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A kind of biodegradable multi-block copolymer and preparation method thereof

A multi-block copolymer and biodegradable technology, applied in the field of copolymers, can solve the problems of limitations, high hydrophobicity of PBS, high brittleness of PLA, etc., and achieve the effects of convenient operation, easy control of reaction conditions, and broad application prospects

Active Publication Date: 2019-04-02
HANGZHOU XINFU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, PLA, PBS and PBAT are biodegradable materials with the most research at home and abroad, relatively mature technology and large scale of industrialization. However, these materials have some shortcomings that limit their application. For example, PLA is brittle at room temperature; PBS Highly hydrophobic, high crystallinity, etc.

Method used

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  • A kind of biodegradable multi-block copolymer and preparation method thereof
  • A kind of biodegradable multi-block copolymer and preparation method thereof
  • A kind of biodegradable multi-block copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of 1,2-propylene glycol succinate-polylactic acid multi-block copolymer comprises the following steps:

[0026] Step 1: Weigh 3.5 kg (29.7 mol) of succinic acid and 5.66 kg (74.5 mol) of 1,2-propanediol into the esterification reactor, raise the temperature to 230°C in a programmed manner, and stir for 5 hours until the water output reaches The theoretical water yield is 95%, and the esterification product of hydroxy-terminated succinic acid and 1,2-propanediol is obtained, and the acid value of the esterified product of hydroxy-terminated succinic acid and 1,2-propylene glycol is within 100mol / t.

[0027] Step 2: Transfer the above-mentioned esterification product to the polycondensation reactor, add the catalyst n-butyl titanate 9.38 g (accounting for 0.2% of the total mass of segment I), stir at 230 °C for 10 min, and then control the vacuum degree to 2.2 kPa, React for 1.5 h; then control the vacuum within 30 Pa, and react for 1.5 h to obtain hydroxyl-te...

Embodiment 2

[0036] Preparation of poly(1,2-propylene glycol succinate)-polylactic acid multi-block copolymer.

[0037] The steps of this example are the same as those of Example 1, except that in Step 4, the tri-block copolymer is added to the twin-screw extruder, the twin-screw temperature is set to 70-180 ° C, and the residence time is 3 min. Based on the total mass of the tri-block copolymer, 2% of a chain extender was added, and the above-mentioned material was extruded by a twin-screw, and then air-cooled to obtain a multi-block copolymer. Among them, the temperatures of zones 1 to 9 of the twin-screw extruder are: 80°C, 120°C, 140°C, 150°C, 150°C, 150°C, 150°C, 150°C, 150°C, and the head temperature is 140°C.

Embodiment 3

[0039] The steps of this example are the same as those of Example 1, except that in step 2, the above-mentioned esterified product is transferred to a polycondensation reaction kettle, and 14.07 g of catalyst n-butyl titanate (accounting for 0.3% of the total mass of segment I) is added, and 220 Stir at ℃ for 10 min, then control the vacuum degree to 2.5 kPa, and react for 1.5 h; then control the vacuum degree to within 30 Pa, and react for 2 h to obtain hydroxyl-terminated poly(propylene glycol succinate).

[0040] Step 3: Cool down the above-mentioned hydroxyl-terminated poly(1,2-propylene glycol succinate) to 160°C, add 45 kg L-lactide and 24.3 g stannous octoate (0.05% based on the total mass of the triblock copolymer), Vacuumize to 50 Pa, then close the valve, and conduct a vacuum-tight reaction for 14 h to obtain a hydroxyl-terminated poly(1,2-propylene succinate)-polylactic acid triblock copolymer.

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Abstract

The invention discloses a biodegradable multi-block copolymer and a preparation method thereof. The preparation method of the biodegradable multi-block copolymer comprises the three steps of chemical reaction that firstly, dibasic acid and dihydric alcohol react to generate a hydroxyl telechelic polyester intermediate, then the hydroxyl telechelic polyester intermediate reacts with lactide to obtain a polyester-polylactic acid triblock copolymer, and finally chain extension is performed by using a chain extender to obtain the multi-block copolymer. The raw materials of the biodegradable multi-block copolymer is wide in source, reaction conditions are easy to control, operation is convenient, and the biodegradable multi-block copolymer is suitable for industrial production. The copolymer has good biodegradability of aliphatic polyester, good thermodynamic properties and processing properties, also improves the PLA brittleness, is a high value-added product and has a wide application prospect in the fields of packaging materials and medical products.

Description

technical field [0001] The invention relates to a copolymer, in particular to a biodegradable multi-block copolymer and a preparation method thereof. Background technique [0002] Petroleum products such as fuels, chemical raw materials and polymer materials produced from petroleum have become an indispensable part of our life and production. The development and utilization of petroleum resources has brought about the development of society and the progress of human civilization, but also brought about environmental problems such as the greenhouse effect, white pollution and deterioration of the ecological environment. In response to the above problems, in recent years, more and more attention has been paid to degradable polymer materials, and its application fields involve packaging materials and medical products. In this class of materials, the main products are polylactic acid (PLA), polybutylene succinate (PBS), polyhydroxyalkanoate (PHA), polycaprolactone (PCL) and pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/60C08G63/91C08G18/76C08G18/42
CPCC08G18/4286C08G18/7671C08G63/60C08G63/916C08G2230/00
Inventor 刘岗戴清文王青青殷宏军陈涛俞利生李新方柏勇
Owner HANGZHOU XINFU TECH CO LTD