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Cornstalk nanocellulose whiskers and preparation method and application thereof

A technology of nano-cellulose and corn stalks, which is applied in fiber raw material processing, textiles and papermaking, non-woody plants/crop pulp, etc., can solve the problems of complex waste liquid components, environmental pollution, and increased production costs, and achieve chemical conservation The drug and the preparation method are simple and easy, and the effect of reducing the difficulty of handling

Inactive Publication Date: 2016-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are all pretreated by chemicals, which increases the amount of pretreatment chemicals and the difficulty of waste liquid treatment, which may be unfavorable to environmental protection; and the acid concentration in the subsequent acid hydrolysis process is high, which increases production costs and the composition of waste liquid is complex. Increased the difficulty of treatment, once the waste water is not treated properly, it may cause environmental pollution

Method used

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  • Cornstalk nanocellulose whiskers and preparation method and application thereof
  • Cornstalk nanocellulose whiskers and preparation method and application thereof
  • Cornstalk nanocellulose whiskers and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation method of corn stalk nano cellulose whisker, such as figure 1 As shown, the steps are as follows:

[0041] (1) Cut the corn stalks into 2-3cm sections after removing pith and knots, and balance the moisture for 1 week after screening.

[0042] The treated corn stalks are cooked by alkaline method, and the amount of alkali used is 14% (for absolute dry raw materials, take Na 2 O meter), degree of sulfide 13% (for absolute dry raw materials, in Na 2 O meter), the maximum temperature is 155 ° C, the temperature is raised for 1.5 h, and the heat preservation is 2 h to obtain corn stalk pulp.

[0043]The obtained cornstalk pulp is screened, and the aperture of the screen is 60 mesh. After the pulp was extracted for 6 hours with a phenylethanol mixture with a volume ratio of 2:1 in a Soxhlet extractor, it was treated with an acidified sodium chlorite solution at 75°C for 1 hour to purify the fibers. Then bleach with a hydrogen peroxide solution, the ...

Embodiment 2

[0048] A preparation method of corn stalk nanocellulose whiskers, the steps are as follows:

[0049] (1) Cut the corn stalks into 2-3cm sections after removing pith and knots, and balance the moisture for 1 week after screening.

[0050] The treated corn stalks are cooked by alkaline method, and the amount of alkali used is 14% (for absolute dry raw materials, take Na 2 O meter), degree of sulfide 13% (for absolute dry raw materials, in Na 2 O meter), the maximum temperature is 155 ° C, the temperature is raised for 1.5 h, and the heat preservation is 2 h to obtain corn stalk pulp.

[0051] The obtained cornstalk pulp is screened, and the aperture of the screen is 60 mesh. After the pulp was extracted for 6 hours with a phenylethanol mixture with a volume ratio of 2:1 in a Soxhlet extractor, it was treated with an acidified sodium chlorite solution at 75°C for 1 hour to purify the fibers. Then bleach with a hydrogen peroxide solution, the concentration is 3%, the temperatur...

Embodiment 3

[0056] A preparation method of corn stalk nanocellulose whiskers, the steps are as follows:

[0057] (1) Cut the corn stalks into 2-3cm sections after removing pith and knots, and balance the moisture for 1 week after screening.

[0058] The treated corn stalks are cooked by alkaline method, and the amount of alkali used is 14% (for absolute dry raw materials, take Na 2 O meter), degree of sulfide 13% (for absolute dry raw materials, in Na 2 O meter), the maximum temperature is 155 ° C, the temperature is raised for 1.5 h, and the heat preservation is 2 h to obtain corn stalk pulp.

[0059] The obtained cornstalk pulp is screened, and the aperture of the screen is 60 mesh. After the pulp was extracted for 6 hours with a phenylethanol mixture with a volume ratio of 2:1 in a Soxhlet extractor, it was treated with an acidified sodium chlorite solution at 75°C for 1 hour to purify the fibers. Then bleach with a hydrogen peroxide solution, the concentration is 3%, the temperatur...

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Abstract

The invention belongs to the field of high polymer materials and particularly discloses cornstalk nanocellulose whiskers and a preparation method and application thereof. The molecular chain structural formula of the cornstalk nanocellulose whiskers is shown as in the described formula (1), wherein n is a natural number less than 200, and the molecular weight of cornstalk nanocellulose is 10000-30000. The preparation method of the cornstalk nanocellulose whiskers is simple, and high-temperature high-pressure hydrolysis pretreatment is adopted for full fibering; compared with acid or alkaline pretreatment in other nanocellulose preparation methods, the pretreatment method has the advantages that chemicals in the pretreatment process are saved, difficulty in treatment of waste fluid in the pretreatment process is lowered, and further acid concentration of subsequent acid hydrolysis cellulose can be lowered.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a corn stalk nano-cellulose whisker and a preparation method and application thereof. Background technique [0002] With the improvement of people's living standards, the consumption of resources and energy is also increasing, resulting in the shortage of resources and the aggravation of the energy crisis. In the process of people looking for solutions to problems, the development and utilization of biomass energy has become more and more aroused. people's attention. In nature, cellulose is a high-molecular substance synthesized by plants through photosynthesis. The global annual output is as high as several hundred million tons. It is a natural organic high-molecular material with abundant sources and low price. There are abundant fibers in corn stalks white. However, natural cellulose has certain defects in physical form and chemical properties, such as low streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21C5/00
CPCD21C5/00D21H11/12
Inventor 杨仁党李金鹏王斌
Owner SOUTH CHINA UNIV OF TECH
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