เทอร์โมพลาสติกอิลาสโตเมอร์จากยางรีไซเคิลจากเศษถุงมือยางธรรมชาติกราฟต์มาลิอิกแอนไฮไดร์ดผสมกับพอลิพรอพิลีน

Abstract

Recycled rubber (RR) from waste of natural rubber gloves was prepared via thermo-mechanical de vulcanization using DPDS as de-vulcanizing aids. After de- vulcanization, the recycled rubber has higher sol fraction and lower crosslink density than that of the untreated one. The de-vulcanization efficiency was then analyzed by Horikx's method and found that the random scission or non-selective breakdown of the rubber network, both main chain and crosslink scissions occurred in the de-vulcanization. Influence of sulfur content and accelerator ratio was investigated. Tensile strength increased with the sulfur content up to 1.5 phr while elongation at break decreased with increasing sulfur content. Moreover, the decreased trends of the mechanical properties were found after aging. Then, influnence of two accelerators: TBBS and TMTD ratio have been studied. It was found that the tensile strength and elongation at break decreased with increaseing TMTD ratio. The results showed that using sulfur at 1.5 phr and 0.8/0 phr of TBBS/TMTD ratio gave the best mechanical properties (both before and after heat aging). Effect of maleic anhydride (MA) loading level on cure charateristic and physical properties of recycled rubber was also studied. Increasing MA content resulted in an increase of vulcanization time however, decreases maximum torque and mechanical properties. Thermoplastic vulcanizates (TPVs) based on RR/PP blends via dynamic vulcanization were then prepared using internal mixer Various types of modifiers: MA, TESPT, SP-1055 and PDA were used and MA is found to be the rheological level wa properties of RR/PP TPVs. Moreover, effect of MA loading was found that the mechanical and rheological properties of with increasing MA content and reached a maximum value at MA Effect of various blend ratios of RR/PP and mixing temperature on tent 80 TPVs were also investigated. It was found that the RR/PP TPVs with a of 60/40 by weight and using mixing temperature of 170°C exhibited the best Finally, the investigation of recycle ability of RR/PP TPVS was studied. Results the decreasing trend of mechanical and rheological properties with increasing number of recycled times.