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Method for preparing nano cellulose by alkali/toluene method

A technology of nano-cellulose and toluene, which is applied in pulping of cellulose raw materials, pulping with inorganic alkali, fiber raw material treatment, etc., can solve the problems of slow reaction speed, environmental pollution of acid waste liquid, etc., and achieve simple steps and low environmental pollution Small, easily industrialized effects

Active Publication Date: 2013-07-24
NORTHEAST FORESTRY UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nanocellulose by alkali / toluene method in order to solve the problems of slow reaction speed and environmental pollution caused by acid waste liquid in the existing process of preparing nanocellulose
[0006] The present invention directly utilizes paper mill pulp (reed pulp), commercial microcrystalline cellulose and absorbent cotton as fiber raw materials, dissolves through alkali and urea pretreatment, adds toluene and surfactant Tween-80, and then combines reasonable aftertreatment such as centrifugation process, which solves the problem of slow reaction speed in the process of preparing nanocellulose in the prior art, and finally produces quasi-spherical granular nanocellulose

Method used

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  • Method for preparing nano cellulose by alkali/toluene method
  • Method for preparing nano cellulose by alkali/toluene method
  • Method for preparing nano cellulose by alkali/toluene method

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specific Embodiment approach 1

[0011] Specific Embodiment 1: The method for preparing nanocellulose by the alkali / toluene method in this embodiment is as follows: 1. Dissolve the fiber raw material in a mixed solution of sodium hydroxide, urea and water under the condition of minus 8°C to minus 15°C , stirring for 3min to 5min, and then using a centrifuge to centrifuge at a centrifugal speed of 9000r / min for 8min to obtain a clear viscous solution, wherein the mass ratio of the fiber raw material to the mixed solution of sodium hydroxide, urea and water is 1g: 25mL, The mass ratio of sodium hydroxide, urea and water in the mixed solution of sodium hydroxide, urea and water is 7: 12: 81; Two, Tween-80 and toluene are mixed according to the volume ratio of 1: 18~20, and in Stir at room temperature with a magnetic force of 1000r / min for 30min to 35min, add the clear viscous solution obtained in step 1, the volume ratio of the clear viscous solution to toluene is 2:15, stir at room temperature for 3h, and obtain...

specific Embodiment approach 2

[0013] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the fiber raw material in step 1 is reed pulp, absorbent cotton or microcrystalline cellulose. Other steps and parameters are the same as in the first embodiment.

[0014] The reed pulp described in this embodiment is from a paper mill, and the absorbent cotton and microcrystalline cellulose are commercially available absorbent cotton and microcrystalline cellulose.

specific Embodiment approach 3

[0015] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the fiber raw material is dissolved in a mixed solution of sodium hydroxide, urea and water at minus 12°C. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for preparing nano cellulose by an alkali / toluene method, and relates to a preparation method of nano cellulose. The method disclosed by the invention solves the problems of low reaction speed and environmental pollution of acid waste liquid in the existing preparation process of nano cellulose. The preparation method comprises the following steps: dissolving a fiber raw material in a mixed solution of sodium hydroxide, urea and water, stirring and centrifuging to obtain a clear sticky solution; mixing tween-80 with toluene, stirring under the action of magnetic force, and adding the clear sticky solution obtained in the previous step; stirring, and dropwisely adding a hydrochloric acid solution until the pH value is 6-7; adding distilled water and centrifuging; and carrying out rotary evaporation, and concentrating to obtain the nano cellulose. The method disclosed by the invention enables easy implementation of equipment, has simple steps, does not need sulfuric acid or high-pressure filtration through a dialysis membrane, is simple to operate and easy for industrialization, and brings little pollution to environment.

Description

technical field [0001] The invention relates to a preparation method of nanocellulose. Background technique [0002] my country is a Shaolin country, and by 2010 the forest coverage rate can reach 20%. There are fewer over-mature forests available for harvesting, while the productivity of natural forest lands has declined, and the contradiction between timber supply and demand has become increasingly acute. In addition, people overuse non-renewable resources such as natural gas, oil, and minerals, and energy shortage has become a major problem that human society faces urgently. The development and utilization of new resources has become a top priority for all countries in the world. Cellulose is a sustainable natural polymer mainly synthesized by plants through photosynthesis in nature. It is the most abundant natural polymer compound in the world and widely exists in the tunicate of natural plants and urochodates. It is an inexhaustible and inexhaustible renewable resourc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C3/20D21C3/22
Inventor 刘志明谢成王海英卜良霄
Owner NORTHEAST FORESTRY UNIVERSITY
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