Formulation Design of Semi-Rigid PVC Insulation for Ultra-Fine Robot Cables

In order to satisfy high-reliability requirements for insulation materials of ultra-fine cables used in industrial robots under extreme environments, a systematic formulation scheme for semi-rigid polyvinyl chloride (PVC) insulation materials was explored. To address deficiencies of traditional materials in terms of wide temperature range adaptability, bending resistance, and cost, a formulation based on high-polymerization PVC was proposed. Low-temperature toughness and electrical properties were optimized by introducing polyolefin elastomer (POE) 8150, and a three-dimensional network was constructed by adopting trimethylolpropane trimethacrylate (TMPTMA) irradiation cross-linking technology, through which long-term temperature resistance level was elevated to 105 ℃. Through comprehensive performance validation, applicable temperature range of the developed material was extended to −35~105 ℃, volume resistivity was enhanced to 5.0×10¹⁴ Ω·cm, and a bending life of over 20 million cycles was achieved. While a performance breakthrough was realized by the material, a cost advantage was simultaneously maintained, and a reliable solution was provided for high-safety and long-life ultra-fine robot cables.