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Lignin micro/nanospheres, enhanced polylactic acid 3D printing material and preparation method thereof

A 3D printing, lignin technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve problems such as shear thinning, and achieve the effect of improving tensile strength and bending strength, increasing mechanical properties, and high gloss.

Active Publication Date: 2019-09-17
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patent CN106928670A discloses oxidatively modified lignin-based polylactic acid composite materials and their preparation methods and oxidation devices. The composite material is prepared by melt blending, the composite material has excellent mechanical properties, and solves the technical problem of shear thinning existing in the compounding process of the existing lignin / polylactic acid composite material

Method used

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  • Lignin micro/nanospheres, enhanced polylactic acid 3D printing material and preparation method thereof
  • Lignin micro/nanospheres, enhanced polylactic acid 3D printing material and preparation method thereof
  • Lignin micro/nanospheres, enhanced polylactic acid 3D printing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 1 g of polyvinyl alcohol with a molecular weight of 1500 into a beaker filled with 0.5 L of water, and heat it at 80°C until the polyvinyl alcohol is completely dissolved to form a 2 g / L polyvinyl alcohol aqueous solution.

[0034] (2) Take 0.25 g of organic solvent lignin in a 500 mL beaker, add 100 mL of tetrahydrofuran, and emulsify at a high speed of 10000 r / min for 30 s to form a suspension of lignin and organic solvent with a concentration of 2.5 g / L. Add 200 mL of the polyvinyl alcohol aqueous solution prepared in step (1) to the above suspension, and stir for 4 h at a water bath temperature of 30 °C to form an emulsion with a volume ratio of water to organic solvent of 2.

[0035] (3) Take out the emulsion obtained in step (2) in batches, put it into a centrifuge test tube, and perform centrifugation at a speed of 9000 r / min and a centrifugation time of 10 min, remove the filtrate, and then wash with deionized water until the filtrate It is neutral and...

Embodiment 2

[0043] (1) Weigh 2 g of polyvinyl alcohol with a molecular weight of 2000 into a beaker filled with 0.5 L of water, and heat it at 80°C until the polyvinyl alcohol is completely dissolved to form a 4 g / L polyvinyl alcohol aqueous solution.

[0044] (2) Take 0.5 g of cellulase lignin in a 500 mL beaker, add 100 mL of N,N-dimethylformamide, emulsify at a speed of 12000 r / min for 30 s, and form a concentration of 5 g / L lignin and organic solvent suspension. Add 300 mL of the polyvinyl alcohol aqueous solution prepared in step (1) to the above suspension, and stir for 4 h at a water bath temperature of 40 °C to form an emulsion with a volume ratio of water to organic solvent of 3.

[0045] (3) Take out the emulsion obtained in step (2) in batches, put it into a centrifuge test tube, and carry out centrifugation at a speed of 6000 r / min and a centrifugation time of 10 min, remove the filtrate, and then wash with deionized water until the filtrate It is neutral and colorless, and l...

Embodiment 3

[0050] (1) Weigh 3 g of polyvinyl alcohol with a molecular weight of 3000 into a beaker filled with 0.5 L of water, and heat it at 80°C until the polyvinyl alcohol is completely dissolved to form a 6 g / L polyvinyl alcohol aqueous solution.

[0051] (2) Take 0.25 g of sulfuric acid lignin in a 500 mL beaker, add 100 mL of dichloromethane, and emulsify at a high speed of 14000 r / min for 30 s to form a suspension of lignin and organic solvent with a concentration of 2.5 g / L liquid. Add 300 mL of the polyvinyl alcohol aqueous solution prepared in step (1) to the above suspension, and stir for 4 h at a water bath temperature of 50 °C to form an emulsion with a volume ratio of water to organic solvent of 3.

[0052] (3) Take out the emulsion obtained in step (2) in batches, put it into a centrifuge tube, and carry out centrifugation at a speed of 8000 r / min and a centrifugation time of 10 min, remove the filtrate, and then wash with deionized water until the filtrate It is neutral ...

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Abstract

The invention belongs to the field of macromolecule composite materials and 3D printing materials, and in particular relates to lignin micro / nanosphesres and a related enhanced polylactic acid 3D printing material for an FDM (fused deposition modeling) type 3D printing technique. The lignin micro / nanosphesres and the enhanced polylactic acid 3D printing material thereof are prepared from natural lignin, an organic solvent, polyvinyl alcohol and polylactic acid as raw materials through a constant-temperature water bath reaction and blending extrusion. The preparation process comprises mixing, water bath heating, drying, blending extrusion, wire drawing, and the like, the whole preparation process is simple and high in repeatability, the prepared 3D printing material has remarkably improved mechanical properties and good processing performance when being compared with pure polylactic acid, and compared with a common lignin enhanced polylactic acid 3D printing material, the 3D printing material is high in glossiness, not liable to cause end blocking or edge warping in printing, and has high application values in fields such as household articles, decoration, lamps and art and model designing.

Description

technical field [0001] The invention belongs to the field of polymer materials and 3D printing materials, and specifically relates to a lignin micro / nano ball, reinforced polylactic acid 3D printing material and a preparation method thereof. Background technique [0002] Lignin is one of the three major components of the plant skeleton. In nature, lignin is a natural organic macromolecule second only to cellulose. According to statistics, at least about 70 million tons of lignin and its by-products are produced every year. However, the utilization rate of lignin is still very low, and for a long time, lignin has been neglected as a waste, and most of the lignin is directly burned, which not only has a very low utilization rate but also pollutes the environment. In order to realize the high value-added utilization of lignin, chemical or physical modification methods are usually used to modify lignin to improve its utilization rate. The chemical modification methods include ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/04C08L67/04C08L97/00
CPCB01J13/04C08L67/04C08L97/005
Inventor 董先明龙海波蔡奇龙虎良可杨飞文周武艺罗颖
Owner SOUTH CHINA AGRI UNIV
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