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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  • Abstract
  • Description
  • Claims
  • Application Information

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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-polyethylen

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

Examples

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Example Embodiment

[0023] The preparation method of polylactic acid (PLA) - polybutylene glycol ester (PES) copolymer, polylactic acid-polybutadic acid ethylene glycol ester copolymer is L-lactide and poly The tertiaquate ethylene glycol ester prepolymer is synthesized under the action of catalyst, and the specific steps are as follows:

[0024] (1) Synthesis of prepolymer polybutadic acid ethylene glycol ester:

[0025] Ethylene glycol and butaric acid were added to the reactor, and the catalyst was added, and the content of butyric acid and the total amount of ethylene glycol were added to 0.8-2%, in an inert atmosphere, At 110-195 ° C, the constant pressure was maintained at 0.20-0.30 MPa, and the reaction was 4-8 hours until the small molecule fraction was evaporated, and the obtained esterified reaction product was evacuated, and the vacuum was controlled in 200 Pa. Within 2-8 hours, the vacuum conditions were reacted for 2-8 hours, and the polybutadic acid ethylene glycol ester prepolymer was ...

Example Embodiment

[0034] Example one

[0035] Add the ethylene glycol and butaric acid by a ratio of 1.45: 1 to the reaction kettle, titanate tetrabut catalyst (content of butyric acid and 0.82% of glycol mass), in an inert atmosphere Next, at 175 ° C, the constant pressure was maintained at 0.25 MPa, and the reaction was 6 hours until the small molecular fraction was evaporated, then the obtained esterified reaction product was evacuated, and the vacuum is controlled within 200 Pa. The polybutadic acid ethylene glycol ester prepolymer was obtained by reaction at 185 ° C for 7 hours. The L-lactide and polybutadic acid ethylene glycol ester prepolymer were added in the reaction vessel of 2: 1. ), Under an inert atmosphere, warmed to 175 ° C, and the reaction was 12 hours to obtain a polylactic acid-polybutadic acid ethylene glycol ester copolymer. The resulting polylactic acid-polybutadic acid ethylene glycol ester copolymer is dissolved with chloroform, water absolute ethanol precipitate, and dried...

Example Embodiment

[0036] Example 2

[0037] Add the ethylene glycol and butaric acid by a ratio of 1.45: 1 to the reaction kettle, titanate tetrabut catalyst (content of butyric acid and 0.82% of glycol mass), in an inert atmosphere Next, at 175 ° C, the constant pressure was maintained at 0.25 MPa, and the reaction was 6 hours until the small molecular fraction was evaporated, then the obtained esterified reaction product was evacuated, and the vacuum is controlled within 200 Pa. The polybutadic acid ethylene glycol ester prepolymer was obtained by reaction at 185 ° C for 7 hours. The L-lactide and polybutadic acid ethylene glycol ester prepolymer were added to the reaction vessel of 2.5: 1, and then a difty acid tin catalyst (1% molar l-lactide) was added. ), Under an inert atmosphere, warmed to 175 ° C, and the reaction was 12 hours to obtain a polylactic acid-polybutadic acid ethylene glycol ester copolymer. The resulting polylactic acid-polybutadic acid ethylene glycol ester copolymer is disso...

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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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