ZHANG Jian-li;SHANG Hong-yong;LIANG Xiao;LIU Xin-qin. Preparation of Key Intermediate 4-BDAF Used for PI Alignment Agent of TFT-LCD[J]. 液晶与显示, 2009,24(3): 345-349
ZHANG Jian-li;SHANG Hong-yong;LIANG Xiao;LIU Xin-qin. Preparation of Key Intermediate 4-BDAF Used for PI Alignment Agent of TFT-LCD[J]. 液晶与显示, 2009,24(3): 345-349DOI:
Polyimide (PI) was widely used as alignment agent of TET-LCD because of its excellent advantages
while 4-BDAF was a key intermediate of alignment layer used for PI preparation. A new synthesis method of 4-BDAF was studied and the reaction conditions were optimized in this research. The results showed that optimal reaction conditions were: the molar ratio of hexafluroacetone
phenol and catalyst was controlled to be 1 ∶ 2 ∶ 2; methanesulfonic acid was chosen as the catalytic dehydrant; the reaction temperature was 155 ℃; and the reaction time was 11 h
respectively. The yield of 4-BDAF was 57%. The quality of the purified products could be equal to that from companies overseas. However
the price was competitive. And the technology could be industrialized easily.
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references
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