Polyimide fiber spinning solution based on 2, 2-double [4-(2, 4-diaminophenoxy) phenyl group] hexafluoropropane and preparation method thereof
A technology of diaminophenoxy, polyimide fiber, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, textiles and papermaking, etc., to achieve the effects of being conducive to industrialization, convenient source and simple operation
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[0037] Add 54.8 grams (0.1 moles) of 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane and 400 milliliters of N-methyl-2-pyrrolidone into the reaction kettle, After stirring and dissolving, add 29.6 grams (0.2 moles) of phthalic anhydride powder, stir and react for 0.5 hours, cool in an ice-water bath to below 5°C, add 10.9 grams (0.05 moles) of pyromellitic dianhydride powder, and stir for 0.5 hour, then, add 16.1 grams (0.05 mole) 3,3 ', 4,4'-tetracarboxybenzophenone dianhydride powder, keep the reaction temperature below 5°C, stir and react for 2 hours to obtain a homogeneous transparent viscous Thick 2,2-bis[4-(2,4-diaminophenoxy)phenyl]hexafluoropropane based polyimide fiber spinning dope.
[0038] Using BROOKFIELD's CAP2000+ laminar viscometer to measure its viscosity at 80°C is 1549mPa.s.
[0039] Take an appropriate amount of the above-mentioned polyimide fiber spinning stock solution, apply it evenly on a clean flat glass sheet, put it into a blast high-temperat...
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