A kind of all bio-based toughened polylactic acid composite material and preparation method thereof

A technology of composite materials and tough polylactic acid, applied in the field of composite materials, can solve the problems of performance degradation of composite materials, and achieve the effects of improving thermal/mechanical properties, enhancing reactivity, and reducing material performance instability

Active Publication Date: 2020-09-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because pure lignin tends to agglomerate in the polymer matrix, the performance of the composite material drops sharply

Method used

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  • A kind of all bio-based toughened polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of full bio-based toughened polylactic acid composite material, comprises the steps:

[0028] (1) Maleic anhydride modified lignin

[0029] Weigh 10g of lignin and add it to 50mL of deionized water, stir to dissolve, precipitate it with 2M hydrochloric acid solution, centrifuge to obtain lignin solid, then wash the precipitate with deionized water repeatedly for 3 to 5 times, and finally place the obtained lignin solid at 40 Dry in a vacuum oven for 12 hours at °C, store for later use, and prepare pretreated lignin.

[0030] Weigh 8g of pretreated lignin and add it to 25mL of anhydrous DMF, stir evenly at 80°C, then add 10g of maleic anhydride and 10mg of 4-dimethylaminopyridine (DMAP) respectively, and react for 12h to obtain maleic anhydride-modified lignin. Prime (lignin-Ma). Its NMR spectrum is as figure 1 as shown, figure 1 The range of δ=1 to 3 in the shown H NMR spectrum is the chemical shift of the alkyl protons in the lignin str...

Embodiment 2

[0035] Example 2 (PLA / 2LM / 20ESO)

[0036] A kind of preparation method of full bio-based toughened polylactic acid composite material, comprises the steps:

[0037] (1) method is with step (1) in embodiment 1;

[0038] (2) Polylactic acid / maleic anhydride modified lignin / epoxy soybean oil composite material

[0039](a) The total mass of the fixed polylactic acid composite material is 50g, and 1g of maleic anhydride modified lignin, 10g of epoxy soybean oil and 39g of polylactic acid are weighed respectively with a mass fraction of 2% and 20%;

[0040] (b) 39g of polylactic acid and 1g of maleic anhydride modified lignin were vacuum-dried at 40°C for 12h, and then the polylactic acid and modified lignin were added to a Haake torque rheometer at 180°C Premix for 2 minutes, then add 10g epoxy soybean oil, and mix evenly for 10 minutes;

[0041] (c) The homogeneously mixed composite material was melted and hot-pressed at 190°C to obtain a polylactic acid / maleic anhydride modifi...

Embodiment 3

[0042] Example 3 (PLA / 5LM / 10ESO)

[0043] A kind of preparation method of full bio-based toughened polylactic acid composite material, comprises the steps:

[0044] (1) step is with step (1) in embodiment 1;

[0045] (2) Polylactic acid / maleic anhydride modified lignin / epoxy soybean oil composite material

[0046] (a) The total mass of the fixed polylactic acid composite material is 50g, and 2.5g maleic anhydride modified lignin, 5g epoxy soybean oil and 42.5g polylactic acid are weighed respectively with a mass fraction of 5% and 10%;

[0047] (b) Dry the weighed 42.5g polylactic acid and 2.5g maleic anhydride modified lignin in vacuum at 40°C for 12h, then add the polylactic acid and modified lignin to the Haake torque flow at 180°C Pre-mix in the variable instrument for 2 minutes, then add 5g epoxy soybean oil, and mix evenly for 10 minutes;

[0048] (c) The homogeneously mixed composite material was melted and hot-pressed at 190°C to obtain a polylactic acid / maleic anhy...

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Abstract

The invention discloses a full-bio-based toughened polylactic acid composite, comprising, by weight, 75-90% of polylactic acid, 2-5% of maleic anhydride-modified lignin, and 5-20% of epoxidized soybean oil. The maleic anhydride-modified lignin and the epoxidized soybean oil are used to modify polylactic acid material by means of reactive blending; therefore, high strength of the composite is retained at the premise of improving its toughness. The preparation method is simple; the composite has excellent regenerability and biodegradability.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing composite materials by reacting modified lignin and epoxidized soybean oil with polylactic acid as raw materials. Background technique [0002] Due to the continuous reduction of global oil resources and the increasing destruction of the earth's environment, the development of a renewable and degradable material that is in line with the green and sustainable economic development path has aroused the vigorous research of many scientific researchers. Polylactic acid can be obtained by chemical synthesis by fermenting and extracting lactic acid from corn. Due to the wide source of polylactic acid, and its natural renewable, non-toxic, good biocompatibility and biodegradable properties, it has a wide range of applications in the fields of agriculture, biomedicine and packaging, so polylactic acid is considered to be the most Application prospects o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/00C08L91/00C08H7/00
CPCC08H6/00C08L67/04C08L2201/06C08L2205/03C08L97/005C08L91/00
Inventor 陈明清
Owner JIANGNAN UNIV
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