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Melt fabrication of fiber-filled fluoropolymer

A melt processing, polymer technology, used in the field of fluoropolymers, which can solve the problems of slow extrusion rate, long cycle, incomplete filling of molds, etc.

Inactive Publication Date: 2009-06-10
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This difficulty carries over to the molding process, manifested by incomplete filling of the mold in the case of injection molding, longer cycles for compression molding to avoid voids in the molded part, and slow extrusion rates

Method used

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  • Melt fabrication of fiber-filled fluoropolymer
  • Melt fabrication of fiber-filled fluoropolymer
  • Melt fabrication of fiber-filled fluoropolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0035] The fluoropolymers used in these examples were as 200 ETFE Fluoropolymer available as ETFE from E.I. du Pont de Nemours and Company, said polymer having a melt flow rate of 7 g / 10 min measured at 297°C, and having a diameter of about 125 mils (3185 microns) and 175 mils An ear (4460 micron) length extruded melt-formed pellet form. The fibers used in the examples were glass fibres, but similar results could be obtained with any of the other fibers mentioned above. The glass fibers used were purchased from St. Gobain / Vetrotex as grade 910 chopped E-glass strands with a fiber length of approximately 188 mils (4.5 mm) and a fiber diameter of 10 microns. A dry blend composition was prepared containing 30% by weight glass fibers and 70% by weight ETFE pellets. This composition was added to a single screw operating at 10 rpm and heated to a melting temperature of 585°F (307°C). mixer, which passes the molten composition through Figure 4 The die extrusion shown has a 64...

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Abstract

A molding process is provided for a composition comprising fiber, such as glass, aramid, PTFE fiber, or carbon fiber, and melt-fabricable fluoropolymer, wherein the decrease in melt flowability of the composition as arises when the composition is provided to the process as conventional size melt-formed pellets is minimized by providing the composition to the process in the form melt-formed particles, at least 80 wt % of these particles having a width no greater than about 70 mils (1784 micrometers).

Description

field of invention [0001] The present invention relates to melt processing of melt processable fluoropolymers comprising a high proportion of fibers. Background of the invention [0002] The addition of glass fibers to the melt-fabricable fluoropolymer increases the stiffness (modulus) of articles molded from the resulting composition, typically by extrusion, injection molding, and compression molding. In molding, mechanical pressure is applied to cause the molten composition to flow sufficiently to form the desired shape of the article. The compositions are typically added to these processes as melt-formed pellets, which are typically melt-extruded from the composition into strands and chopped, wherein the resulting pellets are about 3000 to 4000 microns (118 to 157 mil) diameter, and about 2000 to 3500 microns (80 to 140 mil) in length. When the glass fiber content of the composition is increased to increase the rigidity and dimensional stability of the molded article, f...

Claims

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Application Information

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IPC IPC(8): C08K7/14C08K7/06C08L27/12
Inventor J·拉希贾尼
Owner EI DU PONT DE NEMOURS & CO
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