Fluorine-containing polymer auxiliary master batch with effect of eliminating melt fracture

Abstract

The invention discloses fluorine-containing polymer auxiliary master batch with an effect of eliminating melt fracture. By using the fluorine-containing polymer auxiliary master batch to improve the flowability of UHMWPE / PE alloy, the 'sharkskin' phenomenon in alloy extrusion is reduced. According to the technical scheme, the fluorine-containing polymer auxiliary master batch is prepared by usingfluorine-containing polymer auxiliaries as the additives and using different types of polyethylene materials as the matrix resin. The fluorine-containing polymer auxiliary master batch is prepared by,by mass percentage, 95-99% of polyethylene resin and 1-5% of fluorine-containing polymer auxiliaries. A preparation method of the fluorine-containing polymer auxiliary master batch includes the stepsof firstly, drying; secondly, weighing materials; thirdly, mixing; fourthly, performing extrusion granulation. The prepared fluorine-containing polymer auxiliary master batch is good in surface smoothness, capable of improving the 'sharkskin' phenomenon of the UHMWPE / PE alloy, capable of increasing productivity and lowering energy consumption and beneficial to the forming of UHMWPE / PE alloy pipes.

Description

technical field [0001] The invention relates to a processing aid, in particular to a fluorine-containing polymer processing aid masterbatch with the effect of eliminating melt fracture and a preparation method thereof. Background technique [0002] In recent years, phenomena such as "shark skin" melt flow instability and melt cyclic rupture have become one of the most important problems that have to be solved in thermoplastic polymer processing. Especially for UHMWPE / PE alloys, melt fracture not only limits the efficiency of extrusion processing, product dimensional stability and surface gloss, but also seriously restricts the development of processing economy. Therefore, efficient processing and molding of polymers depends on effectively solving melt fracture problems such as "shark skin". In order to solve this problem, many polymer additives came into being. Polymer Processing Additives (PPA) improved from fluoroelastomers and fluoroplastics is a new type of processing ...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102399407A discloses a preparation method of a modified fluorine-containing processing aid. A modified fluorine-containing processing aid is obtained by polymerizing a modified fluoroelastomer with a polymer; the modified fluorine-containing processing aid Effectively increase the bonding time between fluoroelastomers and metals, reduce the amount of fluoroelastomers used, increase the compatibility of fluoroelastomers and polymers, and improve the processing performance of resins, but there is no Mention that this modification aid improves surface defects during polymer extrusion processing

[0006] In view of the UHMWPE / PE alloy pipe extrusion process application of fluoropolymer additive masterbatch to eliminate surface defects, the present invention has developed a fluoropolymer additive masterbatch, and by adding the masterbatch to In UHMWPE / PE alloy, the extrusion process was initially explored

In addition, the form of fluorine-containing polymer additives is powder, and powder additives are directly added to granular polyethylene materials, which has problems such as difficulty in dispersion and dust pollution.