A process for preparing ultra high molecular weight polyethylene fibres

摘要

A process for preparing ultra high molecular weight polyethylene (UHMWPE) fibres comprising the following steps: i) preparing a mixture (A) of ultra high molecular weight polyethylene in a solvent having a concentration on in said polymer ranging from 0.3 to 2% by weight on the total mixture weight, ii) adding to a part of the mixture (A) polyethylene powder until obtaining a mixture (B) having a final concentration in said polyethylene of from 25 to 60% by weight, iii) mixing mixture (A) with (B), iv) extruding the mixture coming from step (iii), thereby obtaining UHMWPE fibres, v) extracting the paraffin oil from said fibres, vi) stretching the fibres coming from step (v), characterised in that the solvent consists of a mixture of saturated cycloparaffins and saturated aliphatic paraffins both type of paraffins having from 25 to 50 carbon atoms.