Lignin particle based hydrogel and method for preparation of lignin colloidal particles by solvent evaporation process

A technology of lignin and hydrogel, which is applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the problems of not reflecting the one-pot method of spherical lignin nanoparticles, and not disclosing the application of colloidal lignin particles, etc. Achieved to facilitate easy printing and improve structure retention

Active Publication Date: 2021-07-23
AALTO UNIV FOUND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[16] The prior art presented above does not embody a one-pot approach to the preparation of colloidally stabilized spherical lignin nanoparticles from unchemically modified lignin precursors
Moreover, the prior art does not disclose the use of colloidal lignin particles in hydrogel matrices, such as rheology modifiers for hydrogels in additive manufacturing (3D printing) or for stabilization during storage or use. printed construct

Method used

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  • Lignin particle based hydrogel and method for preparation of lignin colloidal particles by solvent evaporation process
  • Lignin particle based hydrogel and method for preparation of lignin colloidal particles by solvent evaporation process
  • Lignin particle based hydrogel and method for preparation of lignin colloidal particles by solvent evaporation process

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Embodiment approach

[0060] In one embodiment, the method comprises the steps of:

[0061] - providing a solution of unmodified lignin in a mixture of a volatile organic solvent for lignin and a non-solvent for lignin; and

[0062] - Evaporation of the volatile organic solvents of the lignin, especially under reduced pressure, to produce an aqueous dispersion of colloidal lignin particles.

[0063] In one embodiment, more non-solvent is added to the solution prior to evaporation.

[0064] In one embodiment, the method comprises the steps of:

[0065] - providing a solution of unmodified lignin in a mixture of a volatile organic solvent for lignin and a non-solvent for lignin; and

[0066] -Adding more non-solvent to produce an aqueous dispersion of colloidal lignin particles.

[0067] In one embodiment, the solvent mixture used to prepare the colloidal lignin particles by diluting the organic solvent with a lignin non-solvent, such as water, corresponds to the solvent mixture used in the embodi...

Embodiment 1

[0104] Example 1. Preparation and Characterization of Colloidal Lignin Particles

[0105] This example describes the preparation of CLP by adding lignin solution to water. BIOPIVA 100, UPM softwood kraft lignin (7.5 g, dry basis) was dissolved in 150 g of acetone-water 3:1 w / w solvent mixture. After stirring for three hours at 22°C, the solution was filtered through a glass microfiber filter (Whatman, GF / F grade) and immersed in vigorously stirred deionized water (450 g) at 22°C. The colloid formed was diluted ~20-fold and analyzed by particle dynamic light scattering.

[0106] figure 1 TEM micrographs of colloidal lignin particles produced by adding lignin solution in acetone-water 3:1 w / w to deionized water are shown. TEM images were acquired in brightfield mode on a FEevaI-FEevaI Tecnai 12 operated at 120kV.

[0107] It is evident that by the described method colloidal lignin particles are obtained with a Z-average particle size of 170±3 nm and a PdI of 0.15±0.02 (N=3)....

Embodiment 2

[0108] Example 2: Effect of pH on particle properties of colloidal lignin particles

[0109] The purpose of this example is to show the effect of pH on the particle size of colloidal lignin particles. A 1 wt% concentration lignin solution in acetone-water 3:1 w / w solvent mixture was adjusted to a predetermined pH value by adding a small amount of aqueous hydrochloric acid, sodium hydroxide or ammonium hydroxide. These lignin solutions were used to prepare colloidal lignin particles by quickly pouring deionized water as a non-solvent into the lignin solutions.

[0110] figure 2 The effect of pH on the particle size of lignin colloids is shown. More specifically, figure 2 CLP formation by direct precipitation is shown. pH vs. Z-average particle size of colloidal lignin particles prepared by adding deionized water (120 g) to 40 g of a 1 wt % lignin solution in acetone-water 3:1 w / w solvent mixture (○ ) and the polydispersity index Impact. Adjustment of pH was performed ...

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Abstract

Method of preparing a dispersion of colloidal lignin particles by providing a solution of lignin in a mixture of an organic solvent for lignin and a non-solvent for lignin having a ratio of non-solvent to solvent; and increasing the ratio of the non-solvent to the solvent to produce an aqueous dispersion of colloidal lignin particles. The dispersions are stable and the colloidal lignin particles are useful for many applications such as rheology modifiers in three-dimensional printing of hydrogels, or in purification systems such as filters, and packed columns, and as flocculants.

Description

[0001] field of invention [0002] The invention belongs to the technical field of preparation and application of nanometer materials. In particular, the invention relates to the production of colloidal particles from lignin, for example by solvent evaporation using volatile aqueous-organic mixtures as solvents for lignin, and the use of said particles in hydrogel formulations for additive manufacturing. Background technique [0003] Increased utilization of renewable resources will be required to reduce dependence on petroleum energy and materials. Lignin is an unexplored phenolic polymer of plant biomass. Its structural heterogeneity and poor compatibility with synthetic (biodegradable or non-biodegradable) polymers have constrained the development of applications of lignin-based materials. [0004] Currently, lignin is separated on a commercial scale from spent pulping liquors by precipitation and membrane filtration techniques. Chemical modification of lignin by various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/00C08J3/075
CPCC08L97/005C08J2397/00C08J3/07C08L1/04C08L5/04C09K23/00C08L2201/54
Inventor 莫妮卡·奥斯特贝格米卡·西波宁莫里·科斯蒂艾宁劳拉·阿克拉斯纪尧姆·里维埃张雪
Owner AALTO UNIV FOUND
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