Lignin porous microspheres based on W/O/W type multiple emulsion solvent volatilization and preparation method and application thereof

A technology of porous microspheres and lignin, applied in the fields of botanical equipment and methods, applications, chemical instruments and methods, etc., can solve the problems of not conforming to the concept of green chemistry, not realizing the maximum utilization of lignin, and low proportion, etc. Achieve the effect of improving solubility, good biocompatibility, and simple operation

Active Publication Date: 2022-06-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the use of highly toxic organic solvents in the reaction process does not conform to the concept of green chemistry
In these methods, lignin is usually combined with other p

Method used

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  • Lignin porous microspheres based on W/O/W type multiple emulsion solvent volatilization and preparation method and application thereof
  • Lignin porous microspheres based on W/O/W type multiple emulsion solvent volatilization and preparation method and application thereof
  • Lignin porous microspheres based on W/O/W type multiple emulsion solvent volatilization and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1

[0046] (1) Preparation of hydrophobic lignin: 10 g of dried wood pulp black liquor of acid-separated lignin powder was dissolved in 100 g of acetone solution containing 2 g of dodecyl vinyl ether, at room temperature N 2 Under the atmosphere, the cobalt source was irradiated continuously until the absorbed dose was 60 kGy, and the radiation dose rate was 5 kGy / h. Finally, the obtained mixed solution is rotary-evaporated and dried to obtain hydrophobically modified lignin powder.

[0047] (2) Preparation of lignin particle dispersion: disperse 2 g of the hydrophobically modified lignin in step (1) in 100 g of water, adjust the pH to 11 with 1 mol / L NaOH solution, filter and remove impurities to obtain a hydrophobically modified lignin solution , and then use 1 mol / L HCl solution to adjust the pH of the system to 3, so that lignin is precipitated to form a lignin particle dispersion.

[0048] (3) Preparation of W / O / W type double emulsion: first, add 2.5g dei...

Example Embodiment

[0050] Example 2

[0051] (1) Preparation of hydrophobic lignin: 10 g of dried bamboo pulp black liquor acid-separated lignin powder was dissolved in 100 g of acetone solution containing 0.5 g of methyl acrylate, and at room temperature N 2 Under the atmosphere, the cobalt source was irradiated continuously until the absorbed dose was 40 kGy, and the radiation dose rate was 2 kGy / h. Finally, the obtained mixed solution is rotary-evaporated and dried to obtain hydrophobically modified lignin powder.

[0052] (2) Preparation of lignin particle dispersion: disperse 5 g of the hydrophobically modified lignin in step (1) in 100 g of water, adjust the pH to 12 with 1 mol / L NaOH solution, filter and remove impurities to obtain a hydrophobically modified lignin solution , and then adjust the pH of the system to 5 with 1 mol / L acetic acid solution to precipitate lignin to form a lignin particle dispersion.

[0053] (3) Preparation of W / O / W type double emulsion: firstly, 2.5g deionize...

Example Embodiment

[0055] Example 3

[0056] (1) Preparation of hydrophobic lignin: Dissolve 10 g of dry enzymatically hydrolyzed lignin powder in 100 g of acetone solution containing 1 g of vinyltrimethoxysilane, and at room temperature N 2 Under the atmosphere, the cobalt source was irradiated continuously until the absorbed dose was 30 kGy, and the radiation dose rate was 0.5 kGy / h. Finally, the obtained mixed solution is rotary-evaporated and dried to obtain hydrophobically modified lignin powder.

[0057] (2) Preparation of lignin particle dispersion: disperse 10 g of the hydrophobically modified lignin in step (1) in 100 g of water, adjust the pH to 10 with 1 mol / L ammonia water, filter and remove impurities to obtain a hydrophobically modified lignin solution, Then use 1mol / L H 2 SO 4 The pH of the solution was adjusted to 3, and the lignin was precipitated to form a lignin particle dispersion.

[0058] (3) Preparation of W / O / W type double emulsion: First, add 2.5g deionized water to ...

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Abstract

The invention discloses a lignin porous microsphere based on W/O/W type multiple emulsion solvent volatilization and a preparation method and application thereof. The method comprises the following steps: firstly, carrying out radiation hydrophobic modification on lignin, dispersing the modified lignin in water, adding alkali to dissolve the lignin, filtering, adding acid to adjust the pH value to separate out the lignin, and taking lignin particle dispersion liquid after separation as a water phase; adding water into the oil phase containing the surfactant, and emulsifying to obtain W/O primary emulsion; adding the W/O primary emulsion into the outer water phase, and stirring and emulsifying at a high speed to obtain W/O/W type multiple emulsion; and drying the emulsion to form the pure lignin porous microspheres. The preparation method is simple, the organic oil phase can be recycled and reused, and the potential of large-scale industrialization is achieved. Meanwhile, according to the method, the balling effect is good, the particle size is controllable, pore channels in the spheres are rich, and the dried microspheres are easy to store and convenient to transport. The sphere is pure lignin, has good biocompatibility, is biodegradable, and has zero pollution to the environment and organisms.

Description

technical field [0001] The invention belongs to the technical field of microsphere preparation, and in particular relates to a lignin porous microsphere based on the volatilization of a W / O / W type double emulsion solvent and a preparation method and application thereof. Background technique [0002] Microspheres refer to spherical or quasi-spherical entities with macromolecular materials as the matrix skeleton, the particle size is between 1-250 μm, and they are mainly divided into solid microspheres, hollow microspheres and porous microspheres according to their structure. Among them, porous microspheres have a larger specific surface area and space capacity because of their rich and interconnected pore structure inside and outside, so they have unique advantages in the application of micro-adsorption materials, drug carriers, and catalytic materials. Commonly used polymer materials mainly include natural polymer materials such as gelatin, chitosan, and sodium alginate, and...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L97/00C08H7/00C02F1/28B01J20/28B01J20/24A01N43/90A01N25/10C02F101/20
CPCC08J9/28C08H6/00A01N43/90A01N25/10B01J20/24B01J20/28054C02F1/286C08J2397/00C02F2101/20
Inventor 庞煜霞李治平邱学青楼宏铭易聪华于杰瑶
Owner SOUTH CHINA UNIV OF TECH
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