2,6-DIHALOBENZONITRILE-4,4'-DIHALOBENZOPHENONE-PHENOLPHTHALEIN TERPOLYMER, PREPARATION METHOD THEREOF AND INSULATING COATING COMPOSITION

摘要

2,6-dihalobenzonitrile-4,4'-dihalobenzophenone-phenolphthalein terpolymer comprises a first repeat unit shown in formula (I) and a second repeat unit shown in formula (II), the molar ratio of the first repeat unit to the second repeat unit being 0.1:9.9 to 9.9:0.1. A preparation method of the 2,6-dihalobenzonitrile-4,4'-dihalobenzophenone-phenolphthalein terpolymer comprises: reacting 2,6-dihalo benzonitrile and 4,4'-dihalobenzophenone with phenolphthalein in an organic solvent in the presence of an alkali compound and a water-carrying agent to obtain 2,6-dihalobenzonitrile-4,4'-dihalobenzophenone-phenolphthalein terpolymer. The terpolymer has good heat-resisting performance and can be used for preparing high-performance coatings and adhesives. An insulating coating composition comprises the above terpolymer, the intrinsic viscosity thereof being 0.2 dL/g to 1.4 dL/g; a solvent; a flatting agent, and so on.