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Preparation method for wheat straw nano-cellulose whiskers

A technology of nano-cellulose and wheat straw, which is applied in the fields of cellulose raw material pulping, fiber raw material, fiber raw material treatment, etc., can solve the problems of low production rate, large discrete size, etc., and achieve high specific surface area and high transparency , high-purity effect

Inactive Publication Date: 2017-12-12
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of wheat straw nanocellulose whiskers for the problems of large discrete size and low production rate of wheat straw nanocellulose whiskers

Method used

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  • Preparation method for wheat straw nano-cellulose whiskers

Examples

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Effect test

example 1

[0019] Take 3kg of wheat straw and cut it into 5cm pieces, wash it twice, put it in a drying oven at 60°C and dry it for 2 hours, then transfer it to a steam explosion tank, and put water vapor at 220°C into the steam explosion tank to reach the pressure After holding for 3 minutes, open the valve of the steam explosion tank to release the pressure, take out the straw and wash it twice with 80°C deionized water. In a 0.3% sodium chlorite solution, heat and react at 70°C for 40 minutes, filter to obtain a filter cake, wash the filter cake with deionized water for 3 times, air-dry it naturally, and then transfer to 6L containing 0.75% potassium hydroxide and 0.25% In the mixed solution of sodium sulfide, heat the reaction at 80°C for 1 hour, adjust the pH to neutral with glacial acetic acid after cooling to room temperature, filter to obtain the filtrate, wash the filtrate with deionized water for 3 times, and then place it in an 80°C drying oven Dry for 2 hours to obtain wheat ...

example 2

[0021] Take 4kg of wheat straw and cut it into 57cm fragments, wash it twice, put it in a drying oven at 62°C for 2.5 hours, then transfer it to a steam explosion tank, and pass water vapor at a temperature of 235°C into the steam explosion tank The pressure is 2MPa, keep it for 4 minutes, open the valve of the steam explosion tank to release the pressure, take out the straw and wash it twice with 82°C deionized water, and dry it naturally to get the steam explosion treated wheat straw, take 250g of the steam exploded wheat straw, add 7.5L quality Fraction of 0.3% sodium chlorite solution, at 72 ° C, heated for 50 minutes, filtered to obtain a filter cake, washed with deionized water 3 times and then air-dried, then transferred to 7L containing 0.75% potassium hydroxide and 0.25 % sodium sulfide mixed solution, heated at 85°C for 1.5h, cooled to room temperature, adjusted pH to neutral with glacial acetic acid, filtered to obtain filtrate, washed with deionized water for 4 time...

example 3

[0023]Take 35kg of wheat straw and cut it into 10cm fragments, wash it with water for 3 times, put it in a drying oven at 65°C for 3 hours, then transfer it to a steam explosion tank, and put water vapor at 250°C into the steam explosion tank to reach the pressure After holding for 5 minutes, open the valve of the steam explosion tank to release the pressure, take out the straw and wash it three times with 85°C deionized water, and dry it naturally to obtain steam explosion treated wheat straw. Take 300g of steam exploded wheat straw and add 9L mass fraction In a 0.3% sodium chlorite solution, heat and react at 75°C for 60 minutes, filter to obtain a filter cake, wash the filter cake with deionized water for 5 times, air-dry it naturally, and then transfer it to 9L containing 0.75% potassium hydroxide and 0.25% In the mixed solution of sodium sulfide, heat the reaction at 90°C for 2 hours, adjust the pH to neutral with glacial acetic acid after cooling to room temperature, filt...

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Abstract

The invention relates to a preparation method for wheat straw nano-cellulose whiskers, and belongs to the technical field of new materials. According to the preparation method, wheat straw is subjected to blasting treatment by steam, the wrapping effect of lignin and hemicellulose on cellulose is broken, most hemicellulose and pectin are separated and removed, sodium chlorite is adopted to conduct oxidation degradation on the lignin, alkali treatment is conducted to further remove residual impurities, and C6 on cellulose hydroxyl is oxidized into carboxyl; a high-speed homogeneous dispersing method is combined for freezing drying to obtain the nano-cellulose whiskers, wherein the nano-cellulose whiskers with less defects grow in the mode of a single-crystal structure and are small and thin in size, high in purity, needle-shaped and highly ordered in atom arrangement; compared with ordinary natural cellulose, the nano-cellulose whiskers have the advantages of being high in specific surface area, purity, crystallinity, strength, modulus and transparency and super-fine in structure.

Description

technical field [0001] The invention relates to a preparation method of wheat straw nano-cellulose whiskers, belonging to the technical field of new materials. Background technique [0002] my country is a large agricultural country, and our country is also a country with relatively scarce resources. If we can make good use of straw resources, it will be of great significance to alleviate the shortage of resources in our country, develop the economy, and protect the environment. [0003] Straw contains a large amount of natural plant fiber, which has high strength and modulus. The research on using straw fiber as reinforcing fiber for composite materials has gradually attracted people's interest. As a natural polymer reinforcement material, straw fiber has many advantages, such as cheap and easy to obtain, wide sources, low density, high tensile strength and modulus, low energy consumption for processing, and has renewable and ecological environment. Compatibility, less env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21B1/06D21C3/00
CPCD21B1/02D21B1/061D21C3/00
Inventor 龙海燕王之霖史玉兰
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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