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A kind of nano-cellulose modified polylactic acid composite material and preparation method thereof

A technology of nanocellulose and composite materials, which is applied in the field of nanocellulose-modified polylactic acid composite materials and their preparation, can solve problems such as the interaction strength between nanocellulose and compatibilizer, and the notched impact strength of materials. It can greatly improve the problems such as improving the elongation at break and impact strength, improving the interfacial force and good compatibility.

Active Publication Date: 2021-02-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method can improve the interfacial compatibility of nanocellulose and polylactic acid to a certain extent, but does not take into account the interaction strength between nanocellulose and compatibilizer, which may lead to the failure of notched impact strength and other properties of the material. One of the reasons for the increase

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  • A kind of nano-cellulose modified polylactic acid composite material and preparation method thereof
  • A kind of nano-cellulose modified polylactic acid composite material and preparation method thereof

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Embodiment 1

[0032] In this embodiment, the nanocellulose modified polylactic acid composite material includes the following components in weight percentage: 90% polylactic acid, 2.5% nanocellulose, 7% polyethylene glycol, and 0.5% cyclodextrin; its preparation method includes The following steps:

[0033] 1. Prepare respectively 15% α-cyclodextrin (α-cyclodextrin is 0.3g) aqueous solution and 10% polyethylene glycol-1000 (polyethylene glycol-1000 is 4.2g) with a weight concentration of 15% aqueous solution, and ultrasonically dispersed for 60 minutes; under the condition of keeping stirring, add polyethylene glycol-1000 aqueous solution drop by drop to α-cyclodextrin aqueous solution, after the dropwise addition, ultrasonically disperse for 60 minutes to obtain α-cyclodextrin-polyethylene glycol Ethylene glycol clathrate;

[0034] 2. Prepare an aqueous solution of nanocellulose (nanocellulose is 1.5 g) with a weight concentration of 0.5%, ultrasonically disperse it for 60 minutes, mix an...

Embodiment 2

[0038] In this embodiment, the nanocellulose modified polylactic acid composite material includes the following components in weight percentage: 90% polylactic acid, 2.5% nanocellulose, 7% polyethylene glycol, and 0.5% cyclodextrin; its preparation method includes The following steps:

[0039]1. Prepare the aqueous solution of 15% α-cyclodextrin (α-cyclodextrin is 0.3g) and the polyethylene glycol-2000 (polyethylene glycol-2000 is 4.2g) of 10% weight concentration respectively aqueous solution, and ultrasonically dispersed for 60 minutes; under the condition of keeping stirring, the polyethylene glycol-2000 aqueous solution was added dropwise to the α-cyclodextrin aqueous solution, and after the dropwise addition, ultrasonically dispersed for 60 minutes to obtain α-cyclodextrin-poly Ethylene glycol clathrate;

[0040] 2. Prepare an aqueous solution of nanocellulose (nanocellulose is 1.5 g) with a weight concentration of 0.5%, ultrasonically disperse it for 60 minutes, mix and...

Embodiment 3

[0044] In this embodiment, the nanocellulose modified polylactic acid composite material includes the following components in weight percentage: polylactic acid 89%, nanocellulose 5%, polyethylene glycol 5%, cyclodextrin 1%; its preparation method includes The following steps:

[0045] 1. Prepare the aqueous solution of 15% α-cyclodextrin (α-cyclodextrin is 0.6g) and the polyethylene glycol-2000 (polyethylene glycol-2000 is 3g) aqueous solution with a weight concentration of 10% respectively , and ultrasonically dispersed for 60 minutes; under the condition of keeping stirring, the polyethylene glycol-2000 aqueous solution was added dropwise to the α-cyclodextrin aqueous solution, and after the addition was completed, ultrasonically dispersed for 60 minutes to obtain α-cyclodextrin-polyethylene Diol clathrate;

[0046] 2. Prepare an aqueous solution of nanocellulose (nanocellulose is 3 g) with a weight concentration of 0.5%, ultrasonically disperse for 60 minutes, mix and sti...

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Abstract

The invention discloses a nano-cellulose-modified polylactic acid composite material and a preparation method thereof. Cyclodextrin-polyethylene glycol inclusion compound is used as a compatibilizer, and the cyclodextrin on the inclusion compound and the surface of nano-cellulose Hydroxyl groups form hydrogen bond interactions, polyethylene glycol has good compatibility with polylactic acid, promotes good dispersion of nanocellulose in the matrix, and improves the interfacial force between nanocellulose and polylactic acid. Effectively transmit the applied load, and realize the simultaneous improvement of the tensile strength, elongation at break and impact strength of the composite material. The preparation process of the invention is simple, and the production and use process is green and environment-friendly.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a nano-cellulose modified polylactic acid composite material and a preparation method thereof. Background technique [0002] Due to the depletion of petroleum resources and the environmental pollution caused by the frequent use of petroleum-based materials, human beings are urgently looking for a green and environmentally friendly material that is rich in sources and biodegradable. Polylactic acid is derived from plant resources, rich in sources, and is a degradable polyester material. As we all know, it has many advantages, but it also has disadvantages such as brittleness, weak crystallization ability, and insufficient mechanical properties, which limit the large-scale use of polylactic acid. Nanocellulose is also derived from plant resources, and it also has the advantages of light weight, high modulus, high strength and good biocompatibility. Uniformly dispersing nano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L1/02C08L71/02C08L5/16C08J3/00
Inventor 方华高王生林谢启铮陈旭程盛丁运生
Owner HEFEI UNIV OF TECH
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