Method for prparing polyisocyanurate composite

Details Method for prparing polyisocyanurate composite Method for prparing polyisocyanurate composite

B - Operations, Transporting

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18/689

B29C 45/00 (2006.01) C08G 18/02 (2006.01) C08G 18/09 (2006.01) C08G 18/16 (2006.01) C08G 18/20 (2006.01) C08G 18/48 (2006.01) C08G 18/79 (2006.01) C08K 7/14 (2006.01)

Patent

CA 1284863

ABSTRACT OF THE DISCLOSURE A method for preparing a polyisocyanurate composite obtained by injecting a formulated liquid comprises an organic polyisocyanate, a polyol and a trimerization catalyst into a mold in which a fibrous reinforcing material is previously set by use of a reaction injection molding machine, wherein: (1) a single or mixed polyether polyol having a hydroxyl value of 40 to 400 is used as the polyol, and (2) the formulation ratio of the organic polyisocyanurate and the polyol in terms of the isocyanurated isocyanate concentration [NCO]T defined by the following formula (1) is in the range of 3.0 to 5.5 mmol/g: Image [NCO]T: theoretical concentration of isocyanate group consumed in isocyanuration; [NCO]O: isocyanate group concentration in organic polyisocyanate (mmol/g); OH-V: hydroxyl value of single or mixed polyol; WA: weight fraction of organic polyisocyanate.

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