| 摘要 |
Provided is a preparation method for polyamide-imide fibrid, characterized by specifically comprising: Step 1: treating a diamine monomer and trimellitic anhydride chloride in an aprotic polar solvent through a catalyst to obtain a polyamic acid polymer, and then performing chemical cyclodehydration to obtain a polyamide-imide polymer solution; Step 2: diluting the polyamide-imide polymer solution, adding the diluted polyamide-imide polymer solution and the precipitation liquid to a precipitation unit, and stirring to obtain a polyamide-imide fibrid suspension; and Step 3: washing, filtering and drying the polyamide-imide fibrid suspension to obtain the polyamide-imide fibrid. The method is simple in process, the size and form of the fibrid are easy to control, and the polyamide-imide fibrid can be directly applied to preparing high-performance paper. |
