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Preparation method for holocellulos nano composite film

A nano-composite, all-cellulose technology, applied in the field of preparation of all-cellulose nanocomposite films, can solve the problems of expensive solvents, harsh dissolution conditions, difficult to recycle, etc., and achieve good transparency and oxygen barrier properties, excellent physical and mechanical properties. , easy to dissolve

Inactive Publication Date: 2014-03-12
JIANGNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvents used in these preparation methods are generally expensive, difficult to recycle, and the dissolution conditions are relatively harsh, and the subsequent molding process is complicated, which makes the preparation cost of all-cellulose nanocomposites relatively high.

Method used

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  • Preparation method for holocellulos nano composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Preparation of microfibrillated cellulose aqueous suspension

[0014] The cellulose aqueous slurry is first ground with a planetary ball mill, and the added cellulose aqueous slurry accounts for two-thirds of the volume of the vacuum ball mill tank, and is ground at a speed of 600r / min for 20min to obtain a micron-sized cellulose aqueous suspension; The suspension was subjected to high-pressure homogenization treatment, and passed through the high-pressure homogenizer 30 times at a machine pressure of 113 MPa to prepare a microfibrillated cellulose aqueous suspension.

[0015] (2) Conversion of nanocellulose aqueous suspension dispersion medium

[0016] Centrifuge the nanocellulose aqueous suspension (the speed is 4000r / min, experience shows that at this speed, the nanocellulose will settle in the lower layer of the centrifuge tube without causing agglomeration; the dispersion time is 6min), and a part of it is separated and removed. Add water, add acetone, centrif...

Embodiment 2

[0024] (1) Preparation of Nanocellulose Whiskers Suspension

[0025] Fully swell the microcrystalline cellulose powder in deionized water. Under the condition of cold water bath, titrate concentrated sulfuric acid thereinto to mass fraction 64%, stir continuously until there is no obvious agglomeration, then place it in a constant temperature water bath at 45°C and stir for 2h; take a certain amount of deionized water and dilute it and carry out centrifugation (speed 12000r / min, time 10min), repeat several times until the upper layer is turbid, and collect the upper layer. Finally, through dialysis and ultrasonic treatment, the nanocellulose whisker aqueous suspension is prepared.

[0026] (2) Conversion of nanocellulose aqueous suspension dispersion medium

[0027] Centrifuge the nanocellulose aqueous suspension (the speed is 4000r / min, experience shows that at this speed, the nanocellulose will settle in the lower layer of the centrifuge tube without causing agglomeration;...

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Abstract

The invention relates to a preparation method for a holocellulos nano composite film. The preparation method comprises the following steps: utilizing a cellulose diacetate solution as a matrix phase, uniformly dispersing nano cellulose into a matrix solution, casting moulding, and realizing film forming after solvent volatilization under a vacuum negative-pressure condition; performing alkaline treatment on a composite film at normal pressure and under a closed condition, and removing acetyl of cellulose diacetate to produce regenerated cellulose so as to prepare the holocellulos nano composite film. The holocellulos nano composite film has good biphase compatibility, favorable transparency and oxygen insulation performance, and excellent mechanical property, the problems of solvent selection and process complexity in the preparation process of the holocellulos nano composite film are solved, and the preparation method can be widely applied to the fields of material processing, food packaging, degradable environmental-friendly materials and the like.

Description

technical field [0001] The invention relates to a preparation method of an all-cellulose nanocomposite film, belonging to the technical field of polymer-based composite materials. Background technique [0002] The whole cellulose composite material means that the reinforcement phase and the matrix phase in the composite material are both cellulose materials, while the whole cellulose nanocomposite material means that the reinforcement phase in the composite material is a nanoscale cellulose material. Due to the solution of the interface bonding problem between the fiber and the matrix, the all-cellulose nanocomposite material has very excellent mechanical properties. In addition, the abundant source, low price, renewable and complete degradation of cellulose make all-cellulose nanocomposites a promising composite material. [0003] The preparation of all-cellulose nanocomposites must first solve the problem of cellulose dissolution. The more traditional method is to dissolv...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J5/18C08L1/12C08L1/02
Inventor 王玮陈帅刘晓亚邱程广马收
Owner JIANGNAN UNIV
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