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Method for manufacturing biologically degradable polyester composite material with capacity increasing function

A technology for degrading polyester and composite materials. It is applied in the field of polymer materials. It can solve the problems of affecting crystallization performance, poor compatibility, and destroying the order of molecular chains in polylactic acid, so as to improve mechanical properties and compatibility. The effect of sex and good volume-increasing effect

Inactive Publication Date: 2008-08-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, aliphatic polyesters or aliphatic-aromatic copolyesters generally have longer -(CH 2 ) n -segment, flexibility is relatively good, so mixing it into polylactic acid can improve the brittleness of polylactic acid; secondly, the introduction of chain segments with different properties will destroy the order of molecular chains in polylactic acid and affect its crystallization performance. Will partially reduce the brittleness of PLA materials
However, the compatibility of aliphatic polyester or aliphatic-aromatic copolyester blended with polylactic acid is not good, so that the improvement of mechanical properties of polylactic acid / degradable polyester blend material is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 5g polylactic acid is vacuum-dried (moisture content<50ppm), adds in the reactor, adds small molecule glycol, vacuumizes, and reacts under catalyst action, and the pressure in the reactor is 0.01Pa, and reaction temperature is React at 165°C for 3 hours to obtain polylactic acid diol, the hydroxyl-terminated product of polylactic acid; wherein, the molar ratio of small molecule diol to polylactic acid is 1.5:1;

[0033] (2) 5g of PBAT is vacuum-dried (moisture content<50ppm), put into the reactor, add small molecule glycol, vacuumize, and react under the action of catalyst, the pressure in the reactor is 0.01Pa, and the reaction temperature is 200 ℃, reacted for 5 hours, and obtained degradable polyester diol, which is a hydroxyl-terminated product of biodegradable polyester; wherein, the molar ratio of small molecule diol and degradable polyester is 1.5:1;

[0034] (3) Put the end-capped polylactic acid and PBAT into the vacuum reaction kettle, add 0.005 g of the c...

Embodiment 2

[0037] (1) 8g polylactic acid is vacuum-dried (moisture content<50ppm), adds in the reactor, adds small molecule glycol, vacuumizes, and reacts under catalyst action, and the pressure in the reactor is 0.01Pa, and reaction temperature is React at 165°C for 3 hours to obtain polylactic acid diol, the hydroxyl-terminated product of polylactic acid; wherein, the molar ratio of small molecule diol to polylactic acid is 1.5:1;

[0038] (2) 2g of PBAT is vacuum-dried (moisture content<50ppm), put into the reactor, add small molecular dihydric alcohol, vacuumize, react under the action of catalyst, the pressure in the reactor is 0.01Pa, and the reaction temperature is 200 ℃, reacted for 5 hours, and obtained degradable polyester diol, which is a hydroxyl-terminated product of biodegradable polyester; wherein, the molar ratio of molecular diol and degradable polyester reaction is 1.5:1;

[0039] (3) Put the end-capped polylactic acid and PBAT into the vacuum reactor, add 0.005 g of th...

Embodiment 3

[0042] (1) Vacuum-dry 8.5g polylactic acid (moisture content < 50ppm), add it to the reactor, add small molecular glycol, vacuumize, and react under the action of a catalyst. The pressure in the reactor is 0.01Pa, and the reaction temperature at 165°C, and reacted for 3 hours to obtain polylactic acid diol, a hydroxyl-terminated product of polylactic acid; wherein, the molar ratio of small molecule diol to polylactic acid is 1.5:1;

[0043] (2) 1.5g PBS is vacuum-dried (moisture content<50ppm), adds in the reactor, adds small molecule glycol, vacuumizes, and reacts under catalyst action, and the pressure in the reactor is 0.01Pa, and reaction temperature is React at 190°C for 5 hours to obtain degradable polyester diol, a hydroxyl-terminated product of biodegradable polyester; wherein, the molar ratio of molecular diol to degradable polyester is 1.5:1;

[0044] (3) Put the end-capped polylactic acid and PBS into the vacuum reactor, add 0.005 g of the catalyst stannous chloride...

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PUM

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Abstract

The invention belongs to the technical field of polymer materials, which more particularly relates to a preparation method of a biological decomposable polyester composite material with compatibilization function. The specific steps are that: a method of small molecular diol hydroxyl end capping is adopted for preparing polylactic acid and biological decomposable polyester diol, a diisocyanate series chain extender is used for preparing the block copolymer of the polylactic acid and the decomposable polyester by a method of fusion chain extension, and the block copolymer is used in a blend system of the polylactic acid and the corresponding polyester to play the role of compatibilization function. The preparation method of the biological decomposable polyester composite material is simple in method and technique, easy in industrial production and the prepared block copolymer can increase the compatibility of the polylactic acid and the biological decomposable polyester blend system effectively and play the role of a compatibilizer.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a biodegradable polyester composite material with a compatibilizing function. Background technique [0002] Polylactic acid (Poly lactic acid, PLA) comes from renewable natural plants, such as sweet potatoes, corn and other grains can be used as its raw materials. With its good biodegradability, absorbability, and good mechanical properties, polylactic acid is suitable for various processing methods such as blow molding, injection molding, and extrusion. It has become the focus of biomaterial research and can be applied to industrial and agricultural production fields such as agricultural films, aquatic products, paper bag supplies, and slow-release materials for pesticides and fertilizers. However, PLA is hard and has poor toughness, low elongation at break, low impact strength, lack of flexibility and elasticity, and is easy to ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/526C08K5/20C08K5/09B29C47/92C08L67/02B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/40B29C2948/92895
Inventor 任杰刘万强任天斌
Owner TONGJI UNIV
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