Flame-retardant aliphatic-aromatic copolyester and preparation method thereof

Abstract

The invention discloses flame-retardant aliphatic-aromatic copolyester, which is prepared with aromatic dibasic acid, aliphatic dibasic acid, aliphatic dihydric alcohol and phosphorus-based flame retardant. The amount of the phosphorus-based flame retardant is 0.05-1.00 percent of the flame-retardant aliphatic-aromatic copolyester by weight. A preparation method comprises the steps of: a) preparing butanediol solution of phosphate; b) performing esterification to obtain a corresponding esterified compound; c) performing prepolymerization to obtain a corresponding prepolymer; and d) performing polycondensation reaction. The flame-retardant aliphatic-aromatic copolyester has the beneficial effects that a titanium chelate compound with hydrolysis resistance is adopted as a catalyst, the amount of the added catalyst is reduced, the titanium dioxide precipitate cannot be produced during production, and the maintenance / replacement cycle of production equipment can be extended; and the material has degrading properties and flame retardant properties, the scope of application of the biodegradable material can be broadened further, the effect of stabilizing the color of the copolyester can be achieved while the flame retardant properties of the material is realized, the structure of the copolyester can be controlled easily, no gel can be produced easily during reaction, and the produced membrane is free from crystallization points formed by gel.

Description

technical field [0001] The invention relates to an aliphatic-aromatic copolyester and a preparation method thereof, in particular to a flame-retardant aliphatic-aromatic copolyester and a preparation method thereof. Background technique [0002] The application of synthetic polymers has been very extensive. Because the traditional general-purpose polymer materials are not degradable, they bring great convenience to people's lives, but also bring great pressure to the environment. Even with degradable natural materials such as starch Doping and degradation are only the filling part, and the non-degradable polymer part is difficult to recycle, causing inevitable environmental pollution, especially in agriculture, packaging and medical industries with short product life cycles. Finding new biodegradable alternative materials is one of the most interesting subjects at present. Aliphatic polyesters have good biodegradability, and can be converted into carbon dioxide and water in...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the storage and hydrolysis resistance of the material are not good, and it uses tetrabutyl titanate as a catalyst, which is easy to block or even damage the equipment.

[0007] So far, aliphatic-aromatic copolyesters are the copolymerization of three monomers, and there is no document disclosing the introduction of phosphorus-containing repeating units in the molecular chain. This type of material cannot fully meet the preparation requirements, especially for flame-retardant requirements. application requirements

[0008] In addition, in the production process of aliphatic-aromatic copolyesters, the catalysts used are titanium-containing organic compounds such as n-butyl titanate and tetraisopropyl titanate. Such catalysts have high activity, but are very easy to hydrolyze , the titanium dioxide formed by hydrolysis in the production process is very easy to block or even damage the equipment, which will adversely affect the production process

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