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A kind of method of aminosilane modification nano-cellulose airgel

A technology of nanocellulose and aminosilane, which is applied in the production of bulk chemicals, etc., can solve the problems of difficult control of distribution, low graft density, and uneven thickness of "coating", so as to eliminate solvent recovery and simplify the process , Eliminate the effect of self-aggregation

Inactive Publication Date: 2019-01-29
NANJING FORESTRY UNIV
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Problems solved by technology

[0005] At present, the amino group functional modification of nanocellulose airgel is mainly carried out in the liquid phase (including aqueous phase and organic phase). During the functional modification, the distribution of aminosilane molecules on the surface of nanocellulose is difficult to control. After the denaturation, the thickness inhomogeneity of the "coating" of aminosilane molecules on the surface of nanocellulose is serious; at the same time, the self-polymerization phenomenon between aminosilanes is serious, and self-polymerization will lead to partial pore closure in nanocellulose aerogels Or blockage, reducing the porosity and specific surface area of ​​the original airgel, and the graft density is low, generally only 3-6mmolN / g
In addition, during liquid phase modification, there are complex solvent recovery and separation processes. Therefore, it is necessary to develop a new process method to overcome the above problems encountered in the liquid phase modification process

Method used

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Embodiment

[0039](1) Weigh 1.5g of nanocellulose, disperse it into 50g of deionized water, and ultrasonicate for 3min under the condition of power of 300W. Then an automatic shaper with an outlet diameter of 3mm extrudes the nanocellulose colloid into a spherical shape, puts it in a 0.2M CaCl2 solution, and has a solid-to-liquid ratio of 5 (V / V), and stands at room temperature for 10 hours; removes the CaCl2 solution by filtration, A shaped nanocellulose hydrogel is obtained. Solvent replacement was carried out on the formed nanocellulose hydrogels with 50, 80 and 100% tert-butanol solutions respectively, and the replacement time was 3, 5 and 6 hours respectively, so that the formed nanocellulose hydrogels became Alcohol gel; under the conditions of temperature 45 °C and pressure 15 MPa, conduct supercritical carbon dioxide extraction on nano-cellulose alcohol gel for 2 h to remove residual tert-butanol in the gel to obtain shaped nanofibers Plain airgel. Weigh 3g of nano-cellulose air...

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Abstract

The invention relates to a method for modifying nano-cellulose airgel with aminosilane, comprising: 1) making the nano-cellulose suspension into a translucent colloid; 2) extruding the nano-cellulose colloid into a spherical or short rod-shaped hydrogel 3) Make the formed nanocellulose hydrogel into alcohol gel; 4) Prepare nanocellulose airgel; 5) Adsorb gaseous organic amine on the surface of nanocellulose airgel; 6) Vacuum recovery The remaining organic amine catalyst; 7) chemical reaction between gaseous aminosilane and nanocellulose airgel; 8) vacuum recovery of unreacted aminosilane; 9) preparation of the corresponding aminosilanized nanocellulose airgel. Advantages: 1) Eliminate the solvent recovery and separation process encountered in the liquid-phase modification process, simplifying the amination modification process; 2) Maintain the original microscopic three-dimensional network structure of nano-cellulose airgel, improve the modification interface Branch density and uniformity; 3) The process is simple, high efficiency and low cost.

Description

technical field [0001] The invention relates to a method for modifying nano-cellulose airgel with aminosilane, and belongs to the technical field of wood fiber composite materials. Background technique [0002] Nanocellulose is a cellulose-like substance with a one-dimensional or multi-dimensional dimension at the nanometer level (1-100nm), and is a natural polymer. It has the characteristics of cellulose renewability, good biocompatibility, and biodegradability. At the same time, it also has the characteristics of large specific surface area, superior mechanical properties and optical properties. Airgel is a material with a high permeability three-dimensional network structure, which has the characteristics of extremely high porosity, high specific surface area, extremely low density, and low thermal conductivity. At present, aerogels have potential applications in biomedical carriers, photoelectric sensors, catalytic technology, adsorption technology, and energy storage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/09C08J9/28C08J7/12
CPCC08J3/075C08J3/095C08J7/12C08J9/28C08J2301/02Y02P20/54
Inventor 江华张洋吴煜王晓宇
Owner NANJING FORESTRY UNIV
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