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Preparation and application methods of cellulose derivative-grafted polylactic acid

A technology of cellulose derivatives and grafted polylactic acid, which is applied in the field of medicine, can solve problems such as cumbersome preparation methods, safety issues, and long process routes, and achieve the effects of improving mechanical properties and saving time and technology

Pending Publication Date: 2019-03-12
HUBEI GUANCHENG BIODEGRADABLE PLASTIC PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 103193964 A discloses a method similar to the above, first dissolving cellulose in ionic liquid to obtain a cellulose / ionic liquid solution; adding an acylating agent to the cellulose / ionic liquid solution for homogeneous acylation of cellulose Reaction; add cyclic lactide monomer to carry out ring-opening graft copolymerization reaction again, obtain cellulose ester graft copolymer, above-mentioned preparation method is all comparatively loaded down with trivial details, and use lactide ring-opening polymerization to have relatively high purity to raw material high demands
[0005] In order to provide relatively simple cellulose-grafted polylactic acid copolymers, patent CN105504235A provides a method for preparing cellulose-grafted polylactic acid copolymers using cellulose as a raw material, mixing cellulose, an organic base and an organic solvent, and then mixing with CO 2 reaction to obtain a cellulose-based CO 2 A solution of reversible polyionic compounds; adding cyclic lactide monomers for ring-opening graft copolymerization to obtain cellulose ester graft copolymers, but the preparation method in the patent still needs to use high-purity lactide monomers Body, and the process route is longer
[0006] Both patent CN107011640A and patent CN107698951A provide polyurethane-modified cellulose obtained by reacting isocyanate with cellulose, which can be used as an interfacial compatibilizer for polylactic acid and cellulose to improve the mechanical properties of composite materials, but toxic isocyanate is required in the above patents , there are potential safety issues in the field of food packaging

Method used

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  • Preparation and application methods of cellulose derivative-grafted polylactic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The method for preparing cellulose-grafted polylactic acid of the present invention is that the solvent is toluene, and when 20 liters of toluene is heated to a temperature of 60° C., 1000 grams of ethyl cellulose is added, and after stirring until the ethyl cellulose is completely dissolved, polylactic acid is added. 1000g (commercial polylactic acid produced by NatureWorks and Hisun), heated up to 100°C, stirred until the polylactic acid was completely dissolved, added 20g of stannous octoate as a catalyst, heated to toluene under reflux for 5 hours, and formed through the solution after reaction. The method of preparing a composite film is to prepare a composite film. Specifically, the solution is spread on a horizontally adjusted film by the casting film method, placed in a fume hood, and naturally air-dried at room temperature for 48 hours, and then dried in a vacuum oven for 24 hours (40°C) ), remove the membrane and store in a desiccator for later use. Measure it...

Embodiment 2

[0064] The method for preparing cellulose-grafted polylactic acid of the present invention is: when 10 liters of toluene is heated to a temperature of 60° C., 400 grams of ethyl cellulose is added, and the ratio of ethyl cellulose and PLA is 2 / 8. After the base cellulose is completely dissolved, add 1000 grams of polylactic acid, heat up to 100°C, stir until the polylactic acid is completely dissolved, add 8 grams of stannous octoate as a catalyst, heat to toluene under reflux for 5 hours, and form a film through the solution after the reaction To prepare a composite film, specifically spread the solution on a horizontally adjusted film tool by casting a film method, put it in a fume hood, let it dry naturally at room temperature for 48 hours, and then dry it in a vacuum oven for 24 hours (40°C). The lower membrane is placed in a desiccator for later use. Determine its tensile stress-strain curve (tested by CMT4104 electronic universal testing machine of Shenzhen Xinsansi Mate...

Embodiment 3

[0067] The method for preparing cellulose-grafted polylactic acid of the present invention is as follows: when heating 20 liters of xylene to a temperature of 60° C., add 1000 grams of ethyl cellulose, stir until the ethyl cellulose is completely dissolved, add 1000 grams of polylactic acid, Raise the temperature to 100°C, stir until the polylactic acid is completely dissolved, add 10 grams of stannous octoate as a catalyst, and heat to react for 5 hours under the reflux of toluene; after the reaction, a composite film is prepared by the method of solution film formation, specifically, the solution is cast into a film Lay it flat on a horizontally adjusted film tool, put it in a fume hood, and let it dry naturally at room temperature for 48 hours, and then dry it in a vacuum oven for 24 hours (40°C) to obtain a composite film.

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Abstract

The invention relates to preparation and application methods of a cellulose derivative-grafted polylactic acid. The preparation method of the cellulose derivative-grafted polylactic acid comprises thefollowing steps of dissolving cellulose derivatives into solvent, then completely stirring and dissolving in polylactic acid; adding in catalysts and increasing the temperature for reaction; performing vacuum drying to obtain the cellulose derivative-grafted polylactic acid. The prepared cellulose derivative-grafted polylactic acid is applied to fully biodegradable films to improve two-phase interface compatibility, mechanical performance and transparency of a polylactic acid-cellulose composite film. According to the preparation method the cellulose derivative-grafted polylactic acid, the applied polylactic acid is commercial polylactic acid and reacts with the cellulose derivative through transesterification to prepare the cellulose derivative-grafted polylactic acid, which can serve asan interfacial solubilizer for polylactic acid / cellulose composite materials to improve the mechanical performance of the polylactic acid / cellulose composite materials. The preparation method of thecellulose derivative-grafted polylactic acid avoids the problems of high reaction requirements and expensive catalysts of ring-opening polymerization of high-purity lactide monomers and is easy to industrialize.

Description

technical field [0001] The invention belongs to the field of medicine, and relates to a preparation method and application of cellulose derivative grafted polylactic acid. Background technique [0002] PLA is a biodegradable thermoplastic aliphatic polyester artificially synthesized from biological plants. PLA can be completely degraded into small molecules in the natural environment. PLA can be processed by common plastic processing methods, such as extrusion, molding, casting, melt spinning, solution spinning, blow molding, etc. Therefore, PLA can replace the existing petroleum-based plastic products and solve the problem of environmental pollution. Especially in the field of packaging, PLA has good gloss and transparency, good oxygen permeability, air permeability and carbon dioxide permeability, so it can be used to make biaxially stretched films and fresh-keeping packaging materials, replacing the current general petroleum-based plastic films. Materials such as polypro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00
CPCC08G81/00
Inventor 周焕珍
Owner HUBEI GUANCHENG BIODEGRADABLE PLASTIC PRODS
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