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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

Active Publication Date: 2022-02-18
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nucleating agents are mainly divided into organic nucleating agents and inorganic nucleating agents. Among them, commonly used organic nucleating agents, such as ethylene bis stearamide (EBS), TMC-306, and TMC-300, are prone to precipitation. Disadvantages, not suitable for application in the field of food packaging; commonly used inorganic nucleating agents, such as talcum powder, montmorillonite, calcium carbonate, zinc oxide, have poor compatibility with polylactic acid, resulting in uneven crystallization of polylactic acid and poor product quality

Method used

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  • 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
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  • 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

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preparation example Construction

[0035] The present invention provides the preparation method of the rare earth nucleating agent described in the above technical scheme, comprising the following steps:

[0036] Mixing a ligand compound, a surfactant, a coupling agent and water to obtain a first solution; the ligand compound includes lactic acid and / or sodium lactate;

[0037] Dissolving the rare earth compound to obtain a second solution; the rare earth compound includes one or more of rare earth nitrate, rare earth chloride and rare earth oxalate;

[0038] The second solution is added dropwise to the first solution for coordination reaction to obtain a precipitate; the precipitate is successively centrifuged, filtered and dried to obtain the rare earth nucleating agent.

[0039] In the present invention, the ligand compound, surfactant, coupling agent and water are mixed to obtain the first solution. In the present invention, the ligand compound includes lactic acid and / or sodium lactate; the present invent...

Embodiment 1

[0062] (1) Preparation of rare earth nucleating agent

[0063] The pH value of the aqueous lactic acid solution (55% in mass concentration) was adjusted to 7, and then the adjusted pH value of the aqueous lactic acid solution, the biosurfactant sophorolipid and the silane coupling agent KH550 were added to a three-necked flask to obtain the first solution;

[0064] Cerium nitrate is dissolved in ethanol to obtain a second solution;

[0065] Control the heating temperature of the water bath to 30°C, gradually add the second solution to the first solution dropwise, the molar ratio of cerium nitrate, lactic acid, sophorolipid and KH550 is 1:3:0.002:0.002, and the second solution is within 0.5h After dripping, stir for 2 hours to carry out coordination reaction to obtain white precipitate of cerium lactate; centrifuge and filter the white precipitate of cerium lactate, and then dry it in a vacuum oven at 70°C for 24 hours to obtain cerium lactate powder, which is the rare earth nu...

Embodiment 2

[0070] (1) Preparation of rare earth nucleating agent

[0071] The pH value of the sodium lactate aqueous solution (mass concentration is 60%) is adjusted to 8, then the sodium lactate aqueous solution after the pH value adjustment, the nonionic surfactant polyoxyethylene fatty alcohol ether and the silane coupling agent KH560 are added in the three-necked flask, obtain the first solution;

[0072] Lanthanum chloride is dissolved in isoamyl alcohol to obtain a second solution;

[0073] Control the heating temperature of the water bath to 40°C, gradually add the second solution to the first solution dropwise, the molar ratio of lanthanum chloride, sodium lactate, polyoxyethylene fatty alcohol ether and KH560 is 1:4:0.002:0.005, the second solution Finish dropping within 1 hour, and stir for 5 hours after dropping to carry out coordination reaction to obtain a white precipitate of lanthanum lactate; centrifuge and filter the white precipitate of lanthanum lactate, and then dry it...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08J5/18C08L67/04C07F5/00
CPCC08K5/0091C08J5/18C07F5/00C08J2367/04Y02W90/10
Inventor 刘跃军吴银财郝喜海范淑红陈丽莉甘典松李儒剑李德水
Owner HUNAN UNIV OF TECH
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