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High-flowability and high-crystallinity polylactic acid composition based on hyperbranched poly(ester-hydrazide)

A technology of hyperbranched poly- and poly-lactic acid is applied in the field of polymer processing and modification, which can solve the problems of no promotion of PLA crystallization, and achieve the effects of improving flow performance, easy industrialization of the method and process, and simple method and process.

Pending Publication Date: 2022-01-25
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently studied hyperbranched polyesters do not promote the crystallization of PLA, so it is still a huge challenge to prepare PLA thin-walled injection molding compositions with high fluidity and high crystallization properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, 0.1 mol of isophthalic acid-5-sodium sulfonate, 0.5 mol of citric acid, 1.0 mol of lactic acid, 0.1 mol of oxalic acid dihydrazide and 0.3 g of p-toluenesulfonic acid are added to the reactor, in N 2 Stirring and reacting under the condition of atmosphere and 180° C. for 25 hours, and then dehydrating under the conditions of 180° C. and 0.001 MPa to obtain hyperbranched poly(ester-hydrazide).

[0033] Get the hyperbranched poly(ester-hydrazide) 5g that obtains above, it is 10g / 10min, the polylactic acid that optical purity is 98% and 1g adipate diphenyl dihydrazide carry out manual mixing with 1000g melt index, then Extrude and granulate through a screw extruder at 190° C. to finally obtain modified polylactic acid particles. After testing, the melt index of the modified polylactic acid is 20g / 10min, and the DSC isothermal crystallization time at 110°C is 20s.

Embodiment 2

[0035] First, 0.1 mol of isophthalic acid-5-sodium sulfonate, 1.0 mol of citric acid, 1.5 mol of lactic acid, 0.15 mol of malonic acid dihydrazide and 1.9 g of methanesulfonic acid were added to the reactor. 2 Under the condition of atmosphere and 150° C., the mixture was stirred and reacted for 20 hours, and then dehydrated under the conditions of 160° C. and 0.01 MPa to obtain hyperbranched poly(ester-hydrazide).

[0036] Get the hyperbranched poly(ester-hydrazide) 50g that obtains above, it is 10g / 10min, the polylactic acid that optical purity is 99% and 10g adipate diphenyl dihydrazide carry out manual mixing with 1000g melt index, then Extrude and granulate through a screw extruder at 190° C. to finally obtain modified polylactic acid particles. After testing, the melt index of the modified polylactic acid is 52g / 10min, and the DSC isothermal crystallization time at 110°C is 16s.

Embodiment 3

[0038] First, 0.1 mol of isophthalic acid-5-sodium sulfonate, 1.5 mol of citric acid, 2.0 mol of lactic acid, 0.2 mol of succinic acid dihydrazide and 5.2 g of tetrabutyl titanate were added to the reactor. N 2 Stirring and reacting under the condition of atmosphere and 130° C. for 15 hours, and then dehydrating under the conditions of 140° C. and 0.005 MPa to obtain hyperbranched poly(ester-hydrazide).

[0039] Get the hyperbranched poly(ester-hydrazide) 80g that obtains above, it is 5g / 10min with 1000g melting index, the polylactic acid that optical purity is 98% and 25g trimesisamide carry out manual mixing, then at 190 ℃ by screw The extruder performs extrusion granulation to finally obtain modified polylactic acid particles. After testing, the melt index of the modified polylactic acid is 85g / 10min, and the DSC isothermal crystallization time at 110°C is 12s.

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Abstract

The invention provides a high-flowability and high-crystallinity polylactic acid composition based on hyperbranched poly(ester-hydrazide). The high-flowability and high-crystallinity polylactic acid composition comprises polylactic acid, a nucleating agent and hyperbranched poly(ester-hydrazide). Hyperbranched poly(ester-hydrazide) is obtained through condensation polymerization of structural units such as sodium 5-sulfoisophthalic acid, citric acid, lactic acid and dihydrazide. The m-phthalic acid-5-sodium sulfonate structural unit in the hyperbranched poly(ester-hydrazide) can effectively improve the dispersion degree of the nucleating agent in the polylactic acid in the composition; meanwhile, a dihydrazide structural unit in the hyperbranched poly(ester-hydrazide) can rapidly induce self-assembly of the nucleating agent in polylactic acid, so that compared with the prior art, the crystallization promoting effect of the nucleating agent on polylactic acid is effectively improved. In addition, the hyperbranched poly(ester-hydrazide) can also significantly improve the flowing property of the polylactic acid.

Description

technical field [0001] The invention relates to the technical field of polymer processing and modification, in particular to a polylactic acid composition with high fluidity and high crystallinity based on hyperbranched poly(ester-hydrazide). Background technique [0002] In recent years, with the rapid development of the food delivery industry, my country has generated a huge demand for thin-walled injection molded tableware (such as disposable lunch boxes, milk tea cups, etc.), and the annual consumption has reached more than 1 million tons. At present, the thin-walled injection-molded tableware commonly used in the market is mainly made of refractory polypropylene (PP) materials. However, due to the short service life and high recycling cost of disposable thin-wall injection molded tableware, the recycling rate is very low, which will cause serious environmental pollution after use. Therefore, there is an urgent need to seek more environmentally friendly solutions for thi...

Claims

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Application Information

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IPC IPC(8): C08G73/08C08G63/688C08L67/04C08L67/00C08L79/06C08K5/25C08K5/20
CPCC08G73/08C08G63/688C08G83/005C08L67/04C08L2205/24C08L67/00C08L79/06C08K5/25C08K5/20Y02W90/10
Inventor 刘振伟方璞张兰山唐越张二虎曲鹏飞麻宁
Owner WANHUA CHEM GRP CO LTD
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