Novel phosphorus and nitrogen containing flame-retardant thermotropic liquid crystal copolyester with low melting point and synthesis method thereof
A technology of thermotropic liquid crystal and low melting point, which is applied in the field of chemical synthesis, can solve problems such as the complex structure and reduction of the flexible unit imide diacid that are not conducive to the melting point of TLCP, and achieve high yield, good reproducibility, and synthetic The effect of simple method
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[0032] Example 1,
[0033] Weigh 0.013mol p-acetoxybenzoic acid (p-AHB) and 0.004mol 10-(2,5-dihydroxyphenyl)-10-hydro-9-oxa10-phosphaphenanthrene-10-oxide respectively Diacetate (ODOPB), 0.003mol terephthalic acid (TPA) and the condensation product of 0.002mol terephthalic acid and 1,6-hexanediamine. The reaction raw materials were put into a three-necked flask, and a nitrogen flow device was installed. Repeatedly pass nitrogen and vacuum to exhaust the oxygen in the three-neck bottle. The oil bath was heated to 170°C, the reaction was carried out under strong stirring and nitrogen protection, and the temperature was raised at a heating rate of 1°C / 2min. When the temperature rises to 250°C, the reaction system has obvious stirring opalescence, the viscosity is high, and the small molecule by-product acetic acid is not easy to escape. At this time, the nitrogen flow is stopped and the oil pump is used to vacuum. Continue to heat up to 270°C, and the pressure in the reaction fl...
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[0034] Example 2,
[0035] Weigh p-AHB 0.015mol, ODOPB 0.005mol, TPA 0.002mol and the condensation product of terephthalic acid and 1,6-hexanediamine 0.002mol. The reaction raw materials were put into a three-necked flask, and a nitrogen flow device was installed. Repeatedly pass nitrogen and vacuum to exhaust the oxygen in the three-neck bottle. The oil bath was heated to 165°C, the reaction was carried out under strong stirring and nitrogen protection, and the temperature was raised at a heating rate of 1°C / 2min. When the temperature rises to 243°C, the reaction system has obvious stirring opalescence, the viscosity is high, and the small molecule by-product acetic acid is not easy to escape. At this time, the nitrogen flow is stopped and the oil pump is used to vacuum. Continue to heat up to 268°C, and the pressure in the reaction flask remains basically unchanged, indicating that small acetic acid molecules are no longer generated. When the reaction is over, the heating is...
Example Embodiment
[0036] Example 3.
[0037] Weigh p-AHB 0.013mol, ODOPB 0.004mol, TPA 0.003mol, and the condensation product of terephthalic acid and 1,7-heptanediamine 0.002mol. The reaction raw materials were put into a three-necked flask, and a nitrogen flow device was installed. Repeatedly pass nitrogen and vacuum to exhaust the oxygen in the three-neck bottle. The oil bath was heated to 172°C, the reaction was carried out under strong stirring and nitrogen protection, and the temperature was raised at a heating rate of 1°C / 2min. When the temperature rises to 248°C, the reaction system appears obvious agitated opalescence, the viscosity is high, and the small molecule by-product acetic acid is not easy to escape. At this time, the nitrogen flow is stopped and the oil pump is used to vacuum. Continue to heat up to 275°C, and the pressure in the reaction flask remains basically unchanged, indicating that small acetic acid molecules are no longer generated. When the reaction is over, the heat...
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