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Polylactic acid-bacterial cellulose composite material and preparation method thereof

A technology of bacterial cellulose and composite materials, applied in the field of biomaterials, can solve problems such as poor interface adhesion and thermodynamic incompatibility, and achieve the effects of reduced water absorption, high tensile strength and bending strength, and excellent mechanical properties

Inactive Publication Date: 2016-01-13
SUZHOU COSMETIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophobicity of polylactic acid and the water absorption of starch and cellulose, the two components are thermodynamically incompatible, resulting in poor interfacial cohesion between the components.

Method used

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  • Polylactic acid-bacterial cellulose composite material and preparation method thereof
  • Polylactic acid-bacterial cellulose composite material and preparation method thereof

Examples

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Embodiment 1

[0018] A polylactic acid-bacterial cellulose medical composite material, comprising the following components in parts by weight: 36 parts of polylactic acid, 34 parts of bacterial cellulose, 6 parts of graphene, 2-methacryloyloxyethyl phosphoryl 0.1 part of choline, 2 parts of proanthocyanidin, 2 parts of polyethylene glycol, 0.2 part of calcium chloride, 1 part of calcium stearate and 1 part of bentonite.

[0019] The preparation method comprises the steps of:

[0020] (1) Dry the polylactic acid in an oven at 50°C until the quality is constant, and set aside;

[0021] (2) The dried polylactic acid, bacterial cellulose and graphene are ultrafinely pulverized in step (1), mixed evenly, put into ethanol, and stirred rapidly to make a dispersion;

[0022] (3) Mix the polylactic acid dried in step (2) and other raw materials evenly, add them to the co-rotating twin-screw compounding extruder to extrude and granulate, and set the temperature of each section of the extruder to 100...

Embodiment 2

[0024] A polylactic acid-bacterial cellulose medical composite material, comprising the following components in parts by weight: 40 parts of polylactic acid, 40 parts of bacterial cellulose, 8 parts of graphene, 2-methacryloyloxyethyl phosphoryl 5 parts of choline, 3 parts of proanthocyanidin, 3 parts of polyethylene glycol, 0.4 part of calcium chloride, 2 parts of calcium stearate and 2 parts of mica.

[0025] The preparation method comprises the steps of:

[0026] (1) Dry the polylactic acid in an oven at 50°C until the quality is constant, and set aside;

[0027] (2) The dried polylactic acid, bacterial cellulose and graphene are ultrafinely pulverized in step (1), mixed evenly, put into ethanol, and stirred rapidly to make a dispersion;

[0028] (3) Mix the polylactic acid dried in step (1) and the remaining raw materials in step (2) evenly, and add them to the co-rotating twin-screw compounding extruder to extrude and granulate, and the temperature of each section of the...

Embodiment 3

[0030] A polylactic acid-bacterial cellulose medical composite material, comprising the following components in parts by weight: 41 parts of polylactic acid, 42 parts of bacterial cellulose, 9 parts of graphene, 2-methacryloxyethyl phosphoryl 6 parts of choline, 3 parts of proanthocyanidin, 3 parts of polyethylene glycol, 0.5 part of calcium chloride, 2 parts of calcium stearate and 2 parts of kaolin.

[0031] The preparation method comprises the steps of:

[0032] (1) Dry the polylactic acid in an oven at 55°C until the quality is constant, and set aside;

[0033] (2) The dried polylactic acid, bacterial cellulose and graphene are ultrafinely pulverized in step (1), mixed evenly, put into ethanol, and stirred rapidly to make a dispersion;

[0034] (3) Mix the polylactic acid dried in step (1) and the remaining raw materials in step (2) evenly, and add them to the co-rotating twin-screw compounding extruder to extrude and granulate, and the temperature of each section of the ...

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Abstract

The invention provides a polylactic acid-bacterial cellulose composite material and a preparation method thereof. The composite material comprises polylactic acid, bacterial cellulose, graphene, 2-methacryloyloxyethyl phosphorylcholine, proanthocyanidins, polyethylene glycol, calcium chloride, a lubricant and an assistant. The preparation method comprises the following steps: drying polylactic acid; carrying out ultrafine crushing on the dried polylactic acid, the bacterial cellulose and graphene, and putting the crushed material in ethanol to prepare a dispersion solution; and carrying out room temperature volatilization on the dispersion solution to remove ethanol, uniformly mixing the ethanol removed dispersion with residual raw materials, adding the obtained mixture to a co-rotating twin-screw provided extruder, carrying out extrusion granulation, granulating through a pelleter, and drying until the mass is constant. Compared with polylactic acid-graphene composite materials, the polylactic acid-bacterial cellulose composite material prepared in the invention has the advantages of excellent mechanical performances, high tensile strength and bending strength, substantial reduction of the water absorption rate, and suitableness for processing application.

Description

technical field [0001] The invention relates to the field of biological materials, in particular to a polylactic acid-bacterial cellulose medical composite material and a preparation method thereof. Background technique [0002] With the increasing pressure of fossil fuel resources and plastic post-processing, the research and development of biodegradable polymer materials has become a research hotspot in the field of polymer science. Polylactic acid is a natural renewable resource with good mechanical properties, biodegradability, biocompatibility and environmental friendliness, and it has a wide range of raw materials, making it the best choice for research and development. However, due to the high brittleness and high price of polylactic acid, its application development is limited. Blending polylactic acid with cellulose is a very promising technical approach to develop biodegradable materials. However, due to the hydrophobicity of polylactic acid and the water absorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/02C08L71/08C08K13/02C08K3/04C08K3/16C08K5/098C08K3/34
Inventor 金仲恩全春兰张帆
Owner SUZHOU COSMETIC MATERIALS
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