| abstract |
The invention discloses a preparation method of flame-retardant linear copolyester resin, which is characterized in that: in reactor A, terephthalic acid or dimethyl terephthalate, ethylene glycol, catalyst antimony acetate or antimony trioxide, stirred and reacted at a temperature of 160-240°C for 3-4 hours to prepare a low-molecular-weight polyester resin and keep it warm for later use; mix DOPOMA or DOPOITA, dihydroxyfluorosiloxane, ethylene glycol, and an esterification catalyst Put it into reactor B, heat up to react under stirring, then add polycondensation catalyst and stabilizer, then raise the temperature to 220°C and keep it warm; add the materials in reactor B into reactor A under stirring conditions, and heat up to react, that is, A flame retardant linear copolyester was obtained. By adopting the present invention, the flame retardant performance of the copolyester resin is long-acting and stable, and the heat resistance and thermal stability can be improved; the prepared flame retardant linear copolyester can be used to produce flame retardant polyester fiber, film and flame retardant Combustible polyester plastic products, etc. |