Rare earth nucleating agent and preparation method and application thereof as well as high-crystallinity modified polylactic acid film and preparation method and application thereof

A technology of high crystallinity and nucleating agent, applied in the field of packaging materials, can solve the problems of uneven crystallization of polylactic acid, poor compatibility of polylactic acid, poor product quality, etc. Effect
CN114058076AActive Publication Date: 2022-02-18HUNAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV OF TECH
Publication Date
2022-02-18

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Abstract

The invention provides a rare earth nucleating agent and a preparation method and application thereof as well as a high-crystallinity modified polylactic acid film and a preparation method and application thereof, and relates to the technical field of packaging materials. The rare earth nucleating agent provided by the invention is a lactic acid rare earth complex, rare earth elements in the rare earth nucleating agent can generate a strong coordination effect on carboxylic acid in polylactic acid, and a lactic acid ligand in the rare earth nucleating agent is a synthetic raw material of the polylactic acid and has good compatibility with the polylactic acid; and the rare earth nucleating agent can improve the crystallinity of polylactic acid through dual mechanisms of heterogeneous nucleation crystallization and climbing crystallization at the same time, and the crystallization promoting effect is remarkable. The invention further provides the high-crystallinity modified polylactic acid film, due to the addition of the rare earth nucleating agent, the high-crystallinity modified polylactic acid film has high crystallinity and excellent comprehensive performance; and moreover, the rare earth nucleating agent, the plasticizer and the flexibilizer can synergistically modify the polylactic acid, the comprehensive performance of the polylactic acid can be further improved, and the high-crystallinity modified polylactic acid film can be applied to food packaging.
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Description

technical field

[0001] The invention relates to the technical field of packaging materials, in particular to a rare earth nucleating agent, a preparation method and application thereof, a high-crystallinity modified polylactic acid film, and a preparation method and application thereof. Background technique

[0002] The synthetic raw materials of polylactic acid come from non-petrochemical products. After use, it can be biodegraded and returned to nature. It has the characteristics of environmental friendliness. It is more and more widely used in various packaging materials and is expected to replace some non-degradable polymer packaging materials synthesized by petrochemicals. .

[0003] However, polylactic acid itself has the defect of low crystallinity, which greatly limits the application range. To solve the defect of low crystallinity of polylactic acid, the most common method is to add a nucleating agent to polylactic acid. At present, nucleating agents are mainly di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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