Method for preparing renewable nano-celluloses

A nanocellulose and re-adding technology, which is applied in the fields of cellulose pulp post-treatment, fiber raw material treatment, textiles and papermaking, etc., can solve the problems of difficult scale preparation of nanocellulose, restricting development, low efficiency, etc., to achieve operational Convenience, improved production efficiency, and broad application prospects

Inactive Publication Date: 2016-05-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned preparation methods generally have problems such as low efficiency, high aging cost, and easy agglome

Method used

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  • Method for preparing renewable nano-celluloses
  • Method for preparing renewable nano-celluloses
  • Method for preparing renewable nano-celluloses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 5g of dry weight pulp, place it in 100mL of water and soak for 4 hours, mechanically stir the soaked pulp for 30 minutes at a speed of 300 rpm, then stir for 2 hours at a speed of 900 rpm, and then The stirred pulp was pulverized in an ultrasonic pulverizer for 10 minutes to obtain a pulp suspension, which was set aside.

[0034] Weigh 78mg TEMPO and 514mgNaBr, add 125mL deionized water, stir and dissolve completely to obtain TEMPO / NaBr mixed solution, subsequently, add the pulp suspension prepared above into the above-mentioned TEMPO / NaBr mixed solution for ultrasonic dispersion for 10 minutes, then add 30mL mass concentration 12% NaClO solution, at room temperature, magnetic stirring reaction for 1 hour, then dropwise add NaOH solution with a mass concentration of 0.5mol / L, control the pH value of the reaction system at 10.5, continue stirring reaction at room temperature for 3h to obtain TEMPO / NaClO / NaBr system oxidation treatment of pulp solution.

[0035] U...

Embodiment 2

[0040] Same as Example 1, but the amount of TEMPO and NaBr in step (2) was changed to 39 mg and 257 mg, and the amount of NaClO solution with a mass concentration of 12% was changed to 15 mL.

Embodiment 3

[0042] The same as in Example 1, but the amount of TEMPO and NaBr in step (2) was changed to 117 mg and 771 mg, and the amount of NaClO solution with a mass concentration of 12% was changed to 45 mL.

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Abstract

The invention relates to a method for preparing renewable nano-celluloses. The method includes pre-treating paper pulp by the aid of mechanical processes and then carrying out catalytic oxidation treatment on the paper pulp by the aid of TEMPO/NaClO/NaBr systems; ultrasonically smashing the paper pulp and carrying out high-pressure homogenization treatment on the paper pulp to obtain nano-cellulose suspension; treating the nano-cellulose suspension by the aid of semi-baking/semi-natural static drying processes to obtain the renewable nano-celluloses. The method has the advantages that the renewable nano-celluloses can be synthesized by the aid of the method with combinations of the mechanical processes and chemical processes, accordingly, the production cost of the nano-celluloses can be greatly reduced, the production efficiency can be improved, the yield can reach 95% at least, the surfaces of the nano-celluloses can be modified, and the renewable nano-celluloses are excellent in mechanical property and heat resistance; the renewable nano-celluloses are made of the paper pulp, TEMPO and the like, water is used as a solvent, main raw materials can be recycled, toxic reagents and medicines are omitted in integral production procedures, accordingly, environments can be protected, and energy can be saved; the renewable nano-celluloses can be produced in an environment-friendly manner, the method is easy and convenient to implement and free of environmental pollution and has a broad application prospect, the renewable nano-celluloses are high in preparation yield and low in cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and new materials, and in particular relates to a preparation method of renewable nano-cellulose. Background technique [0002] In recent years, with the decline of oil and coal reserves, the rise of energy costs and the increasing attention and attention to environmental pollution in various countries, the application of renewable resources in industry, science and technology, and medicine has become more and more extensive. Cellulose has gradually entered the field of vision of materials due to its abundant reserves in nature and its excellent characteristics of renewability and degradability. Nanocellulose (NCC) is an ultrafine fiber with a diameter of less than 100nm, and it is also the smallest physical structural unit of cellulose. Compared with non-nanocellulose, nanocellulose has many excellent properties, such as high crystallinity, high purity, high Young's modulus, high streng...

Claims

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Application Information

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IPC IPC(8): D21C9/00
CPCD21C9/004D21C9/005
Inventor 杨正龙
Owner TONGJI UNIV
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