. The optimization of curing conditions in Haake torque rheometer: the initial temperature of 150℃, speed 65rpm, mixing time 7 ~ 8min or so. And process the blends prepared through the dynamic vulcanization performs good mechanical properties and oil resistance. Peroxide and thiadiazole cure system compared to peroxide curing system has better physical and mechanical properties. As curing agent, DCP in the dynamically vulcanized system accounts for that in the static vulcanization dosage amount of 25 to 30 percent of the optimal dosage of 0.7. Under the appropriate blend ratio the blends can be repeated with good workability and the compatibilizer CPE-G-MAH could efficiently improve the properties of the blend.