A method for the production of polyurethane precast concrete panels

(11) EP 3 587 059 A1

(22) 26.06.2018

(43) 01.01.2020

(57) The present invention relates to a method for the production of a polyurethane precast concrete panel and a polyurethane precast concrete panel produced by the method. The method comprises the steps of: adding a concrete slurry into a first mold cavity, placing a tem­plate in the first mold cavity along the inner periphery of its wall before the solidification of the concrete slurry, and then solidifying to obtain a first concrete panel; adding a concrete slurry into a second mold cavity, and placing the first concrete panel on the concrete in the second mold cavity before its solidification, with the side of the first concrete panel having the template facing the concrete in the second mold cavity; solidifying the concrete in the second mold cavity to form a second concrete pan­el, with a cavity formed between the first concrete panel and the second concrete panel, and then demoulding; and injecting a polyurethane reaction composition into the cavity and then curing to produce the precast con­crete panel. The method for the production of the poly­urethane precast concrete panel of the present invention is simple in process, and polyurethane precast concrete panels of various shapes and sizes can be produced with­out removing the polyurethane foaming mould or tem­plate.

(71) Covestro Deutschland AG 51373 Leverkusen (DE)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR, Designated Extension States: BA ME Designated Validation States: KH MA MD TN.