Azobenzene structure based high-temperature self-cross-linked expanded flame-retardant anti-dripping copolyester and preparation method thereof
A technology of intumescent flame retardant and copolyester, which is applied in the field of flame retardant and anti-droplet copolyester and its preparation, can solve the problems of high raw material cost, limited application range of copolyester, clogging of spinneret, etc., and achieve good mechanical properties Performance, good heat insulation and oxygen insulation, good flame retardant and droplet resistance
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Embodiment 1
[0056] Add 332g of terephthalic acid, 195g of ethylene glycol, 27g of 3,5-azophthalic acid and 0.144g of antimony trioxide into the reactor, fill with nitrogen to remove the air in the reactor, and then pressurize to 0.1MPa; Raise the temperature to 240°C within 2 hours to carry out the esterification reaction. Control the pressure in the kettle to 0.3-0.4 Mpa. After maintaining for 2 hours, the pressure begins to drop. Within 1.5 hours, the temperature gradually rises to 260°C, the pressure drops to normal pressure, and the esterification reaction ends. ;Condensation in low vacuum at 260°C for 1 hour, then heat up to 275°C in vacuum (pressure 2 .
Embodiment 2
[0058] 332g terephthalic acid, 205g ethylene glycol, 54g 3,5-azophthalic acid and 0.146g antimony trioxide were added to the reactor, and the esterification reaction was carried out according to the steps and conditions given in Example 1 and After polycondensation, discharge. The intrinsic viscosity of the copolyester is 0.78dL / g; the oxygen index is 27.0%, the vertical combustion level is V-2, and the number of drips from two ignition to extinguishment in vertical combustion is 2 times (the drips are not formed by the melt Droplets, which are solid carbon residues), the peak heat release rate pHRR in the cone calorimetry test is 500kW / m 2 .
Embodiment 3
[0060] 332g terephthalic acid, 223g ethylene glycol, 108g 3,5-azophthalic acid and 0.156g antimony trioxide were added to the reactor, and the esterification reaction was carried out according to the steps and conditions given in Example 1 and After polycondensation, discharge. The intrinsic viscosity of the copolyester is 0.86dL / g; the oxygen index is 30.0%, the vertical combustion level is V-0, there is no droplet from two ignition to extinguishment in the vertical combustion, and the peak heat release rate pHRR in the cone calorimetry test 400kW / m 2 .
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