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Hydrophobization modification method for ramie nano cellulose

A technology of nano-cellulose and hydrophobization, which is applied in the field of chemical modification of nano-cellulose, which can solve the problems of easy residual chemical harmful substances, harsh reaction conditions, complex reaction routes, etc., and achieve low raw material costs, reduced agglomeration, and wide application foreground effect

Active Publication Date: 2014-08-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have defects and deficiencies to a certain extent. Some require special equipment, some have high process requirements, some are easy to damage fibers, and some are easy to leave chemical harmful substances. Carried out in highly toxic organic solvents such as tetrahydrofuran, the reaction conditions are harsh, the reaction route is complicated, and the cost of industrial implementation is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method of hydrophobizing modification of ramie nanocellulose is as follows:

[0025] The ramie nanocellulose is put into a container with a sealing ring to balance moisture, and the moisture regain of the nanocellulose is determined to be 9.0%. Weigh 21.20g of nanocellulose, and calculate its dry weight according to moisture regain to be 19.29g. Add deionized water to make the nanocellulose solid mass percentage concentration 0.5%, and soak for 12 hours to fully wet the nanocellulose. Put the hardwood xylan into deionized water, stir at room temperature, filter to remove soluble salts and impurities, and dry the refined and purified hardwood xylan for later use.

[0026] Put 0.965g (5% of the amount of nanocellulose) of Birchwood hardwood xylan from Sigma Aldrich into a container, and heat at 60°C for 0.5h to fully dissolve the hardwood xylan. Add the soaked and wetted nanocellulose into the hardwood xylan solution, and disperse it in an ultrasonic wave. The frequen...

Embodiment 2

[0034] A method of hydrophobizing modification of ramie nanocellulose is as follows:

[0035]The ramie nanocellulose is put into a container with a sealing ring to balance moisture, and the moisture regain of the nanocellulose is determined to be 9.1%. Weigh 21.10 g of nanocellulose, and calculate its dry weight according to moisture regain to be 19.18 g. Add deionized water to make the mass percent concentration 3%, and soak for 48 hours to fully wet the nanocellulose. Put the hardwood xylan into deionized water, stir at room temperature, filter to remove soluble salts and impurities, and dry the refined and purified hardwood xylan for later use.

[0036] Put 4.795 g (25% of the amount of nanocellulose) of Oat spelt hardwood xylan from Sigma Aldrich into a container, and heat at 95° C. for 3 hours to fully dissolve the hardwood xylan. Add the soaked and wetted nanocellulose into the hardwood xylan solution, and disperse it in an ultrasonic wave. The frequency of ultrasonic ...

Embodiment 3

[0045] A method of hydrophobizing modification of ramie nanocellulose is as follows:

[0046] The ramie nanocellulose is put into a container with a sealing ring to balance moisture, and the moisture regain of the nanocellulose is determined to be 8.9%. Weigh 21.00g of nanocellulose, and calculate its dry weight according to moisture regain to be 19.13g. Add deionized water to make the mass percent concentration 2%, and soak for 24 hours to fully wet the nanocellulose. Put the hardwood xylan into deionized water, stir at room temperature, filter to remove soluble salts and impurities, and dry the refined and purified hardwood xylan for later use.

[0047] Put 1.913g (10% of the amount of nanocellulose) of beachwood hardwood xylan from Sigma Aldrich into a container, and heat at 75° C. for 2 hours to fully dissolve the hardwood xylan. Add the soaked and wetted nanocellulose into the hardwood xylan solution, and disperse it in an ultrasonic wave. The frequency of the ultrasoni...

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Abstract

The invention provides a hydrophobization modification method for ramie nano cellulose. The method comprises the steps of preprocessing ramie nano cellulose and xylan, then carrying out modification reaction on the ramie nano cellulose and xylan, adding the soaked and wetted ramie nano cellulose into a hardwood xylan solution, putting into ultrasonic and dispersing, stirring by a machine, layering the mixture by centrifuging, transferring the upper layer clear liquor, and molding the left concentrated ramie nano cellulose suspension liquid through liquid nitrogen vacuum freeze drying so as to obtain the dehydrated modified ramie nano cellulose. Dehydrated modification is carried out on the ramie nano cellulose by using the acetylation of the hardwood xylan, so that the polarity and hydrophilia of plant fiber are lowered, the agglomeration of nano cellulose is inhibited, and the interfacial compatibility and cohesiveness of the ramie nano cellulose and the hydrophobic resin are improved. The method is simple and efficient, has good repeatability, has environment-friendly processes, uses the environment-friendly modification reagents, and has great scientific significance and considerable application prospect.

Description

technical field [0001] The invention relates to a method for hydrophobizing and modifying ramie nano-cellulose, which belongs to the technical field of comprehensive utilization of hemp fibers in the field of textiles and chemical modification of nano-cellulose in the field of composite materials. Background technique [0002] Ramie fiber is slender, light in weight, high in strength, breathable and cool, and is a textile and industrial fiber with excellent performance. The nano-scale cellulose extracted from ramie fibers has the advantages of low density, high modulus, renewable, degradable, and wide sources, and can be used as a nano-reinforcement agent for composite materials to improve the performance of materials. Adding a small amount of nanocellulose can significantly improve the mechanical properties of the polymer matrix material. However, the specific surface area of ​​nanocellulose is large, and the surface contains a large number of hydroxyl groups. The cellulos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/00
Inventor 李召岭关赛鹏张弘强张一帆郁崇文
Owner DONGHUA UNIV
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