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Graphene/polylactic acid composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of graphene/polylactic acid composite material and its preparation, can solve the problems of insufficient notched impact strength, unobvious impact toughness, poor heat resistance of composite materials, etc., and achieve easy mass production , good electrical properties, good heat resistance

Active Publication Date: 2011-08-31
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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Problems solved by technology

However, the brittleness of polylactic acid is relatively large, and the notched impact strength is less than 3kJ / m2; its heat resistance is also poor, and the heat distortion temperature is only about 60°C. Application in Engineering Structural Materials
For example, NagasawaN. and MitomoH. greatly improved the heat resistance of polylactic acid (NagasawaN., KanedaA., KanazawaS., YagiT., MitomoH., YoshiiF., TamadaM.NuclearInstruments&MethodsinPhysicsResearch2005, B236: 611; MitomoH., KanedaA., QuynhT.M., NagasawaN., YoshiiF.Polymer2005, 46: 4695), but this method can only improve the heat resistance of polylactic acid, and the improvement of its impact toughness is not obvious
As another example, NatureWorks, the world's largest polylactic acid manufacturer, blended acrylonitrile-butadiene-styrene with a brand name of BlendexTM338 with polylactic acid, and the notched impact strength of the composite obtained was It can reach more than 50kJ / m2, but the heat resistance of the composite material is still poor, and its strength and rigidity have a certain degree of loss

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  • Graphene/polylactic acid composite material and preparation method thereof
  • Graphene/polylactic acid composite material and preparation method thereof
  • Graphene/polylactic acid composite material and preparation method thereof

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preparation example Construction

[0029] The present invention also provides a kind of preparation method of graphene / polylactic acid composite material, comprises the following steps:

[0030] a) dispersing graphene oxide in water to obtain a graphene oxide dispersion;

[0031] b) under the condition of stirring, adding the polylactic acid solution into the graphene oxide dispersion, leaving the uniformly stirred mixed solution to stand for layering, and obtaining the masterbatch after filtering;

[0032] c) blending the masterbatch with polylactic acid to obtain a graphene / polylactic acid composite material.

[0033] Similar to graphene, graphene oxide is a material composed of carbon six-membered rings with a two-dimensional monoatomic layer planar structure, and is prone to agglomeration. In the present invention, firstly, graphene oxide is dispersed in water to prepare a graphene oxide dispersion liquid. In order to disperse the graphene oxide uniformly, the present invention preferably adopts an ultras...

Embodiment 1

[0054] Ultrasonic disperse graphene oxide in deionized water to prepare a 0.3 mg / mL graphene oxide colloidal dispersion; dissolve polylactic acid in chloroform under heating and stirring to prepare a 0.1 g / mL polylactic acid solution; Under the conditions of 60°C and vigorous stirring, slowly add 1000mL polylactic acid solution into 1000mL graphene oxide colloidal dispersion liquid, stir at constant temperature 60°C for 5h, let the obtained mixture stand for layers, filter out the lower precipitate, and dry , get the masterbatch;

[0055] 30g of masterbatch and 30g of polylactic acid were added to an internal mixer, and melt-blended at 170°C to obtain a graphene / polylactic acid composite material. In the graphene / polylactic acid composite material, graphene accounts for about 0.15% by mass of polylactic acid;

[0056] The performance test of the graphene / polylactic acid composite material is carried out, and the results are shown in Table 1. Table 1 is the performance paramet...

Embodiment 2

[0058] Graphene oxide was ultrasonically dispersed in deionized water to prepare a 2 mg / mL graphene oxide colloidal dispersion; polylactic acid was dissolved in chloroform under heating and stirring to prepare a 0.1 g / mL polylactic acid solution; Under the conditions of 60°C and vigorous stirring, slowly add 1000mL of polylactic acid solution to 1000mL of graphene oxide colloidal dispersion liquid, stir at a constant temperature of 60°C for 5h, let the obtained mixture stand for layers, filter out the lower layer of precipitate, after drying, get the masterbatch;

[0059] 30g of masterbatch and 30g of polylactic acid were added to an internal mixer, and melt-blended at 170°C to obtain a graphene / polylactic acid composite material. In the graphene / polylactic acid composite material, the mass percentage of graphene in polylactic acid is about 0.99%;

[0060] The performance test of the graphene / polylactic acid composite material is carried out, and the results are shown in Tabl...

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Abstract

The invention provides a graphene / polylactic acid composite material, comprising the polylactic acid and graphene oxide, wherein the graphene oxide, by mass, accounts for 0.1% to 5% of the polylactic acid. The invention also provides a preparation method of the graphene / polylactic acid composite material,comprising the steps of: a) dispersing the graphene oxide in water for acquiring graphene oxide dispersion liquid; b) adding polylactic acid solution to the graphene oxide dispersion liquid under stirring condition, letting the uniformly stirred mixed solution stand for layering and filteringfor obtaining master batch; and c) blending the master batch with the polylactic acid for obtaining the graphene / polylactic acid composite material. Experiments show that the graphene / polylactic acidcomposite material provided in the invention has a tensile strength up to 79 MPa, a tensile elastic modulus up to 3100 MPa, a notch impact strength up to 12 KJ / m<2> and a heat deflection temperature up to 95 DEG C.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a graphene / polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid is a biodegradable polymer obtained by condensation of lactic acid or ring-opening polymerization of lactide. In addition to the advantages of wide source of raw materials and renewable, non-polluting production process, polylactic acid has good biocompatibility, Gloss and transparency, but also have certain bacteria resistance, flame retardancy and UV resistance, widely used in packaging materials, medical materials, fibers, nonwovens, etc. in clothing, papermaking, construction, biomedicine and other fields. However, polylactic acid is relatively brittle, and its notched impact strength is less than 3kJ / m 2 ; Its heat resistance is also poor, and the heat distortion temperature is only about 60°C. These two shortcomings l...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/02C08K3/04C08J3/22
Inventor 邓鹏飏尹园郑春柏
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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