密度和黏结性可控的PE/POE/CaCO3体系颗粒流道调整剂的制备

采用聚乙烯（PE）、聚烯烃弹性体（POE）和碳酸钙（CaCO₃）共混制备了聚合物类颗粒流道调整剂，考察了不同CaCO₃含量和PE与POE比例条件下的PE/CaCO₃、POE/CaCO₃、PE/POE/CaCO₃三类颗粒流道调整剂的密度、熔点熔程、黏结性能、力学性能差异。结果表明，颗粒流道调整剂的密度随CaCO₃含量增加而增大，实现了1.05~1.20 g/cm³范围内可调；结合PE的熔融特性和POE的黏结性能，实现了黏结性能由PE/CaCO₃共混物熔融黏结转为POE/CaCO₃、PE/POE/CaCO₃体系软化黏结的可控调节；通过调节CaCO₃含量、PE与POE比例可以改变流道调整剂颗粒的熔点熔程和拉伸强度，相同CaCO₃含量时PE/POE/CaCO₃体系颗粒的拉伸强度随PE含量升高而增大。

Preparation of PE/POE/CaCO3 Composites Particles as Channel Flow Regulator with Adjustable Density and Adhesion

A series of polyethylene (PE)/polyolefin elastomer (POE)/CaCO₃ blending particles were prepared as a channel flow regulator for the fractured?vuggy carbonate reservoir, and the effects of CaCO₃ content and PE/POE mass ratio on the density, adhesion, melting behavior and tensile strength of the blending particles were investigated. The results indicated that the density of the channel flow regulator increased with an increase of CaCO₃ content, and the addition of CaCO₃ could meet the requirement for the adjustment of density from 1.05 to 1.20 g/cm³. The PE/POE blending particles with different contents of CaCO₃ varied from melting adhesion to softening adhesion by a combination of the relatively high temperature melting behavior of PE and the good adhesion property of POE. The melting temperature range and tensile strength of PE/POE/CaCO₃ composites were also easily manipulated by the CaCO₃ content and PE/POE mass ratio. However, the tensile strength of PE/POE/CaCO₃ composites was found to increase with an increase of PE content at the same CaCO₃ content.