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 substr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

[0014] A preparation method of nano-cellulose grafted epoxy group includes the following steps: preparing 80 parts of sulfuric acid solution with a mass fraction of 64%, adding 15 parts of microcrystalline cellulose, reacting with ultrasonic stirring at 42°C for 55 min, adding 190 parts to remove Ionized water was used to terminate the reaction, repeated centrifugation and washing until the pH value was neutral, and dialyzed to a constant conductivity to obtain NCC slurry, freeze-dried and dispersed at -75°C to obtain NCC; disperse 10 parts of NCC in 65 parts of DMAc, In a nitrogen atmosphere, after heating to 45℃, add 16 parts of CDI, stir and react for 10 hours, then add 15 parts of ECH to the reaction system, continue the reaction for 12 hours, repeat centrifugal washing with absolute ethanol, freeze-dry the product, and disperse. Obtained; All raw materials are parts by weight.

Example Embodiment

[0015] Example 2

[0016] A preparation method of nano-cellulose grafted epoxy group includes the following steps: preparing 75 parts of sulfuric acid solution with a mass fraction of 64%, adding 10 parts of microcrystalline cellulose, ultrasonically stirring at 40°C for 50 min, adding 180 parts to remove Ionized water was used to terminate the reaction, and repeated centrifugation and washing until the pH value was neutral, dialyzed until the conductivity was constant to obtain NCC slurry, freeze-dried and dispersed at -75°C to obtain NCC; disperse 5 parts of NCC in 60 parts of DMAc, In a nitrogen atmosphere, after heating to 44℃, add 14 parts of CDI, stir and react for 9h, then add 10 parts of ECH to the reaction system, continue the reaction for 11h, repeat centrifugal washing with absolute ethanol, freeze-dry the product, and disperse. Obtained; All raw materials are parts by weight.

Example Embodiment

[0017] Example 3

[0018] A preparation method of nano-cellulose grafted epoxy group, including the following steps: 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 min, adding 200 parts to remove Ionized water was used to terminate the reaction and repeated centrifugation and washing until the pH value was neutral. After dialyzing until the conductivity became constant, NCC slurry was obtained, which was freeze-dried and dispersed at -75°C to obtain NCC; 15 parts of NCC were dispersed in 70 parts of DMAc, In a nitrogen atmosphere, after heating to 46°C, add 18 parts of CDI, stir for 11h, and then add 20 parts of ECH to the reaction system, continue the reaction for 13h, then repeat centrifugal washing 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. I...

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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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