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Polylactic acid-polyethylene succinate copolymer and preparation method thereof

A technology of polyethylene succinate and copolymer, applied in the field of polylactic acid-polyethylene succinate copolymer and its preparation, can solve problems such as unsatisfactory synergistic effect, and achieve good physical The effect of mechanical properties, improving brittleness, and broad development prospects

Pending Publication Date: 2022-02-01
YINGKOU XIAOJIAZU IND
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of polylactic acid-polyethylene succinate copolymer and preparation method thereof, this invention adopts polylactic acid and polyethylene succinate to carry out polycondensation, provides a kind of polylactic acid-polyethylene succinate A polyethylene succinate copolymer, and a preparation method of the polymer, the copolymer has good mechanical properties and biodegradability, and solves the problem of synergistic growth between polylactic acid and polyethylene succinate The problem of unsatisfactory effect

Method used

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  • Polylactic acid-polyethylene succinate copolymer and preparation method thereof
  • Polylactic acid-polyethylene succinate copolymer and preparation method thereof
  • Polylactic acid-polyethylene succinate copolymer and preparation method thereof

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preparation example Construction

[0023] The preparation method of a polylactic acid (PLA)-polyethylene succinate (PES) copolymer, the polylactic acid-polyethylene succinate copolymer is composed of L-lactide and poly The ethylene glycol succinate prepolymer is synthesized and prepared under the action of a catalyst, and the specific steps are as follows:

[0024] (1) Synthesis of prepolymer polyethylene succinate:

[0025] Add ethylene glycol and succinic acid into the reaction kettle at a molar ratio of 1.08-1.55:1, add a catalyst, the content is 0.8-2% of the total mass of succinic acid and ethylene glycol, under an inert atmosphere, At 110-195°C, keep the system pressure at 0.20-0.30MPa, and react for 4-8 hours until no small molecular fractions are evaporated. Then, vacuum the obtained esterification reaction product to control the vacuum degree at 200Pa Within 170-200°C under vacuum conditions for 2-8 hours, vacuum extrusion to obtain polyethylene succinate prepolymer;

[0026] (2) Synthesis of polylac...

Embodiment 1

[0035] Add ethylene glycol and succinic acid into the reactor at a molar ratio of 1.45:1, add tetrabutyl titanate catalyst (the content is 0.82% of the total mass of succinic acid and ethylene glycol), and in an inert atmosphere At 175°C, keep the system pressure at 0.25MPa, and react for 6 hours until no small molecular fractions are evaporated, and then vacuumize the obtained esterification reaction product to control the vacuum degree within 200Pa. React at 185°C for 7 hours, and vacuum extrude to obtain a polyethylene succinate prepolymer. Add L-lactide and polyethylene succinate prepolymer in the mass ratio of 2:1 in the reactor, and then add tin dioctoate catalyst (with a content of 1% mole of L-lactide ), under an inert atmosphere, the temperature was raised to 175°C, and the reaction was carried out for 12 hours to obtain a polylactic acid-polyethylene succinate copolymer. The obtained polylactic acid-polyethylene succinate copolymer was dissolved in chloroform, preci...

Embodiment 2

[0037] Add ethylene glycol and succinic acid into the reactor at a molar ratio of 1.45:1, add tetrabutyl titanate catalyst (the content is 0.82% of the total mass of succinic acid and ethylene glycol), and in an inert atmosphere At 175°C, keep the system pressure at 0.25MPa, and react for 6 hours until no small molecular fractions are evaporated, and then vacuumize the obtained esterification reaction product to control the vacuum degree within 200Pa. React at 185°C for 7 hours, and vacuum extrude to obtain a polyethylene succinate prepolymer. Add L-lactide and polyethylene succinate prepolymer in the mass ratio of 2.5:1 in the reactor, and then add tin dioctoate catalyst (with a content of 1% mole of L-lactide ), under an inert atmosphere, the temperature was raised to 175°C, and the reaction was carried out for 12 hours to obtain a polylactic acid-polyethylene succinate copolymer. The obtained polylactic acid-polyethylene succinate copolymer was dissolved in chloroform, pre...

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Abstract

The invention relates to a polylactic acid-polyethylene succinate copolymer and a preparation method thereof. According to the preparation method of the polylactic acid-polyethylene succinate copolymer, the polylactic acid-polyethylene succinate copolymer is prepared by synthesizing L-lactide and a polyethylene succinate prepolymer under the action of a catalyst. The preparation method comprises the following specific steps: synthesizing a polyethylene succinate prepolymer; synthesizing the polylactic acid-polyethylene succinate copolymer; and post-processing the copolymer. The copolymer is prepared by ring-opening polymerization of the polyethylene succinate prepolymer and L-lactide, and a polyethylene succinate chain segment and a polylactic acid chain segment are combined by the copolymer, so the brittleness of polylactic acid can be effectively improved, and the mechanical properties of polyethylene succinate are retained; and the polylactic acid-polyethylene succinate copolymer has better physical and mechanical properties, can be completely biodegraded, and can be applied to the technical field of biodegradable copolymers.

Description

technical field [0001] The invention relates to a polylactic acid-polyethylene succinate copolymer in the technical field of biodegradable copolymers and a preparation method thereof. Background technique [0002] Polybutylene succinate (PBS) has good biodegradability, and at the same time, a large number of methylene structures on the main chain make it have mechanical and physical properties similar to general-purpose plastics, and can be used to prepare a variety of completely biodegradable High polymer products, such as garbage bags, food bags, various bottles, disposable catering utensils, etc. Polyethylene succinate (PES) is a homologue of polybutylene succinate, which has good processing performance, good mechanical properties and heat resistance, and the mechanical strength of polyethylene succinate is the same as that of polybutylene succinate. Polyethylene (LDPE) and polypropylene (PP) are similar. Like polybutylene succinate, it is a biodegradable aliphatic polye...

Claims

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Application Information

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IPC IPC(8): C08G63/02C08G63/08C08G63/16
CPCC08G63/02C08G63/08C08G63/16
Inventor 文博苏丹葛铁军唐恺鸿刘沛含李承玲刘宁于居盟张毅
Owner YINGKOU XIAOJIAZU IND
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