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Reed stem cellulose nano-fiber and preparation method thereof

A cellulose and nanofilament technology, applied in the field of nanomaterials, to achieve the effect of improving physical properties, high aspect ratio, and high reactivity

Active Publication Date: 2017-07-11
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research and report on the preparation of cellulose nanofibrils from reed stems, which is still a new topic

Method used

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  • Reed stem cellulose nano-fiber and preparation method thereof
  • Reed stem cellulose nano-fiber and preparation method thereof

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preparation example Construction

[0024] A method for preparing reed stem cellulose nanofilaments is prepared by the following steps.

[0025] Firstly, a pretreatment step: the reed stem is hydrolyzed and then dried to obtain a pretreated reed stem. Preferably, cut reed stems are dispersed in water, treated at a temperature of 120° C. to 180° C. and a pressure of 1.3 to 1.6 MPa for 60 to 240 minutes, and dried to obtain a pretreated reed stem.

[0026] Furthermore, in a preferred embodiment of the present invention, the reed stem is cut into small sections of 1-3 cm, and the reed stem is cut into an appropriate length, which is convenient for subsequent operations and consumes less energy.

[0027] Further, in a preferred embodiment of the present invention, in the pretreatment step, the solid-liquid ratio of reed stems and water is 1:6-10 g / mL.

[0028] Further, in a preferred embodiment of the present invention, the drying is air-drying, which may be natural air-drying or mechanical air-drying. Natural air...

Embodiment 1

[0046] A kind of reed stem cellulose provided in this embodiment is prepared according to the following steps::

[0047] First, take 100g of reed stems, cut them into 1-3cm segments, wash them with distilled water, transfer them to a reaction kettle, add 600mL of distilled water, raise the temperature to 120°C, and treat them for 240min at a pressure of 1.3MPa. Collect the pretreated reed stems. Air dry.

[0048] Then, take 1000g of absolutely dry reed stem pretreatment, add in 1.6(wt)% NaOH and 0.05(wt)% anthraquinone mixed solution of 10L, 25 ℃ and stir for 60min and then transfer to the electrothermal rotary reactor, Raise the temperature to 155° C., react for 90 minutes, continue to keep warm for 50 minutes, wash with distilled water, and remove lignin to obtain reed stem heddle cellulose.

[0049] Next, weigh 10g of reed stem heddle cellulose and disperse it in 100mL of distilled water, add 20mL of 30wt% H 2 o 2 The solution was heated and stirred in a water bath at 40...

Embodiment 2

[0053] A kind of reed stem cellulose provided in this embodiment is prepared according to the following steps::

[0054] First, take 100g of reed stems, cut them into 1-3cm segments, wash them with distilled water, transfer them to a reaction kettle, add 1000mL of distilled water, heat up to 180°C, and press at 1.6MPa for 60 minutes to collect the pretreated reed stems. Air dry.

[0055] Then, take 1000g of absolutely dry reed stem pretreatment, add in 20L of 2(wt)% NaOH and 0.1(wt)% anthraquinone mixed solution, transfer to the electrothermal rotary reaction kettle after stirring at 35°C for 20min, Raise the temperature to 160°C, react for 45 minutes, continue to keep warm for 90 minutes, wash with distilled water, and remove lignin to obtain reed stem heddle cellulose.

[0056] Next, weigh 10g of reed stem heddle cellulose and disperse it into 50mL of distilled water, add 20mL of 30wt% H 2 o 2 The solution was heated and stirred in a water bath at 60° C. to react for 60 m...

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Abstract

The invention provides a reed stem cellulose nano-fiber and a preparation method thereof, belonging to the technical field of nano-materials. According to the preparation method for the reed stem cellulose nano-fiber, reed stems are used as a raw material, hydrolysis pretreatment, alkaline liquor treatment, bleaching treatment, TEMPO oxidation treatment and microjet nanometer homogenization are successively carried out so as to obtain the reed stem cellulose nano-fiber. The preparation method is simple in production process and easy to implement and can well improve the comprehensive utilization value of reeds. The reed stem cellulose nano-fiber prepared in the invention has the advantages of a high length-diameter ratio, a large specific surface area, high young modulus, high reaction activity, good mechanical properties, biodegradability and easiness in compounding, and is extensively applicable to fields like optics, electricity and biomedicine.

Description

technical field [0001] The invention relates to the field of nanometer materials, and in particular to a reed stem cellulose nanofilament and a preparation method thereof. Background technique [0002] Energy crisis and resource shortage are serious problems facing the world at present, and how to make full use of resources is an important challenge facing mankind. Lignocellulosic resources are the most abundant renewable resources on earth, which can provide basic raw materials for human production, energy and materials. my country is relatively poor in timber resources, but rich in non-timber resources (agricultural straw, bamboo, reed, bagasse). Phragmites reed is a perennial herbaceous plant of the Poaceae family. It is a highly differentiated morphologically differentiated species of meadow and wetland vegetation and is widely distributed all over the world. According to statistics, about 3 million tons of reeds are planted and produced in the lake area in my country ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00
CPCD01F2/00
Inventor 姚进李知函毛龙肖晓冯正洋郑思洁刘静怡
Owner HUNAN UNIV OF TECH
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