Polyols for Polyurethane Fibre-Reinforced Composite


Number/Link: WO2018/224592 (German)

Applicant/Assignee: BASF

Publication Date: 13 December 2018

“Gist”: Composite composition based on polyol prepared from initiator mixture comprising castor oil

Why it is interesting: Polyurethane composite production by filament winding, pultrusion and similar processes are known.  These PU systems need a low viscosity, good fibre-wetting properties, long open time and preferably a “snap cure” when activated.  According to this invention, such systems can be prepared from polyols which are made by alkoxylating an initiator mixture consisting of a (pref) 50/50 (w/w) mixture of a fat-based alcohol and an aliphatic trifunctional alcohol, using imidazole catalysis. In an example a castor oil/glycerol mixture is propoxylated to an OH value of  480 mg KOH/g.  Surprisingly this polyol shows a longer open time compared to the corresponding mixture of seperately initiated polyols.

castor oil

Main component of castor oil

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