Multi-layer nuclear shell structural fluorin-containing polymer particle and thermoplastic polyolefin product having the same

Abstract

The present invention relates to a fluorin-containing polymer granule with multilayer core shell structure and thermoplastic polyolefin products. The gross weight of the fluorin-containing polymer granule include: a) 20 to 80 percent by weight of fluorin-carbon polymer core materials; b) 5-30 percent by weight of intermediate-layer of acrylate copolymer, methacrylate copolymer, or their compounds; c) 15-50 percent by weight of polymer outer layer with melting point at 50-100 DEG C; The average granular diameter of fluorin-containing polymer granules is 0.1-10 mm. Fluorin-contain polymer granules of the present invention, being added with thermoplastic polyolefin melt, can be not only dispersed evenly but significantly improve critical shear rate and obviously speed up the time for the removal of melt rupture; thereby reducing surface defects of extruded products and improving transparency of thin film.

Description

technical field [0001] The present invention relates to fluoropolymer particles of multilayer core-shell structure and thermoplastic polyolefin articles containing the same. Background technique [0002] It is well known that the propulsion of the rotating screw can make the viscous polymer melt pass through the extruder barrel and enter the die, so that the polymer can be formed into the desired shape, and then cooled and solidified into a product with the general shape of the die. High molecular weight polymers such as polyolefins are extruded into shaped structures such as pipes, conduits, cable sheaths or films. [0003] In order to reduce production costs, it is desirable to extrude polymers at high rates. Higher extrusion rates can be easily obtained by increasing the extruder screw speed. However, at very high extrusion rates, the surface of the extrudate is rough, forming an undesired pattern. These surface defects are also known as melt fractures. [0004] There...

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Problems solved by technology

However, this fluorocarbon polymer also suffers from insufficient critical shear rate and slow onset time to eliminate melt fracture

[0006] U.S. Patent No. 6,642,310 found that the introduction of polyester into fluorocarbon polymers can significantly increase the critical shear rate, and at the same time significantly accelerate the onset time of eliminating melt fracture, but the addition of polyester will lead to the problem of difficult dispersion, resulting in crystallization on the surface of film products. point of defect

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