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Biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof

A multi-block copolymer and aliphatic polyester technology, which is applied in the field of biodegradable aliphatic polyester/aromatic polyester multi-block copolymer and its preparation and application, can solve the problem of limited impact strength improvement, fat Problems such as limited impact strength of family polyester

Active Publication Date: 2011-04-20
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the introduction of crystalline aromatic polyesters has very limited improvement in the impact strength of aliphatic polyesters.
Patent CN1796435 reports the method of introducing rigid maleopimaric anhydride copolymerized modified PBS, the copolymer has good elongation at break and bending strength, but the improvement of its impact strength is very limited

Method used

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  • Biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof
  • Biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof
  • Biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1, preparation high-performance biodegradable aliphatic polyester / aromatic polyester multi-block copolymer (PBS-b-PPT)

[0049] This embodiment prepares the method for high-performance biodegradable aliphatic polyester / aromatic polyester multi-block copolymer to comprise the steps:

[0050] 1) Preparation of hydroxyl-terminated crystalline prepolymer A

[0051] At room temperature, 2500 g of succinic acid and 1,4-butanediol in a molar ratio of 1:1.5, and 2 g of isopropyl titanate were first added to a 5 L reaction kettle replaced with high-purity nitrogen. At the same time, the reactor is equipped with a high-purity nitrogen inlet, a mechanical stirrer, and a condenser. The above reaction system was controlled at 170°C, stirred and reacted with nitrogen gas until the water yield reached 95% of the theoretical water yield, then the temperature was raised to 230°C, the pressure was slowly lowered to 50 Pa, and polycondensation was continued for 9 hours. Obtai...

Embodiment 2

[0063] Embodiment 2, preparation high-performance biodegradable aliphatic polyester / aromatic polyester multi-block copolymer

[0064] 1) Preparation of hydroxyl-terminated crystalline prepolymer 1

[0065] At room temperature, 2500 g of adipic acid and 1,4-butanediol in a molar ratio of 1:2.8, and 1.5 g of butyl titanate were added to a 5 L reaction kettle replaced with high-purity nitrogen. At the same time, the reactor is equipped with a high-purity nitrogen inlet, a mechanical stirrer, and a condenser. The above reaction system was controlled at 180°C, stirred and reacted with nitrogen gas until the water yield reached 90% of the theoretical water yield, then the temperature was raised to 250°C, the pressure was slowly lowered to 5Pa, and then polycondensed for 3 hours. The obtained prepolymer A had a hydroxyl value of 106.74, an acid value of 3.46 and a number average molecular weight of 1,000.

[0066] 2) Preparation of rigid amorphous prepolymer B terminated by hydroxy...

Embodiment 3

[0070] Embodiment 3, preparation high-performance biodegradable aliphatic polyester / aromatic polyester multi-block copolymer

[0071] The prepolymer prepared in step 1) and step 2) of Example 2 was dried at 100° C. for 3 hours. The prepolymer A, prepolymer B, HDI according to the molar ratio of 8:1:17, a total of 1000g, 1500mL DMF and 25g of stannous octoate were sequentially added to the 5L reactor replaced by high-purity nitrogen. The above reaction system was heated to 200°C for 3 hours, and an excess of cold methanol was added to the obtained polymer solution. Obtain the biodegradable polyester-polyester block copolymer provided by the present invention through separation and drying, its number average molecular weight is 249,600, molecular weight distribution is 3.2, tensile strength is 43MPa, elongation at break is 190%, impact strength It is 160J / m.

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Abstract

The present invention discloses a biodegradable aliphatic polyester / aromatic polyester multi-block copolymer and preparation method and application thereof. The copolymer is a AB-type multi-block copolymer composed of A chain segment and B chain segment; the number average molecular weight of the copolymer is 5,000-500,000, and the molecular weight distribution is 1-5; in the copolymer, the A chain segment is prepared by reacting C2-C12 aliphatic dibasic acids or esters, acyl chlorides, and anhydrides thereof with C2-C12 aliphatic diols; the B chain segment is prepared by reacting 1,2-propylene glycol with C8-C14 aromatic or alicyclic dibasic acids or esters, acyl chlorides, and anhydrides thereof. The present invention introduces rigid amorphous polyester chain segments into crystalline aliphatic polyesters to obtain a biodegradable aliphatic polyester / aromatic polyester multi-block copolymer, which maintains the biodegradability and at the same time improves the mechanical properties of aliphatic polyesters. In addition, the copolymer can be used as an environment friendly polymer material and an anti-impact modifier for biodegradable polymer materials such as poly(butylene succinate), polylactic acid, polyhydroxybutyrate, etc., and has high application value.

Description

technical field [0001] The invention relates to a biodegradable aliphatic polyester / aromatic polyester multi-block copolymer, a preparation method and application thereof. Background technique [0002] Due to its excellent performance, petroleum-based plastics are widely used in all aspects of production and life, but because they are not degradable in the environment, the long-term use of ordinary plastics has led to serious "white pollution" problems. To fundamentally solve the "white pollution", only the research and development of biodegradable materials. Compared with other biodegradable materials, aliphatic polyester is currently the most competitive biodegradable material in terms of price. However, aliphatic polyesters have not been widely used so far. This is mainly because its price is much higher than that of ordinary polyolefin materials, and on the other hand, its mechanical properties are not good enough. [0003] In contrast, traditional aromatic polyesters...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G63/16C08G63/183C08G63/189C08G63/199C08G63/185C08L87/00
Inventor 郑柳春李春成张栋管国虎肖耀南
Owner INST OF CHEM CHINESE ACAD OF SCI
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