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Lignin/microcrystalline cellulose composite, reinforced polylactic acid 3D printing material and preparation method thereof

A microcrystalline cellulose, 3D printing technology, applied in the direction of additive processing, etc., can solve the problems of difficult utilization of lignin and poor cellulose compatibility, and achieve the improvement of poor compatibility, good compatibility and wide application range. Effect

Active Publication Date: 2019-12-20
SOUTH CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings and deficiencies in the prior art, such as poor compatibility between cellulose and polymer materials, and difficult utilization of lignin, one of the purposes of the present invention is to provide a lignin / microcrystalline cellulose composite, which can be obtained through a simple and safe process. treatment, realizing the production concept of environmental protection and green

Method used

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  • Lignin/microcrystalline cellulose composite, reinforced polylactic acid 3D printing material and preparation method thereof
  • Lignin/microcrystalline cellulose composite, reinforced polylactic acid 3D printing material and preparation method thereof
  • Lignin/microcrystalline cellulose composite, reinforced polylactic acid 3D printing material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] A preparation method of reinforced polylactic acid 3D printing material, comprising the following steps:

[0041] (1) Pulverize the ordinary cellulose made from cotton fiber and pass it through a 100-mesh sieve to obtain cellulose powder with uniform particle size; then use 30% sulfuric acid solution to acidify the cellulose for 8 h, filter to remove the amorphous cellulose, Dry in an oven at 80°C for 12 hours to obtain microcrystalline cellulose, whose infrared spectrum and scanning electron microscope photos are shown in figure 1 a and figure 2 ;

[0042] (2) Mix the microcrystalline cellulose obtained in step (1) with ethanol at a mass ratio of 1:2. The mixture was placed in a water bath at 80°C for 0.5 h to a constant temperature, and then silane coupling agent KH550 and organic solvent lignin (infrared The spectra and scanning electron microscope pictures are shown in figure 1 b and image 3 ), stirred and reacted for 4 h at a constant temperature of 80 °C un...

Embodiment 2

[0050] A preparation method of reinforced polylactic acid 3D printing material, comprising the following steps:

[0051] (1) Pulverize the ordinary cellulose made from flax fiber and pass through a 150-mesh sieve to obtain cellulose powder with uniform particle size; then acidify the cellulose with 30% hydrochloric acid solution for 8 h, and filter to remove the amorphous cellulose, drying in an oven at 80°C for 12 hours to obtain microcrystalline cellulose;

[0052] (2) Mix the microcrystalline cellulose obtained in step (1) with ethanol at a mass ratio of 1:3. Place this mixture in a water bath at 80°C for 0.5 h to a constant temperature, then add silane coupling agent KH560 and sulfuric acid lignin at a ratio of 1:5 and 1:5 to microcrystalline cellulose, respectively, at 80°C Stir the reaction at a constant temperature of ℃ and under sealed conditions for 5 h;

[0053] (3) Filter the viscous mixture obtained in step (2), wash it with ethanol until the washing liquid is tr...

Embodiment 3

[0057] A preparation method of reinforced polylactic acid 3D printing material, comprising the following steps:

[0058] (1) Pulverize the ordinary cellulose made from jute fiber and pass it through a 100-mesh sieve to obtain cellulose powder with uniform particle size; then use 30% phosphoric acid solution to acidify the cellulose for 10 h, filter to remove the amorphous cellulose, drying in an oven at 80°C for 12 hours to obtain microcrystalline cellulose;

[0059] (2) Mix the microcrystalline cellulose obtained in step (1) with ethanol at a mass ratio of 1:2. Place this mixture in a water bath at 80°C for 0.5 h to a constant temperature, then add silane coupling agent KH570 and alkali lignin at a ratio of 1:5 and 1:3 to microcrystalline cellulose, respectively, at 80°C The reaction was stirred at a constant temperature of ℃ and sealed for 6 h.

[0060] (3) Filter the viscous mixture obtained in step (2), wash it with ethanol until the washing liquid is transparent and col...

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Abstract

In order to overcome the defects and shortcomings of poor compatibility between cellulose and a polymer matrix, frequent hole blocking in printing, difficulty in printing of lignin / polymer 3D printingmaterial and the like, common cellulose is subjected to acidolysis by using an inorganic acid solution; then the cellulose is modified by a silane coupling agent and lignin in an alcohol solution, toobtain the lignin / microcrystalline cellulose compound. The compound serving as a reinforcing material and PLA serving as a base material are blended with an inorganic nano material, a toughening agent, a plasticizer and the like, and the reinforced polylactic acid 3D printing material with good mechanical property and 3D printing property is prepared by melt extrusion blending and wiredrawing moulding. The mechanical property of the 3D printing material provided by the invention is better than that of common polylactic acid printing materials; according to a test by an FDM type 3D printer, the 3D printing material is completely applicable to the FDM rapid prototyping technology, and the printed product has high glossiness and wood-texture appearance and can be applied to the printing of furniture, toys, artwork, model design and the like.

Description

technical field [0001] The invention belongs to the field of polymer composite materials and 3D printing materials, and specifically relates to a lignin / microcrystalline cellulose composite, a reinforced polylactic acid 3D printing material and a preparation method thereof. Background technique [0002] Cellulose is the oldest and most abundant natural polymer in nature. It is the polysaccharide with the widest distribution and the largest content. It accounts for more than 50% of the carbon content in the plant kingdom. It is inexhaustible and the most precious to human beings. A natural renewable resource, it is a linear natural polymer composed of β-D-glucopyranose groups connected by (1, 4)-β-glycosidic bonds. Most of the cellulose in plants exists in the form of fibers. Lignin is a biopolymer with a three-dimensional network structure formed by the interconnection of three phenylpropane units through ether bonds and carbon-carbon bonds, which widely exists in plants. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/00C08L1/04C08L53/02C08K5/544C08K3/36B33Y70/00
CPCB33Y70/00C08K2201/011C08L67/04C08L2205/035C08L97/005C08L1/04C08L53/025C08K5/544C08K3/36
Inventor 董先明龙海波周武艺肖嘉林莫德培向页澄罗颖
Owner SOUTH CHINA AGRI UNIV
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