Synthesis method for phosphorus copolymerization flame retardant polyester

Abstract

The invention discloses a synthesis method for phosphorus copolymerization flame retardant polyester. The method comprises the steps of: firstly subjecting dimethyl terephthalate, ethylene glycol, 9, 10-dihydro-9-oxo-10-phosphaphenanthrene, catalyst zinc acetate and antimony trioxide to ester exchange reaction at 150DEG C-230DEG C; and then raising the temperature to 275DEG C, reducing the pressure to 0.26kPa, and further carrying out reaction for 80min, thus obtaining the flame retardant polyester. The synthesis method for phosphorus copolymerization flame retardant polyester provided by the invention does not influence the catalyst effect during copolymerization, does not generate ether bond, and does not cause bridge stand effect, thus having no damage to the physical properties of original polyester. The obtained flame retardant polyester has good flame retardant performance and good water resistance.

Description

[0001] technical field [0002] The invention relates to a synthetic method of polyester, in particular to a synthetic method of phosphorus-containing flame-retardant polyester. [0003] Background technique [0004] Unsaturated polyester is a kind of thermosetting plastic with the largest output, but general-purpose unsaturated polyester is easy to burn, and the limiting oxygen index is only 19. When burning, it produces a lot of harmful smoke. In many cases, flame-retardant unsaturated polyester is required Saturated polyester resins, such as melamine, red phosphorus, ammonium polyphosphate, expanded graphite, and layered silicate nanoclay, have been reported as flame-retardant or composite flame-retardant unsaturated polyesters, but there are large amounts of introduction and influence on unsaturated polyester resins. The transparency, mechanical properties, electrical properties and other defects of polyester. [0005] Contents of the invention [0006] The object o...

AI Technical Summary

Problems solved by technology

[0004] Unsaturated polyester is a kind of thermosetting plastic with the largest output, but general-purpose unsaturated polyester is easy to burn, and the limiting oxygen index is only 19. When burning, it produces a lot of harmful smoke. In many cases, flame-retardant unsaturated polyester is required. Saturated polyester resins, such as melamine, red phosphorus, ammonium polyphosphate, expanded graphite, and layered silicate nanoclay, have been reported as flame-retardant or composite flame-retardant unsaturated polyesters, but there are large amounts of introduction and influence on unsaturated polyester resins. The transparency, mechanical properties, electrical properties and other defects of polyester