Belt for papermaking and process for producing papermaking belt

Details Belt for papermaking and process for producing papermaking belt Belt for papermaking and process for producing papermaking belt

D - Textiles, Paper

21

F

D21F 3/02 (2006.01) B32B 27/40 (2006.01) C08G 18/10 (2006.01) C08J 5/24 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2643178

A papermaking belt comprising a reinforcing substrate embedded in a thermosetting polyurethane layer, said thermosetting polyurethane layer including an inner polyurethane layer and an outer polyurethane layer adhering to the outer peripheral surface of said inner polyurethane layer, and each of said inner polyurethane layer and said outer polyurethane layer is made of a composition comprising a urethane prepolymer having isocyanate end groups and a hardener having active hydrogen end groups. The composition forming said inner polyurethane layer is prepared by mixing the urethane prepolymer and the hardener with each other in a ratio setting the equivalent ratio (H/NCO) between the active hydrogen groups (H) of the hardener and the isocyanate groups (NCO) of the urethane prepolymer to 0.85~ H/NCO < 1; and the composition forming said outer polyurethane layer is prepared by mixing the urethane prepolymer and the hardener with each other in a ratio setting the value of said equivalent ratio (H/NCO) to 1 < H/NCO < 1.15.

Courroie de fabrication de papier, comprenant un substrat de renfort encastré dans un film de polyuréthane thermodurcissable, ledit film comprenant une couche intérieure de polyuréthane et une couche extérieure du même matériau, adhérant à la surface périphérique extérieure de ladite couche intérieure de polyuréthane, les deux couches de polyuréthane en question étant fabriquées d'une composition consistant en un prépolymère d'uréthane comportant des groupes terminaux isocyanate et d'un agent de durcissement comportant des groupes terminaux actifs d'hydrogène. La composition qui forme ladite couche intérieure de polyuréthane est préparée en mélangeant le prépolymère d'uréthane et l'agent de durcissement entre eux, dans un rapport équivalent (H/NCO) de prépolymère d'uréthane de 0,85 =< H/NCO <1; la composition formant la couche extérieure de polyuréthane susmentionné est préparée en mélangeant prépolymère d'uréthane et l'agent de durcissement entre eux, dans un rapport où la valeur du rapport est : (H/NCO) à 1 < H/NCO < 1,15.

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