A kind of liquid crystal polyester composition
A technology of liquid crystal polyester and composition, applied in liquid crystal materials, chemical instruments and methods, etc.
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Embodiment A1-A4
[0075] Embodiment A1-A4: the preparation of liquid crystal polyester
[0076] Add the repeating units derived from aromatic hydroxycarboxylic acid, the repeating units derived from aromatic diol and the repeating units derived from aromatic Repeating unit of carboxylic acid, and add a certain proportion of acetic anhydride as acylating agent; then pass nitrogen into the reaction kettle for replacement; start stirring, and heat the reaction mixture from room temperature to 140°C-160°C in nitrogen flow, Reflux at this temperature for 1 hour to 3 hours; then continue to heat up, and heat the mixture from 140°C to 160°C to 300°C to 350°C over 2 hours to 4 hours, during which unreacted acetic anhydride and side reactions are evaporated Product acetic acid; In the final polycondensation stage, the reaction system is decompressed, and judged by observing that the torque rises as the end point of the reaction; at this time, the prepolymer in the melt state is discharged through the di...
Embodiment 1-14 and comparative example 1-6
[0079] Examples 1-14 and Comparative Examples 1-6: Preparation of Liquid Crystal Polyester Composition
[0080] Mix the obtained liquid crystal polyester, filler, strontium-containing compound and / or antimony-containing compound, and / or various additives prepared by Examples A1-A4 according to the ratio in Table 2, and then add them to the twin-screw extruder machine, melt and mix at the screw speed of 280RPM-320RPM, the temperature of the screw barrel is 290°C-355°C, extrude, cool, and pelletize to obtain the liquid crystal polyester composition. The melting point, maximum bubble resistance temperature and HDT of gained liquid crystalline polyester composition are listed in table 2;
[0081] Wherein, the content of metal strontium element and metal antimony element in the liquid crystal polyester composition is adjusted and measured by the actual addition amount of the strontium-containing compound and the antimony-containing compound during the preparation process of the liq...
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Abstract
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