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A kind of modified nano-microcrystalline cellulose composite chitosan fiber and its preparation method

A technology of composite chitosan and chitosan fiber, which is applied in the direction of cellulose/protein conjugated artificial filament, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of uneven distribution and reduce fiber unevenness, etc. Achieve the effect of reducing fiber strength unevenness, improving mechanical properties and good compatibility

Active Publication Date: 2021-10-26
JIAXING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) To overcome the problem of agglomeration and uneven distribution of nano-microcrystalline cellulose inside the chitosan / nano-microcrystalline cellulose composite fiber, and reduce fiber unevenness;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Includes the following steps:

[0051] (1) Preparation modified nano-microcrystalline cellulose

[0052] The nanophyla cellulose is added to the reaction kettle containing sodium hydroxide, ethanol, and water, reacted at a certain temperature, stirring conditions, and is an alkalized nanocrystalline cellulose.

[0053] The nanocrystalline cellulose has a diameter of 30 nm and a length of 1.5 μm.

[0054] The mass ratio of ethanol and water is 0.7: 1, the total mass fraction of sodium hydroxide and water is 15%, and the nano-microcrystalline cellulose accounts for sodium hydroxide, ethanol, and the total mass fraction of the sum of water is 8%. .

[0055] The reaction temperature was 20 ° C, the stirring speed was 200 Hz, and the reaction time was 0.7 hours.

[0056] In steps Isopropanol is added to the reactor, the mass ratio of isopropyl alcohol with nano-microcrystalline is 0.: 1, and the reaction temperature is increased to 74 ° C, and the reaction is continued for ...

Embodiment 2

[0076] Includes the following steps:

[0077] (1) Preparation modified nano-microcrystalline cellulose

[0078] The nanophyla cellulose is added to the reaction kettle containing sodium hydroxide, ethanol, and water, reacted at a certain temperature, stirring conditions, and is an alkalized nanocrystalline cellulose.

[0079] The nanocrystalline cellulose has a diameter of 5 nm, and the length is 0.3 μm.

[0080] The mass ratio of ethanol and water is 1, and sodium hydroxide accounts for 10% of the total mass fraction of ethanol and water, and nano-microcrystalline cellulose accounts for sodium hydroxide, ethanol, and the total mass fraction of water is 10%. .

[0081] The reaction temperature was 15 ° C, the stirring speed was 150 Hz, and the reaction time was 0.5 hours.

[0082] In steps Isopropanol is added to the reactor, the mass ratio of isopropyl alcohol with nano-microcrystalline is 0.5.5.5, raised at elevated reaction temperatures to 70 ° C, and the reaction is conti...

Embodiment 3

[0104] Includes the following steps:

[0105] (1) Preparation modified nano-microcrystalline cellulose

[0106] The nanophyla cellulose is added to the reaction kettle containing sodium hydroxide, ethanol, and water, reacted at a certain temperature, stirring conditions, and is an alkalized nanocrystalline cellulose.

[0107] The nanocrystalline cellulose has a diameter of 50 nm and a length of 3 μm.

[0108] The mass ratio of ethanol and water is 0.5.5.5.5%, the total mass fraction of sodium hydroxide is 20%, and nano-microcrystalline cellulose accounts for sodium hydroxide, ethanol, and the total mass fraction of water is 5%. .

[0109] The reaction temperature was 25 ° C, the stirring speed was 300 Hz, and the reaction time was 1 hour.

[0110] In steps Isopropanol is added to the reaction kettle, and the mass ratio of isopropanol and nanocrystalline cellulose is 1, and the reaction temperature is increased to 80 ° C, and the reaction is continued for 10 minutes. After coo...

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Abstract

The invention provides a modified nano-microcrystalline cellulose composite chitosan fiber, the composite chitosan fiber is composed of a chitosan fiber matrix and modified nano-microcrystalline cellulose distributed in the fiber matrix; the modified The mass fraction of nano-microcrystalline cellulose in the composite fiber is 3-10%. The present invention also provides a preparation method of the above-mentioned composite chitosan fiber. The preparation method of the chitosan composite fiber provided by the present invention can be produced by relying on a conventional chitosan fiber production line, and the method is simple and low in cost. The chitosan composite fiber prepared by the present invention is entirely composed of chitosan and cellulose, both of which belong to polysaccharides and have good compatibility; there is an ionic interaction between the modified nano-microcrystalline cellulose and the chitosan molecular chain, The mixed solution has a certain gelation phenomenon, the viscosity of the system increases, and it can withstand multiple drafts of the coagulation bath and plasticizing bath, effectively improving the mechanical properties of the composite fiber.

Description

Technical field [0001] The present invention belongs to the field of functional fibers, and involves a modified nanocrystalline cellulose composite chitosan fiber and a preparation method thereof. Background technique [0002] Chitosan from the animal resources such as shrimp, crab shell, the molecular formula is β- (1 → 4) -2-amino-2-deoxidation-D-glucose, is a natural polymer material having essential antibacterial properties. There are many kinds of chitosan products, widely used in pharmaceutical, food, chemicals and other fields. Among them, the chitosan fibers can be prepared by wet spinning method, but the mechanical properties of chitosan fibers are not ideal (the dry state breakage intensity is less than 1.8 Cn / DTEX), which affects the processing and use of the fibers. The reason is that the chitosan glow liquid is directly entering the spray blowing port directly into the solidification bath, the tensile tension is smaller, and the chitosan molecular chain in which no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/18D01F8/02
Inventor 姚勇波王东兴王乐军范磊刘怡宁陈思
Owner JIAXING UNIV
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