Modified fluorine-containing rheological agent for pipe material and use thereof

Abstract

The invention relates to a modified fluorine-containing rheological agent for a pipe material. The modified fluorine-containing rheological agent is a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer grafted with a polar monomer and has a structural formula shown in the description. In the formula, Graft represents a polar monomer, M represents the molecular weight of the polar monomer, the sum of 100n, 150p, 64m and Mq is equal to 100, 100n is in a range of 35-75, 150p is in a range of 15-35, 64m is in a range of 10-30 and Mq is in a range of 1-5. The modified fluorine-containing rheological agent, PE100 and tube resin are homogeneously mixed in a mixer and the mixture is melted and extruded through an extruder so that the extrusion torque is decreased, the extrusion efficiency is improved, and rheological behavior in the PE100 and tube resin processing is improved.

Description

technical field

[0001] The invention belongs to the field of processing aids for pipe materials, in particular to a modified fluorine-containing rheology agent for pipe materials and its application. Background technique

[0002] PE100+ pipe material is an improved third-generation polyethylene pipe material developed in the 1980s, and its 50-year minimum hydrostatic strength is not less than 10MPa. Compared with PE100, the pressure resistance, rigidity and strength of PE100+ pipe material have been greatly improved. However, the processing performance of this pipe material in the pipe extrusion process is not very ideal. Generally, polyethylene resins with more high molecular weight fractions often have some processing defects during the melt extrusion process, such as "water lines" and "shark spots", etc., and to a lesser degree, the surface of the extruded pipe loses luster , the more serious ones are surface wrinkling; under higher shear stress, periodic melt fracture w...

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