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Phosphorus-containing copolyester for toughening flame-retardant polylactic acid and preparation method ofcopolyester

A technology of copolyester and polylactic acid, which is applied in the field of phosphorus-containing copolyester and preparation of toughened flame-retardant polylactic acid, can solve the problems of gap, limited improvement, limited notched impact strength, etc., and achieve improved toughness and good flexibility , the effect of improving the compatibility of the two-phase interface

Pending Publication Date: 2022-02-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toughened flame-retardant polylactic acid prepared is mainly reflected in the improvement of the elongation at break, and the improvement of the notched impact strength is very limited.
The polylactic acid material that can pass the UL-94 vertical burning V-0 grade has an impact strength of about 6~18kJ / m 2 , the improvement is still relatively limited, away from "super tough polylactic acid" (notched impact strength> 530J / m or 53kJ / m 2 ) still has a considerable gap

Method used

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  • Phosphorus-containing copolyester for toughening flame-retardant polylactic acid and preparation method ofcopolyester
  • Phosphorus-containing copolyester for toughening flame-retardant polylactic acid and preparation method ofcopolyester
  • Phosphorus-containing copolyester for toughening flame-retardant polylactic acid and preparation method ofcopolyester

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The phosphorus-containing monomer is diethyl phosphite, the molar ratio of structural units [I] and [II] is 6:4, and the molar ratio of structural units [III], [IV] and [V] is 6:2:2, All the monomers and the catalyst tetrabutyl titanate (0.5%) were fully mixed, stirred and reacted in a nitrogen atmosphere at 170°C for 3 hours, and reacted at 190°C for 3 hours in a vacuum, named CP1.

Embodiment 2

[0029] The phosphorus-containing monomer is dimethyl methyl phosphate, the molar ratio of structural units [I] and [II] is 5:5, and the molar ratio of structural units [III], [IV] and [V] is 4:5:1 , all the monomers and the catalyst zinc acetate (0.3%) were fully mixed, stirred and reacted at 160°C for 5h in a nitrogen atmosphere, and reacted at 190°C for 5h under vacuum, named CP2.

Embodiment 3

[0031] The phosphorus-containing monomer is diethyl ethyl phosphate, the molar ratio of structural units [I] and [II] is 4:6, and the molar ratio of structural units [III], [IV] and [V] is 5:3:2 , mix all the monomers and the catalyst antimony trioxide (0.5%) thoroughly, stir and react in a nitrogen atmosphere at 160°C for 5h, and react at 190°C for 4h under vacuum, named CP3.

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Abstract

The invention belongs to the field of polylactic acid toughening modification, and particularly discloses phosphorus-containing copolyester for toughening flame-retardant polylactic acid and a preparation method of the copolyester. A copolyester with a main chain containing phosphorus and a side group containing hydroxyl is synthesized, and is subjected to melt reactive blending with polylactic acid under the action of diisocyanate, a macromolecular compatibilization grafted copolymer is generated in situ, and the two-phase interface interaction is improved. The elongation at break of the polylactic acid composite material can reach 200% or above, the notch impact strength can reach 53 kJ / m < 2 > or above, the limit oxygen index is greater than 26%, and the vertical combustion can pass the UL-94V-0 grade.

Description

technical field [0001] The invention belongs to the field of toughening and modifying polylactic acid, and specifically discloses a phosphorus-containing copolyester for toughening and flame-retardant polylactic acid and a preparation method thereof. Background technique [0002] Poly(Lactic Acid) is currently the most important biosourced and biodegradable polymer material, commonly used in food packaging bags, disposable tableware, 3D printing, etc. However, the PLA material is brittle and sensitive to notches, and the notched impact strength is only 2-4kJ / m 2 . At the same time, the limiting oxygen index of PLA is only about 18%. Once it is ignited in the air, the flame will spread rapidly. Therefore, in order to improve the use value of polylactic acid and broaden its application fields, it must be toughened and flame-retardant modified. [0003] There are many ways to toughen polylactic acid, such as copolymerization, plasticization, blending and so on. Among them, ...

Claims

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Application Information

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IPC IPC(8): C08G63/692C08G63/83C08G63/85C08G63/86C08L67/04C08L75/06
CPCC08G63/692C08G63/85C08G63/83C08G63/866C08L67/04C08L2201/02C08L75/06
Inventor 杨荣顾国章李锦春邹国享赵彩霞张鑫
Owner CHANGZHOU UNIV
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