Use of a shaped part made of a polyamide shaped component as an inliner for a counduit

Abstract

A pipe or hose composed of a polyamide moulding composition whose molecular weight has been increased by condensation, via addition of a compound having at least two carbonate units in a quantitative proportion of from 0.005 to 10% by weight, based on polyamide, where a) a starting polyamide moulding composition was provided, b) a mixture of the starting polyamide moulding composition and of the compound having at least two carbonate units was produced, c) the premix was, if desired, stored and/or transported, and d) the premix was then processed to give the moulding, this step being the first in which the increase of molecular weight by condensation occurred, the moulding being a pipe or hose whose external diameter is at least 25 mm is used as inliner for a pipeline.

1 . A moulding as an inliner for a pipeline, said moulding comprising a polyamide moulding composition whose molecular weight has been increased by condensation, via the addition of a compound having at least two carbonate units in a quantitative proportion of from 0.005 to 10% by weight, based on polyamide, where
 a) a starting polyamide moulding composition is provided,   b) a mixture of the starting polyamide moulding composition and of the compound having at least two carbonate units is produced,   c) the premix is, optionally stored and/or transported, and   d) the premix is then processed to give the moulding, this step being the first in which the increase of molecular weight by condensation occurs,
 said moulding being a pipe or hose whose external diameter is at least 25 mm. 
   
   
   
       2 . The molding according to  claim 1 ,
 characterized in that   the external diameter of the moulding is at least 60 mm.   
   
   
       3 . The molding according to  claim 1 ,
 characterized in that   the external diameter of the moulding is at least 110 mm.   
   
   
       4 . The molding according to  claim 1 ,
 characterized in that   the polyamide is prepared using a diamine or polyamine as a regulator.   
   
   
       5 . The molding according to  claim 1 ,
 characterized in that   the compound having at least two carbonate units is used in the form of a masterbatch.   
   
   
       6 . A pipeline, which contains the moulding according to  claim 1 . 
   
   
       7 . The pipeline according to  claim 6 ,
 characterized in that   it serves for the transport of district heating, fresh water, waste water, gas, oils, fuels, petrochemicals, brine, lyes, or abrasive fluids or dusts.