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Method for preparing graded nano-crystalline cellulose from ramie raw material

A technology of nanocellulose and ramie fiber, applied in fiber raw material processing, textiles and papermaking, etc., can solve problems such as limiting the application and development of multi-morphic crystal nanocellulose composites, inability to reuse resources, and intensifying the impact of the greenhouse effect , to achieve the effect of easy implementation, high mechanical performance and wide application value

Active Publication Date: 2014-05-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, ordinary fiber waste in daily life is generally disposed of in the form of household garbage or incineration, which cannot achieve resource reuse, and also exacerbates the impact of the greenhouse effect to a certain extent
[0005] At present, most of the methods for preparing nanocellulose are cumbersome and costly, and the product morphology is single and difficult to control, which limits the composite application and development of polymorphic crystalline nanocellulose.

Method used

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  • Method for preparing graded nano-crystalline cellulose from ramie raw material
  • Method for preparing graded nano-crystalline cellulose from ramie raw material

Examples

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Effect test

Embodiment 1

[0027] Embodiment one: Specific steps are as follows:

[0028] (1) Purification and screening: put 5 g of ramie waste into a beaker, add 300 g of NaOH aqueous solution with a mass percentage concentration of 3 wt%, stir at room temperature for 120 min, filter the fiber waste, wash and drain; (2) mechanical crushing: put The obtained fiber waste was processed with a high-speed pulverizer for 10 s to obtain a fiber powder with uniform particles. (3) Alkaline cooking: Add 300 g of NaOH aqueous solution with a mass percentage concentration of 2 wt% to the obtained powder, cook in an oil bath at a temperature of 105 °C for 2 h, filter the filter residue, wash and dry it to neutral; ( 4) Removal of low-grade fibers: Add 200 g of delignification agent (Na 3 PO 4 12H 2 O / Na 2 SiO 3 9H 2 O / NaOH / water mass percentage is 0.8 / 0.8 / 2 / 96.4), at 100°C, react for 120 min to remove lignin, filter the filter residue, wash and dry; (5) bleaching and decomposition treatment: after the obta...

Embodiment 2

[0030] Embodiment two: Specific steps are as follows:

[0031](1) Purification and screening: Put 5 g of ramie waste into a beaker, add 400 g of NaOH aqueous solution with a mass percentage concentration of 4 wt%, stir at room temperature for 90 min, filter the fiber waste, wash and drain; (2) Mechanical crushing: put The obtained fiber waste was treated with a high-speed pulverizer for 15 s to obtain a fiber powder with uniform particles. (3) Lye cooking: Add 300 g of NaOH aqueous solution with a mass percentage concentration of 3 wt% to the obtained powder, cook in an oil bath at a temperature of 110 °C for 1.5 h, filter the filter residue, wash and dry it to neutral; ( 4) Removal of low-grade fibers: Add 200 g of delignification agent (Na 3 PO 4 12H 2 O / Na 2 SiO 3 9H 2 O / NaOH / water mass percentage is 0.8 / 0.8 / 2 / 96.4), at 100°C, react for 120 min to remove lignin, filter the filter residue, wash and dry; (5) bleaching and decomposition treatment: after the obtained F...

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Abstract

The invention relates to a method for preparing graded nano-crystalline cellulose from a ramie raw material. In the method, waste ramie is used as the raw material. The method comprises the following steps: carrying out purification screening, mechanical crushing, cooking with alkali liquor, low-grad fiber removing, bleaching, decomposition, ultrasonic crushing / ultrasonic dispersion, and centrifugal grading; the waste ramie is subjected to component separation and cellulose fining transforming to obtain a cellulose alcohol dispersion solution or cellulose alcohol colloidal solution with the certain concentration; the dispersion solution is subjected to centrifugal grading, so as to obtain nano-crystalline cellulose geodes with the uniform grain sizes and nano-crystalline cellulose fiber with the high draw ratio. The nano-crystalline cellulose with the high draw ratio after the grading has the characteristics of being good in mechanical property, biodegradable, easy to compound and the like. The method is simple, and easy to implement, the energy consumption is low, and the production cost is low; the graded nano-crystalline cellulose has the potential application value when being functionally compounded in the fields of optics, electricity, magnetic, biology, semiconductor devices and the like.

Description

technical field [0001] The invention relates to a method for preparing nanocellulose, in particular to a method for preparing nanocellulose by using ordinary fiber raw materials. Background technique [0002] In recent years, energy has had a huge impact on the world economy and is growing rapidly, and the development model of high energy consumption and high pollution has increasingly become the object of human concern. In order to solve this problem, almost all scientific research institutions have increased their efforts in the development and exploration of new energy sources, so that they can better protect the environment while meeting the premise of my country's economic development. [0003] Cellulose is one of the most abundant natural polymers in nature, the main chemical component of plant fiber raw materials, and the most important and basic chemical component used in pulp and paper. However, the utilization of this most extensive natural raw material still has ...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 冯欣孟祥浩施利毅赵经鹏苗苗曹绍梅王钢领
Owner SHANGHAI UNIV
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