Liquid crystal polyarylester with low dielectric constant and low dielectric loss as well as composition and film of liquid crystal polyarylester
A low dielectric constant, polyarylate technology, applied in the field of polymer engineering plastics, can solve the problems of high cost, poor interlayer adhesion, easy foaming, etc. Effect
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Embodiment 1
[0026] According to monomer formula 1, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, hydroquinone, 2,3,5,6-tetrafluorohydroquinone, and hydroxyl-containing monomers Acetic anhydride with 1.3 times the total molar number of hydroxyl groups, 3-(dimethylamino)pyridine accounting for 30ppm of the total weight of five monomers, and tin powder accounting for 0.2% of the total weight of five monomers were dropped into the Hastelloy polymerization kettle Keep at 140°C for 2h; raise the temperature to 300°C at a rate of 0.4°C / min, and keep it warm for 2h; pour 0.1MPa nitrogen into the polymerization kettle, release the reaction material through an 8-hole discharge valve with a diameter of 2mm, crush it, and pass through 20 meshes Sieve and dry at 140°C for 1 hour to obtain a prepolymer; solid-state polycondensate the prepared prepolymer in a rotary kiln at 195°C for 12 hours under a nitrogen atmosphere to obtain a liquid crystal polyarylate;
[0027] Dry the liq...
Embodiment 2
[0030] According to monomer formula 2, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, hydroquinone, 2,3,5,6-tetrafluorohydroquinone, and hydroxyl-containing monomers Acetic anhydride with 1.6 times of the total molar number of hydroxyl groups, 3-(dimethylamino)pyridine accounting for 160 ppm of the total weight of five monomers, and tin powder accounting for 0.3% of the total weight of five monomers were dropped into the Hastelloy polymerization kettle Keep at 143°C for 3h; raise the temperature to 305°C at a rate of 0.5°C / min, and keep it warm for 2h; pour 0.5MPa nitrogen into the polymerization kettle, discharge the reaction material through a 9-hole discharge valve with a diameter of 3mm, crush it, and pass through 25 mesh Sieve and dry at 145°C for 1 hour to obtain a prepolymer; conduct solid-phase polycondensation of the prepared prepolymer in a rotary kiln at 305°C for 18 hours under a nitrogen atmosphere to obtain a liquid crystal polyarylate;
[...
Embodiment 3
[0034]According to monomer formula 3, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, terephthalic acid, hydroquinone, 2,3,5,6-tetrafluorohydroquinone, and hydroxyl-containing monomers Acetic anhydride with 2.1 times of the total molar number of hydroxyl groups, 3-(dimethylamino)pyridine accounting for 280ppm of the total weight of five monomers, and tin powder accounting for 0.4% of the total weight of five monomers were dropped into the Hastelloy polymerizer Keep at 148°C for 4 hours; raise the temperature to 312°C at a rate of 0.6°C / min, and keep it warm for 2 hours; pour 0.8MPa nitrogen into the polymerization kettle, release the reaction material through an 8-hole discharge valve with a diameter of 4mm, crush it, and pass through 30 meshes Sieve and dry at 150°C for 2 hours to obtain a prepolymer; solid-phase polycondensate the prepared prepolymer in a rotary kiln at 310°C for 24 hours under a nitrogen atmosphere to obtain a liquid crystal polyarylate;
[0035] Dry the...
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