Method for the production of tubes in composite materials
Method of producing pipes and pipe auxiliary pieces for pipeline systems in composite material, especially for service water and drinking water, produced by the filament winding process with binders based on epoxy resins containing on average more than one epoxide group in the molecule and on curing agents for the epoxy resins, with the use of customary auxiliaries and additives, characterized in that as binder a curable composition comprising a) a liquid epoxy resin having epoxide values of from 0.40 to 0.65 and b) an adduct of a triethylenetetraminoimidazoline with a glycidyl ether having more than one epoxide group per molecule is used.
1 - 10 . (Canceled).
11 . Method of producing pipes and pipe auxiliary pieces for pipeline systems in composite material, especially for service water and drinking water, produced by the filament winding process with binders based on epoxy resins containing on average more than one epoxide group in the molecule and on curing agents for the epoxy resins, with the use of customary auxiliaries and additives, wherein as binder a curable composition comprising
a) a liquid epoxy resin having epoxide values of from 0.40 to 0.65 and
b) an adduct of a triethylenetetraminoimidazoline with a glycidyl ether having more than one epoxide group per molecule is used.
12 . Method according to claim 11 , wherein a liquid bisphenol A resin and/or bisphenol F resin is used as epoxy resin a).
13 . Method according to claim 11 , wherein the epoxy resin a) has an epoxide value of from 0.45 to 0.65.
14 . Method according to claim 11 , wherein the epoxy resin a) has an epoxide value of from 0.50 to 0.61.
15 . Method according to claim 11 , wherein a reactive diluent is also used.
16 . Method according to claim 11 , wherein a lower aliphatic carboxylic acid having 2 to 4 carbon atoms is used as carboxylic acid for preparing the triethylenetetraminoimidazoline.
17 . Method according to claim 16 , wherein acetic and/or propionic acid is used as carboxylic acid.
18 . Method according to claim 11 , wherein a diglycidyl ether of bisphenol A and/or bisphenol F is used for adducting the triethylenetetraminoimidazoline b).
19 . Method according to claim 11 , wherein from 0.05 to 0.5 epoxide equivalents of the epoxy resin are used for adduct formation per mole of the triethylenetetraminoimidazoline.
20 . Method according to claim 11 , wherein from 0.15 to 0.3 epoxide equivalents of the epoxy resin are used for adduct formation per mole of the triethylenetetraminoimidazoline.
21 . Method according to claim 11 , wherein the imidazoline content of the triethylenetetraminoimidazoline is at least 50 mol %.
22 . Method according to claim 11 , wherein the imidazoline content of the triethylenetetraminoimidazoline is at least 70 mol %.