The Special Material For PE Heating Pipe

The special material for PE heating pipe that this article researched uses high quality polyethylene produced by Daqing Petro-Chemical Corporation as raw materials. Two-step silane crosslinking method makes PE to form a three-dimensional cross-linked network structure. Two steps are for preparing for granulated silane-grafted polyethylene material(material A)and the mother grain of the catalyst for condensation reaction(material B). Mixing materials A and B in specific ration then extruding and molding the mixed materials,pipe manufacturer can produce cross-linked polyethylene pipe. This article,through the analysis for the properties and structures of different high-density polyethylene produced by Daqing Petro-Chemical Corporation,has determined the base resin suitable for silane crosslinking. By adding free radical catching agent,effectively controls the carbon-carbon macromolecule's silane grafting. Adopting the cross design determines the optimal recipe of the special material for PE heating pipe. By adjusting the screw speed of the twin-screw extruder,temperatures of different heating stages,the optimal processing conditions for grafting reactions are determined. Under those conditions,the special material for PE heating pipe are produced according to the optimal recipe. The technical indices meet the functional requirements of the heating pipe as examined,and the gel rate exceeds 65%. The special material for PE heating pipe that this article researched has been used to produce floor-heating pipes by Daqing Fenghua Branch of China Plastic Products Co,Ltd,Qingdao Furuixin New Building Material and Cross-linked Pipe Material Co,Ltd,and Jinan Huruiyuan Cross-linked Pipe Material Co.,Ltd. As examined and tested,all performance indices met the requirement of heating pipe,and the material passed the 1000h pressure test. The material has been given favorable comments by the users and the industrial application has been successful.