Method for preparing nano celluloses through high-pressure homogenizing and low-temperature cooling

A nanocellulose, high-pressure crushing technology, applied in the direction of raw material separation, can solve the problems of affecting stability, material agglomeration, and high material temperature, and achieve the effect of improving dimensional stability and overcoming flocculation.
CN102220718AInactive Publication Date: 2011-10-19NANJING FORESTRY UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING FORESTRY UNIV
Publication Date
2011-10-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing nano celluloses through high-pressure homogenizing and low-temperature cooling. The method comprises the following steps: dispersing the raw fibers in a sulfuric acid aqueous solution with the mass fraction of 10-20%, maintaining the raw fibers in the aqueous solution for 2-6 hours at 20-60 DEG C, adding a dispersing agent after dilution, centrifugal separation and cyclic dialysis, utilizing a high-pressure homogenizer for high-pressure homogenizing, simultaneously carrying out low-temperature cooling in the process of high-pressure homogenizingto obtain nano cellulose colloids and obtaining the nano celluloses through centrifugal separation and freeze drying, wherein the pressure is 1000-1200bar; and the cycle index is 4-16. The diameter and length of the obtained nano celluloses are respectively about 10-30nm and 300nm. The method has the beneficial effect of solving the following problems: the existing nano celluloses prepared by utilizing the homogenizers have wide and nonuniform diameter distribution; the fibers are interwoven in micron size; and the pressure and the temperature are raised in the process of high-pressure homogenizing.
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Description

technical field

[0001] The invention belongs to the preparation method of nanometer cellulose. Background technique

[0002] Nanocellulose, also known as cellulose nanocrystals, is a type of rigid rod-shaped single crystal cellulose (whiskers), with a diameter of 1-100 nm and a length of tens to hundreds of nanometers. In some literature reports, nanocellulose is also called cellulose nanowhiskers, nanocrystals, micro-nanofibrils and so on. Nanocellulose has renewable properties, high crystallinity, high aspect ratio, high specific surface area and high transparency, etc., and has good application prospects in food, medicine, papermaking, textiles and other fields.

[0003] Methods for preparing nanocellulose include hydrolysis, mechanical, biological, solvent, electrospinning, and ionic liquid dissolution. Among them, the high-pressure homogenization method is a common mechanical preparation method for preparing nanocellulose. During the high-pressure homogenization proc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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