Hydrophobic modified nano cellulose preparation method

A nanocellulose and hydrophobic modification technology, which is applied in the field of preparation of hydrophobically modified nanocellulose, can solve the problems of complex process, low efficiency and high energy consumption, and achieve the goal of overcoming easy agglomeration, reducing production cost and expanding the scope of application Effect

Inactive Publication Date: 2017-06-09
胡云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low efficiency, high energy consumption, non-environmental protection, complex process, easy agglomeration and poor dispersion of the prepared nanocellulose in the existing methods for preparing nanocellulose, the present invention aims to provide a hydrophobically modified nanocellulose The preparation method of cellulose, in order to achieve the above object, the present invention adopts following technical scheme:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 20 g of air-dried cotton fibers, grind and pulverize them, and place them in a three-neck glass flask, then add 162.4 g of 10% sodium hydroxide solution to the flask to fully swell the fibers, and process for 24 h; to 30%, then add 1.65 g of acrylamide to the fiber slurry, control the reaction temperature at 80°C, react for 4 h, then wash and filter to obtain carboxyethyl cellulose, and measure its carboxyethyl content to be 1.52 mmol / g ; With isopropanol as the reaction solvent, add 0.64g hexadecane bromide to the above-mentioned carboxyethyl cellulose, increase the temperature from 55°C to 70°C within 30min, and keep the reaction temperature after 45min. 90°C, react under these conditions for 4 hours to generate hydrophobically modified carboxyethyl cellulose; wash and filter, concentrate the hydrophobically modified carboxyethyl cellulose suspension to a concentration of 2%, and process it with a high-pressure homogenizer Homogeneously treated 5 times to finall...

Embodiment 2

[0018] Weigh 20 g of air-dried bleached softwood pulp fibers, grind and pulverize them, put them in a three-neck glass flask, then add 162.4 g of 10% sodium hydroxide solution to the flask to fully swell the fibers, and process for 24 h; extrude Concentrate the slurry to 30%, then add 2.25 g of acrylamide to the fiber slurry, control the reaction temperature at 80°C, react for 4 h, then wash and filter to obtain carboxyethyl cellulose, the carboxyethyl cellulose is measured as 1.87 mmol / g; with isopropanol as the reaction solvent, add 0.64g hexadecane bromide to the above carboxyethyl cellulose, raise the temperature from 55°C to 70°C within 30min, and keep it for 45min. The reaction temperature was increased to 90°C, and reacted for 4 hours under this condition to generate hydrophobically modified carboxyethyl cellulose; the hydrophobically modified carboxyethyl cellulose suspension was concentrated to 2% concentration by washing, and homogenized with high pressure The homoge...

Embodiment 3

[0020] Weigh 20 g of air-dried bleached softwood pulp fibers, grind and pulverize them, put them in a three-neck glass flask, then add 162.4 g of 10% sodium hydroxide solution to the flask to fully swell the fibers, and process for 24 h; extrude Concentrate the slurry to 30%, then add 2.25 g of acrylamide to the fiber slurry, control the reaction temperature at 80°C, react for 4 h, then wash and filter to obtain carboxyethyl cellulose, the carboxyethyl cellulose is measured as 1.87 mmol / g; using isopropanol as the reaction solvent, add 0.82 g of chloroacetyl chloride to the above carboxyethyl cellulose, raise the reaction temperature to 60 °C, and react for 3 h under these conditions to generate hydrophobically modified carboxy Ethyl cellulose; washing and filtering, concentrating the hydrophobically modified carboxyethyl cellulose suspension to a concentration of 2%, and using a high-pressure homogenizer to homogenize it for 5 times to finally obtain hydrophobically modified c...

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Abstract

A method for preparing hydrophobically modified nanocellulose, comprising the following steps: (1) performing alkali swelling treatment on fiber raw materials with excess sodium hydroxide solution, and then adding 5-15% propylene relative to the weight of the dry fiber raw materials Amide, react at a temperature of 60-90°C for 2-6 hours, wash and filter to obtain carboxyethyl cellulose; (2) make the carboxyethyl cellulose in an organic solvent system at a temperature of 55-95°C The reaction time is 2 to 4 hours to generate hydrophobically modified carboxyethyl cellulose; (3) Mechanically treat the hydrophobically modified carboxyethyl cellulose with a high-pressure homogenizer, Finally, hydrophobically modified carboxyethyl nanocellulose was obtained. The hydrophobically modified nanocellulose prepared by the method of the present invention has good dispersibility, high transparency, good compatibility and high thermal stability, and can be applied to oil drilling, building material mortar, textile printing and dyeing, electronic slurry, coating, ceramics, papermaking and Daily chemicals and other industries.

Description

technical field [0001] The invention relates to a method for preparing hydrophobically modified nano-cellulose, which belongs to the technical field of nano-material preparation. Background technique [0002] The uniqueness of nano-cellulose in nano-aggregated structure and physical properties makes it have broad application prospects in industries such as oil drilling, building material mortar, textile printing and dyeing, electronic paste, paint, ceramics, papermaking and daily chemicals. [0003] At present, the methods for preparing nanocellulose include chemical method (acid hydrolysis method), homogenization method, biological method, (chemical / biological) pretreatment combined with mechanical treatment method, etc. Using the acid hydrolysis method, although the obtained nanocellulose has good dispersibility and stability, the reaction system will use a large amount of acid and consume a large amount of water, resulting in low yield, high production cost, complicated p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12C08B11/20
CPCC08B11/12C08B11/20
Inventor 胡云
Owner 胡云
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