A kind of short process preparation method of thermotropic liquid crystal polyarylate nanofibrils
A polyarylate and thermotropic technology, which is applied in the field of preparation of thermotropic liquid crystal polyarylate nano-fibrils, can solve the problem of high molecular weight thermotropic liquid crystal polyarylate spinning forming process and fiber spinning processing equipment High precision requirements, narrow processing window temperature and other issues, to achieve the effect of easy substrate contact, environmental protection and continuous production, and conducive to mold filling
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[0032] ② Preparation of complex
[0033] The dried alkali-soluble polyester and thermotropic liquid crystal polyarylate are blended and extruded in a twin-screw extruder according to mass percentage respectively.
[0034] in,
[0035] 85-95 parts of alkali-soluble polyester
[0036] Thermotropic liquid crystal polyarylate 5-15 parts
[0037] The heating temperatures of the twin-screws are respectively: 220-250°C in the feed zone, 260-310°C in the melting zone, 250-300°C in the compression zone, and 260-310°C at the outlet.
[0038] Then, the compound prepared by the twin-screw extruder is vacuum-dried at 100-130° C. and kept at constant temperature for 24-48 hours.
[0039] ③ Melt spinning
[0040] The compound prepared by step ② is placed in a spinning machine for melt spinning to obtain alkali-soluble polyester fibers containing thermotropic liquid crystal polyarylate nanofibrils.
[0041]The screw heating temperatures for melt spinning are: feed zone 230-250°C, melting...
Embodiment 1
[0049] The fully aromatic random copolyester of p-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid with a melting point of 250°C and the alkali-soluble polyester with a melting point of 250°C are pre-crystallized and vacuum-dried, and the initial temperature of the vacuum drying temperature is 80°C , 1h to raise the temperature to 120°C, keep the temperature for 10h, then raise the temperature to 150°C, keep the temperature for 24h to make the water content reach 30ppm. The dried alkali-soluble polyester and the fully aromatic random copolyester of p-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid are mixed in a twin-screw extruder at a mass percentage of 85 / 15. The heating temperatures of the extruder are respectively: 220°C in the feed zone, 260°C in the melting zone, 250°C in the compression zone, and 260°C at the outlet. Then, the compound extruded by the twin-screw extruder was vacuum-dried, the vacuum drying temperature was 100° C., and the constant temperature time was 24 ...
Embodiment 2
[0051] The fully aromatic random copolyester of p-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid with a melting point of 280°C and the alkali-soluble polyester with a melting point of 280°C are pre-crystallized and vacuum-dried, and the initial temperature of the vacuum drying temperature is 90°C , 1h to raise the temperature to 130°C, keep the temperature for 11h, then raise the temperature to 160°C, keep the temperature for 32h to make the water content reach 20ppm. The dry alkali-soluble polyester and the fully aromatic random copolyester of p-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid are mixed in a twin-screw extruder at a mass percentage of 90 / 10. The heating temperatures of the extruder are respectively: 240°C in the feed zone, 285°C in the melting zone, 270°C in the compression zone, and 285°C at the outlet. Then, the compound extruded by the twin-screw extruder was vacuum-dried, the vacuum drying temperature was 120° C., and the constant temperature time was 32 ho...
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