Method for preparing banana cellulose nanofibers by using steam explosion technology

A technology of nanofiber and cellulose, which is applied in the chemical post-treatment of fibers, fiber treatment, textiles and papermaking, etc. It can solve the problems of high cost, complicated process and environmental pollution, and achieve low production cost, simple process and high efficiency Effect

Inactive Publication Date: 2012-07-18
HAIKOU EXPERIMENTAL STATION CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing banana cellulose nanofibers using steam explosion technology in view of the deficiencies in the prior art. The crude fiber of banana stalks discarded in banana orchards is used as the main raw material, and chemical treatment and steam explosion technology are used in conjunction. The combined method solves the de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Pre-alkali treatment: Cut 50g of banana crude fiber into short fibers with a length of 3cm, soak in NaOH solution with a concentration of 15g / L for 30h at room temperature, wash with water until neutral and dehydrate.

[0020] 2. Steam explosion treatment: put the pretreated banana crude fiber into a steam explosion tank, hold the pressure for 60s under the steam explosion pressure of 2.0Mpa, release it instantly, and then wash to neutral.

[0021] 3. Chemical rinsing: Soak the banana fiber obtained by steam explosion treatment in a solution containing 1.8% Na 2 SiO 3 , 1.5% NaOH, 1.49% H 2 o 2 In the bleaching solution, the solid-to-liquid ratio was 1:15, the temperature was 52° C., treated for 5 hours, and washed until neutral to obtain 34 g of banana nanofibers with a diameter of 1 nm to 100 nm, with a yield of 68%.

Embodiment 2

[0023] 1. Pre-alkali treatment: Cut 50g of banana crude fiber into short fibers with a length of 6cm, soak in NaOH solution with a concentration of 30g / L for 25h at room temperature, wash until neutral and dehydrate.

[0024] 2. Steam explosion treatment: Put the pretreated banana crude fiber into the steam explosion tank, maintain the pressure for 160s under the steam explosion pressure of 2.5Mpa, release it instantly and wash to neutral.

[0025] 3. Chemical rinsing: Soak the banana fiber obtained by steam explosion treatment in a solution containing 1.3% Na 2 SiO 3 , 2.3% NaOH, 2.5% H 2 o 2 In the bleaching solution, the solid-to-liquid ratio was 1:18, the temperature was 58° C., treated for 3 hours, and washed until neutral to obtain 32 g of banana nanofibers with a diameter of 1 nm to 100 nm, with a yield of 64%.

Embodiment 3

[0027] 1. Pre-alkali treatment: Cut 50g of banana crude fiber into short fibers with a length of 8cm, soak in NaOH solution with a concentration of 35g / L for 40h at room temperature, wash with water until neutral and dehydrate.

[0028] 2. Steam explosion treatment: put the pretreated banana crude fiber into the steam explosion tank, maintain the pressure for 250s under the steam explosion pressure of 1.6Mpa, release it instantly, and then wash to neutral.

[0029] 3. Chemical rinsing: Soak the banana fiber obtained by steam explosion treatment in a solution containing 1.5% Na 2 SiO 3 , 2.8% NaOH, 3.2% H 2 o 2 In the bleaching solution, the solid-to-liquid ratio was 1:23, the temperature was 55° C., treated for 6 hours, and washed until neutral to obtain 30.5 g of banana nanofibers with a diameter of 1 nm to 100 nm, with a yield of 61%.

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Abstract

The invention relates to a method for preparing banana cellulose nanofibers by using a steam explosion technology. The method comprises the following steps of: shearing banana crude fibers into short fibers with the length of 2-10cm, soaking in a NaOH solution, washing until neutrality, performing steam explosion treatment, rinsing by using a bleaching solution, and washing until neutrality to obtain banana nanofibers, wherein the yield is over 60 percent. Waste banana stem crude fibers in banana gardens are taken as main raw materials, a method of combining chemical treatment and the steam explosion technology is adopted, defects of high cost, complicated procedures and environmental pollution in the traditional method for preparing nanofibers are overcome, a production period of the nanofibers is greatly shortened, the efficiency is improved, and the method has the characteristics of simple process, low production cost, recycle of an alkaline liquor and the leaching solution, and the like, and lays a foundation for development and utilization of banana fibers.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a method for preparing banana cellulose nanofibers, in particular to a method for preparing banana cellulose nanofibers by steam explosion technology using banana crude fibers as raw materials. Background technique [0002] The banana industry is one of the pillar industries of tropical agriculture in China. The banana production areas in my country produce more than 7 million tons of banana stalks every year. At present, they are directly returned to the field or discarded, which not only causes a great waste of resources but also destroys ecosystem. A large number of studies have shown that banana fiber has many advantages such as: high strength, small elongation, fast moisture absorption and moisture release, high initial modulus, and good hygienic performance. In addition, as a kind of natural fiber, banana fiber has the advantages of renewable, degradable, abundant sources, ...

Claims

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Application Information

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IPC IPC(8): D01C1/00
Inventor 盛占武高锦合金志强
Owner HAIKOU EXPERIMENTAL STATION CHINESE ACAD OF TROPICAL AGRI SCI
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