| EPDM, a terpolymer, is composed of ethylene, propylene and the third monomer(non conjugated dien). As the backbone of fully saturated, EPDM has excellentresistance to ozone and weather resistance, excellent heat resistance and electricalinsulation property. So it is widely used in automobile, electric wire and cable and soon. But the double bond content of EPDM is low, and it is short of polar groups. Thencuring speed, mechanical properties, self-adhesive and mutual viscosity of EPDM arepoor. Chlorinated polyethylene (CPE) has excellent chemical properties, high filling,and low prices. EPDM/CPE blends can reduce the production cost, improve themechanical properties and flame retardant properties of EPDM.This paper studied the properties of EPDM/CPE blends in the blend ratio,vulcanization system and reinforcing system. EPDM was modified in chemical method,and EPDM-g-MAH and EPDM-g-Br were prepared. The property evolution ofEPDM/CPE blends was studied with addition of modified EPDM. The compatibility ofEPDM/CPE blends was studied by scanning electron microscopy (SEM), dynamicmechanical analyzer (DMA) and differential scanning calorimetry (DSC).The results showed that EPDM/CPE blends had better compatibility. The additionof CPE could effectively improve the processing performance and mechanicalproperties of EPDM, and reduce the production cost of EPDM products. Thevulcanization speed of EPDM/CPE blends was accelerated with addition of modifiedEPDM. The amount of vulcanization agent had a certain effect on the properties ofEPDM/CPE vulcanization. The co-vulcanization characteristic EPDM/CPE blends was improved by prevulcanization process. Carbon black with silica had better reinforcingeffect for EPDM/CPE blends. But it should pay attention to the proportion and addingsequence of strengthening agent. |
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