Preparation method of straw micro-nano cellulose

A technology of micro-nano cellulose and straw, which is applied in fiber raw material processing, textiles and paper making, etc. It can solve the problems of many nano-cellulose operations and low aspect ratio of rod-shaped nano-cellulose, and achieve easy operation and high mechanical strength. High, good biocompatibility effect

Active Publication Date: 2011-01-19
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problem of many steps in preparing nano-cellulose in the prior art and the

Method used

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  • Preparation method of straw micro-nano cellulose
  • Preparation method of straw micro-nano cellulose
  • Preparation method of straw micro-nano cellulose

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specific Embodiment approach 1

[0016] Specific embodiment 1: The preparation method of straw micro-nano cellulose in this embodiment is carried out according to the following steps: 1. Cooking: cut the straw short, place it in the steel inner barrel of the autoclave, add delignification reagent, and the temperature of the reactor 159~166℃, heating and cooking for 40~60min; 2. Soaking and washing: Take out the boiled straw in the steel inner barrel, soak it in tap water for 12-16 hours; Sewn vibrating separation screen to obtain crude fiber; 4. Bleaching: add NaClO to the obtained crude fiber 2 , glacial acetic acid and distilled water, heat in a microwave oven with a power of 600W for 30-45min, and add NaClO every 10-15min 2 5. Hydrolysis and ultrasonic treatment: add sulfuric acid solution with a mass concentration of 50% to 60% to the solid, stir and hydrolyze in a water bath at 40 to 45 ° C for 1 to 5 hours, and then 6. Add sodium bicarbonate to adjust the pH value to 6-7, then wash with distilled water...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the delignification reagent added in step 1 is Na 3 PO 4 ·12H 2 O, anthraquinone and ethanol solution with a concentration of 45% by mass, add 1.5-1.6g Na per gram of straw 3 PO 4 ·12H 2 O, 0.0005 g of anthraquinone and 10 to 15 mL of an ethanol solution with a mass percentage concentration of 45%. Others are the same as the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the delignification reagent added in step 1 is Na 3 PO 4 ·12H 2 O, anthraquinone and tap water, add 3-3.2g Na per gram of straw 3 PO 4 ·12H 2 O, 0.001 g of anthraquinone and 10 to 14 mL of tap water. Others are the same as the first embodiment.

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Abstract

The invention discloses a preparation method of straw micro-nano cellulose, relating to a preparation method of micro-nano cellulose. The invention solves the problems that the prior art for preparing nano cellulose comprises more steps, and rodlike nano cellulose has low draw ratio. The preparation method is as follows: 1, stewing; 2, dipping and washing; 3, screening; 4, bleaching; 5, carrying out hydrolysis and supersonic treatment; and 6, neutralizing, rinsing, breaking, decentralizing and drying to obtain the straw micro-nano cellulose. The micro-nano cellulose prepared by the preparation method of the invention has fibroid appearance, has the diameter of 10-200 nm and the length of 200-10 mu m, and has high draw ratio and large specific surface area. The invention is applied to the field of composite materials.

Description

technical field [0001] The invention relates to a preparation method of micro-nano cellulose. Background technique [0002] Due to the over-exploitation and use of non-renewable resources such as oil, natural gas, and minerals, resource shortage has become a major problem facing human society that needs to be solved urgently. The development and utilization of renewable resources is of great significance to ensure the sustainability of resources, reduce environmental pollution and improve economic benefits. [0003] Straw is a general term for the stem and leaf parts of mature crops. Usually refers to the remaining part of crops such as wheat, rice, and corn after harvesting the seeds. my country's straw output is rich, about 650 million tons per year. More than half of the products of crop photosynthesis exist in straw, which is a multi-purpose renewable biological resource with abundant resources and low price. [0004] Cellulose is mainly synthesized by photosynthesis...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 刘志明王海英卜良霄刘黎阳郭盼龙李振雷
Owner NORTHEAST FORESTRY UNIVERSITY
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