CL65 TOOK OFF WITH SEVERE ICE RPTED BY A LARGE ACR. THE TRAILING EDGE FLAPS FAILED BEFORE THE FLAPS WERE RETRACTED.

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I WAS ACTING AS THE FO ON FLT FROM ZZZ TO ZZZ2. WE LEFT THE GATE AND PROCEEDED OVER TO THE RAMP; WHERE WE WERE DEICED WITH TYPE I AND TYPE IV DEICING FLUID. I THEN CALLED FOR TAXI CLRNC. WE WERE INSTRUCTED TO TAXI TO RWY 36L. WHILE WAITING FOR OUR TKOF CLRNC; TWR RPTED THAT AN MD11 HAD RPTED MODERATE TO SEVERE ICING ON FINAL APCH. I LOOKED AT MY CAPT AND STATED SEVERE ICING. SHE SAID 'DISREGARD;' AND WE WERE CLRED ONTO THE RWY FOR TKOF. DURING OUR CLBOUT; WE ENCOUNTERED NO ICE; BUT MODERATE TURB. DURING OUR NORMAL CALLOUTS OF ACCELERATION ALT; AND V2 +12 KTS; THE CAPT ASKED FOR FLAPS 8 DEGS; WHICH I RESPONDED WITH FLAPS 8 DEGS. I THEN CALLED OUT V2 +20 KTS. SHE THEN ASKED FOR 'FLAPS UP; SET CLB THRUST.' I RESPONDED BY SELECTING THE FLAPS TO ZERO AND SETTING CLB THRUST. WHEN WE RECEIVED A MASTER CAUTION; I CANCELLED AND IDENTED THAT THE FLAPS HAD FAILED. WE NOTIFIED ATC AND REQUESTED TO LEVEL OFF AT 16000 FT; WHERE WE RAN CHKLISTS AND NOTIFIED COMPANY OF THE SIT. WE WERE INSTRUCTED TO DIVERT TO ZZZ3; WHERE WE DECLARED AN EMER AND EXECUTED A NO-FLAP LNDG; WHERE WE LANDED WITHOUT INCIDENT AND DEPLANED THE PAX. I BELIEVE THE SIT WAS DUE TO THE WX CONDITIONS AT THE ARPT AT THE TIME OF DEP.