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Preparation method of nano-cellulose grafted epoxy group

A technology of nanocellulose and epoxy groups, which is applied in the field of preparation of nanocellulose grafted epoxy groups, can solve the problems of large specific surface area, easy intertwining of fibers, self-agglomeration, etc., and achieve reduced agglomeration, easy operation, Effect of Dispersion Improvement

Inactive Publication Date: 2020-06-02
启东润博园区管理服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanocellulose also has deficiencies: first, the surface of nanocellulose contains a large number of hydroxyl groups, which endow nanocellulose with superhydrophilicity and cannot be well dissolved in weak polar solvents and hydrophobic substrates; secondly, its ratio The surface area is large and has high thermodynamic potential energy, which makes the fibers easily entangled and self-agglomerated; thirdly, nanocellulose still lacks various target properties of polymer compounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for preparing nano-cellulose grafted epoxy groups, comprising the following steps: preparing 80 parts of sulfuric acid solution with a mass fraction of 64%, adding 15 parts of microcrystalline cellulose, ultrasonically stirring at 42°C for 55 minutes, adding 190 parts of Terminate the reaction with ionized water, and repeatedly centrifuge and wash until the pH value is neutral, and dialyze until the conductivity is constant to obtain NCC slurry, freeze-dry and disperse at -75°C to obtain NCC; disperse 10 parts of NCC in 65 parts of DMAc, Under nitrogen atmosphere, after heating to 45°C, add 16 parts of CDI, stir and react for 10 hours, then add 15 parts of ECH to the reaction system, continue to react for 12 hours, then use absolute ethanol to repeatedly centrifuge and wash, freeze-dry the product, and disperse Obtained; All raw materials are parts by weight.

Embodiment 2

[0016] A method for preparing nano-cellulose grafted epoxy groups, comprising the following steps: preparing 75 parts of sulfuric acid solution with a mass fraction of 64%, adding 10 parts of microcrystalline cellulose, and reacting with ultrasonic stirring at 40°C for 50 minutes, adding 180 parts of Terminate the reaction with ionized water, and repeatedly centrifuge and wash until the pH value is neutral, and dialyze until the conductivity is constant to obtain NCC slurry, freeze-dry and disperse at -75°C to obtain NCC; disperse 5 parts of NCC in 60 parts of DMAc, Under nitrogen atmosphere, after heating to 44°C, add 14 parts of CDI, stir and react for 9 hours, then add 10 parts of ECH to the reaction system, continue to react for 11 hours, then use absolute ethanol to repeatedly centrifuge and wash, freeze-dry the product, and disperse Obtained; All raw materials are parts by weight.

Embodiment 3

[0018] A method for preparing nano-cellulose grafted epoxy groups, comprising the steps of: preparing 85 parts of sulfuric acid solution with a mass fraction of 64%, adding 20 parts of microcrystalline cellulose, ultrasonically stirring at 44°C for 60 minutes, adding 200 parts of Terminate the reaction with ionized water, and repeatedly centrifuge and wash until the pH value is neutral, and dialyze until the conductivity is constant to obtain NCC slurry, freeze-dry and disperse at -75°C to obtain NCC; disperse 15 parts of NCC in 70 parts of DMAc, Under nitrogen atmosphere, after heating to 46°C, add 18 parts of CDI, stir and react for 11 hours, then add 20 parts of ECH to the reaction system, continue to react for 13 hours, then repeatedly centrifuge and wash with absolute ethanol, freeze-dry the product, and disperse Obtained; All raw materials are parts by weight.

[0019] The method is simple, fast, and easy to operate. Nanocellulose grafted with epoxy groups is successfull...

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PUM

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Abstract

The invention discloses a preparation method of a nanocellulose grafted epoxy group. The preparation method comprises the following steps: preparing a sulfuric acid solution, adding microcrystalline cellulose, carrying out an ultrasonic stirring reaction at 40-44 DEG C for 50-60 minutes, adding deionized water to terminate the reaction, carrying out centrifugal washing until the pH value is neutral, dialyzing until the conductivity is constant to obtain NCC slurry, carrying out freeze drying at -75 DEG C, and dispersing to obtain NCC; and dispersing NCC in DMAc, heating to 44-46 DEG C in a nitrogen atmosphere, adding CDI, carrying out a stirring reaction for 9-11 hours, adding ECH into the reaction system, continuously reacting for 11-13 hours, repeatedly centrifugally washing with absolute ethyl alcohol, freeze-drying the product, and dispersing to obtain the product. The method is simple, convenient and easy to operate, the epoxy group grafted nanocellulose is successfully and efficiently prepared, the dispersity of the epoxy group grafted nanocellulose in an organic solvent is greatly improved, and the hydroxyl on the surface of the nanocellulose is reduced after the epoxy groupis grafted so as to effectively reduce agglomeration.

Description

technical field [0001] The invention relates to a preparation method of nano cellulose grafted epoxy group. Background technique [0002] Nanocellulose has many advantages, the most prominent of which is that nanocellulose is lightweight and high-strength. Its quality is one-fifth of that of steel, but its strength is more than five times that of steel. In addition, nanocellulose has good biocompatibility and is a kind of Natural, biodegradable green polymer materials. At present, using nanocellulose as a reinforcement to prepare composite materials, shape-stable materials, and biodegradable films is the focus of research on nanocellulose. Therefore, the research and application of nanocellulose is of great significance to the sustainable development strategy. Nanocellulose also has deficiencies: first, the surface of nanocellulose contains a large number of hydroxyl groups, which endow nanocellulose with superhydrophilicity and cannot be well dissolved in weak polar solve...

Claims

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Application Information

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IPC IPC(8): C08B15/00
CPCC08B15/00
Inventor 不公告发明人
Owner 启东润博园区管理服务有限公司
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