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Method for preparing straw cellulose nano crystal whisker

A technology of straw cellulose and nano-whiskers, which is applied in fiber raw materials, fiber raw material processing, textiles and papermaking, etc., can solve the problems of inability to prepare cellulose nano-whiskers, low content of straw cellulose, and low crystallinity, and achieve Low cost, simple preparation process, and the effect of increasing added value

Inactive Publication Date: 2015-07-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of straw cellulose nano-whiskers, to solve the problems of low straw cellulose content, low crystallinity, and low strength, and the existing methods cannot prepare cellulose nano-whiskers, and to develop high Added value application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of rice straw cellulose nano-whiskers, the specific steps are:

[0029] Step 1: Pretreatment: Clean the rice straw with tap water and dry it in a vacuum oven at 60°C to constant weight. Place it in 150g / L NaOH solution at 20±2°C and 65±3%. 1:15, soak for 24 hours, take out and wash, and dry in a vacuum oven at 60°C to constant weight;

[0030] The second step: cellulose purification treatment: the pretreated rice straw is placed in an alkaline solvent system for cellulose purification treatment. The alkaline solvent system contains NaOH, NaOH 2 SO 3 And the aqueous system of JFC, by adding NaOH, Na 2 SO 3 It is prepared by dissolving JFC and JFC in water, and the ratio of the alkaline solvent system is that the concentration of NaOH is 20g / L, NaOH 2 SO 3 The concentration is 15g / L, the JFC concentration is 4g / L; the treatment time is 2h, the temperature is 110°C, and the liquor ratio is 1:10; after the treatment, take it out and wash it, and dr...

Embodiment 2

[0039]A preparation method of wheat straw cellulose nano whiskers, the specific steps are:

[0040] Step 1: Pretreatment: Clean the wheat straw with tap water and dry it in a vacuum oven at 60°C to constant weight. Place it in 120g / L NaOH solution at 20±2°C and 65±3%. 1:30, soaked for 36 hours, taken out and washed, and dried in a vacuum oven at 60°C to constant weight;

[0041] The second step: cellulose purification treatment: the pretreated wheat straw is placed in an alkaline solvent system for cellulose purification treatment, and the alkaline solvent system contains NaOH, NaOH 2 SO 3 And the aqueous system of JFC, by adding NaOH, Na 2 SO 3 It is prepared by dissolving JFC and JFC in water, and the ratio of the alkaline solvent system is that the concentration of NaOH is 15g / L, NaOH 2 SO 3 The concentration is 15g / L, the JFC concentration is 6g / L; the treatment time is 2h, the temperature is 120°C, and the liquor ratio is 1:15; after the treatment, take it out and wa...

Embodiment 3

[0050] A method for preparing rape straw cellulose nano-whiskers, the specific steps are:

[0051] The first step: pretreatment: clean the rape stalks with tap water and dry them in a vacuum oven at 60°C to constant weight. 1:20, soak for 24 hours, take out and wash, and vacuum dry in an oven at 60°C to constant weight;

[0052] The second step: cellulose purification treatment: the pretreated rape stalks are placed in an alkaline solvent system for cellulose purification treatment. The alkaline solvent system contains NaOH, NaOH 2 SO 3 And the aqueous system of JFC, by adding NaOH, Na 2 SO 3 It is prepared by dissolving JFC and JFC in water. The ratio of the alkaline solvent system is that the concentration of NaOH is 25g / L, and the concentration of NaOH is 25g / L. 2 SO 3 The concentration is 10g / L, the JFC concentration is 6g / L; the treatment time is 2h, the temperature is 100°C, and the bath ratio is 1:10; after the treatment, take it out and wash it, and dry it in a va...

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Abstract

The invention provides a method for preparing straw cellulose nano crystal whisker. The method is characterized by comprising the steps: utilizing crop straws as raw materials, performing pretreatment and cellulose purifying treatment, mechanically grinding into straw cellulose powder; performing DMSO (Dimethylsulfoxide) treatment and TEMPO (Tetramethylpiperidine) oxidation treatment and stirring at high speed, thereby obtaining straw cellulose powder suspension liquid; performing centrifugal treatment, decentralized treatment and freezing and drying, thereby obtaining straw cellulose nano crystal whisker. The preparation process is simple and has high yield and low energy consumption; no toxic and harmful matters are discharged during production and the preparation process has a capability of large-scale promotion and application; utilized straws can be wastes of plant crops such as rice straws, wheat straws and oilseed rape straws; the raw material has wide source and cost is low; pollution to the environment is solved and additional value of straws is improved.

Description

technical field [0001] The invention relates to a preparation method of straw cellulose nano-whiskers, belonging to the technical field of textile materials. Background technique [0002] my country is a large agricultural country, and a large amount of agricultural waste is produced every year. The straw waste alone reaches 700 million tons per year, and only about 3% of it is used after technical treatment. Most of the others are incinerated, or even about 150 million tons of straw are burned in the open air, causing a great waste of resources and environmental pollution, so it is urgent to develop new uses for straw. [0003] Natural cellulose nanowhiskers have the advantages of high strength, high modulus, good adsorption and degradability, and are widely used in biomedicine, food, textile and other fields. At present, natural cellulose nanowhiskers mainly come from wood, cotton linters, hemp fibers, etc., but there are few reports on the use of straw as raw materials. ...

Claims

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Application Information

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IPC IPC(8): D21B1/06D21B1/02D21C1/06C08B15/02C08B15/08
CPCC08B15/02C08B15/08D21B1/02D21B1/021D21B1/023D21B1/06D21C1/06
Inventor 刘丽芳刘慧赵艳娇李莉王晓婷薛锦茹俞子俊
Owner DONGHUA UNIV
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