Method for preparing micro-fibrillated nanocellulose by use of degummed ramie

A technology of nanocellulose and ramie refined and dried hemp, which is applied in fiber raw material processing, textile and papermaking, etc., can solve the problems of equipment corrosion, high energy consumption, low performance of final products, etc., and achieves less negative environmental impact and low requirements for preparation conditions. , the effect of low price of raw materials

Inactive Publication Date: 2014-07-23
DONGHUA UNIV +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The chemical acid hydrolysis method takes a long time to react, and the preparation process requires a large amount of high-concentration sulfuric acid or hydrochloric acid, which is likely to cause corrosion of equipment and environmental pollution, and it is difficult to recover and treat the residue after the reaction; the method of high-pressure homogeneous dissociation requires High pressure and special equipment, power and energy consumption are relatively large, and it is prone to clogging of the high-pressure homogenizer, which makes the preparation process difficult to achieve continuous; the biological method extracts nanocellulose from bacteria or tunicate cellulose. Yield and The efficiency is low, the cost is high, and the performance of the final product is also low; there are many deficiencies in the equipment of electrospinning, the cross-sectional distribution of the obtained nanocellulose is very wide, and the structure and performance of the obtained product are not perfect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing microfibrillated nanocellulose from ramie dry hemp is as follows:

[0024] The ramie fine dry hemp is pulverized into short fibers with a fineness of 20 mesh with a pulverizer (Wiley Mill Model 4, Thomas Scientific Company of the United States), and put into a container with a sealing ring to balance the moisture, and the moisture regain of the short fibers is measured to be 9.2%. The weighed short fiber quality is 21.20g, and its fiber dry weight is calculated according to the moisture regain to be 19.25g. Add distilled water to make the cellulose mass concentration at 1%, soak for 24h to make it fully wet, use a beater (73-18Pulp Disintegrator, U.S. TMI company) to make cellulose slurry with a speed of 800rpm for 20min; Put the material into the ultrafine refiner (Super Masscolloider MKCA6-2, Japan Zengxing Sangyo Co., Ltd.), then set the distance between the two discs of the ultrafine refiner to be -40 μm, and use the ultrafine refiner at 1000r...

Embodiment 2

[0026] A method for preparing microfibrillated nanocellulose from ramie dry hemp is as follows:

[0027] The finely dried ramie is crushed into short fibers with a fineness of 60 mesh with a pulverizer, put into a container with a sealing ring to balance the moisture, and the moisture regain of the short fibers is measured to be 8.9%. The weighed short fiber quality is 22.02g, and its fiber dry weight is calculated according to the moisture regain to be 20.06g. Add distilled water to make the cellulose mass concentration at 3%, soak for 36 hours to make it fully wet, stir with a beater for 30 minutes at a speed of 1000rpm to make a cellulose slurry; put the prepared slurry into an ultrafine refiner, and then Set the distance between the two discs of the ultra-fine refiner to -80 μm, and use the ultra-fine refiner to continuously grind 80 times at a speed of 3000 rpm, and the grinding time is 6 hours, so that the cellulose is continuously refined and the suspension is obtained....

Embodiment 3

[0029] A method for preparing microfibrillated nanocellulose from ramie dry hemp is as follows:

[0030]The finely dried ramie is crushed into short fibers with a fineness of 40 mesh with a pulverizer, put into a container with a sealing ring to balance the moisture, and the moisture regain of the short fibers is measured to be 9.2%. The weighed short fiber quality is 21.10g, and its fiber dry weight is calculated according to the moisture regain to be 19.16g. Add distilled water to make the cellulose mass concentration at 6%, soak for 48 hours to make it fully wet, stir with a beater at a speed of 1200rpm for 50min to make a cellulose slurry; put the prepared slurry into an ultrafine refiner, and then Set the distance between the two disks of the ultra-fine refiner to -90 μm, and use the ultra-fine refiner to continuously grind 70 times at a speed of 2000 rpm, and the grinding time is 7 hours, so that the cellulose is continuously refined and the suspension is obtained. Fina...

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Abstract

The invention relates to a method for preparing micro-fibrillated nanocellulose by use of degummed ramie. The degummed ramie is used as a raw material and is crushed into short fibers by a physical-mechanical method, then the short fibers are soaked with distilled water, and then are prepared into cellulose pulp by a beating machine; the cellulose pulp is ground continuously in a reciprocating manner by an ultra-fine refiner to enable the cellulose to be stressed in a refining manner to obtain suspension liquid; and finally, the nanocellulose and water are separated by a centrifugal washing method, and drying is carried out by a vacuum freezing method to finally obtain the powdery micro-fibrillated nanocellulose. The method is simple, has high efficiency, raw material price is low, no chemical agent needs to be added, the energy consumption is low, pollution is slight, the control is easy, and the prepared micro-fibrillated nanocellulose has high yield, good repeatability and good performances and has important scientific significance and considerable application prospect.

Description

technical field [0001] The invention relates to a method for preparing microfibrillated nano-cellulose by using ramie fine-dried hemp, and belongs to the technical field of comprehensive utilization of hemp fiber in the field of textiles and the field of nano-cellulose preparation in the field of material science. Background technique [0002] At present, natural cellulose is the most abundant high-molecular polymer in nature. It generally exists in natural plants such as wood, bamboo, cotton, and hemp. It has abundant sources, low price, and is biodegradable and renewable. With the enhancement of the concept of environmental protection and the development of nanotechnology, people began to pay attention to the preparation of nanocellulose from natural fibers. Nanocellulose refers to cellulose with at least one dimension of 100nm or less on the scale, and is a new type of polymer functional material. Microfibrillated cellulose (MFC for short), which belongs to a kind of nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 李召岭孟超然李可欣郁崇文白洋臧英明
Owner DONGHUA UNIV
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