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Preparation method for new type fully-degradable cellulose composite fiber with skin-core structures

A composite fiber and skin-core structure technology, applied in the direction of cellulose/protein conjugated artificial filament, chemical post-treatment of cellulose/protein artificial filament, fiber treatment, etc., can solve the problem that cellulose is difficult to dissolve and limit strong polarity Problems such as the development of the polymer industry, to achieve good moisture absorption, large market potential, and comfortable wearing effects

Inactive Publication Date: 2015-05-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the cellulose macromolecular structure is regular, and there are a lot of hydrogen bonds between molecules and molecules. This high crystallinity and strong hydrogen bond force have a great impact on the physical and chemical properties of cellulose molecules, making cellulose difficult to dissolve. In ordinary solvents, fibers cannot be directly melt-spun, which greatly limits the industrial development of such strong polar polymers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing fully degradable cellulose composite fibers with a skin-core structure, the specific steps comprising:

[0023] (1) Vacuum-dry cellulose (Jiangsu Longma, M550) and PLA (NatureWorks, USA, 4032D) for 24 hours at a temperature of 70 °C and a vacuum degree of 95 Pa; the cellulose has a degree of polymerization of 550 of ordinary cotton cellulose.

[0024] (2) Add 1.5 kg vacuum-dried cellulose and 3 kg [BMIM]Cl (Shanghai Chengjie, LM1039) into a high-speed mixer and mix evenly to obtain a mixture of cellulose and ionic liquid;

[0025] (3) Add the mixture of cellulose and ionic liquid to one feeding port of the co-rotating twin-screw extruder, and add 1.5 kg of vacuum-dried PLA to the other feeding port. For extrusion, the extrusion temperature of each segment of the skin layer cellulose and ionic liquid mixture was set to 120°C, 120°C, 130°C, 130°C, 140°C and 150°C, and the extrusion temperature of each segment of the core PLA was set to 120°C. ℃, 1...

Embodiment 2

[0027] A method for preparing fully degradable cellulose composite fibers with a skin-core structure, the specific steps comprising:

[0028] (1) Vacuum-dry cellulose (Jiangsu Longma, M550) and PBS (Arkema, France, TH-88) for 24 hours at a temperature of 60 °C and a vacuum of 100 Pa; the cellulose is polymerized Ordinary cotton cellulose with a strength of 550;

[0029] (2) Add 1.5 kg vacuum-dried cellulose and 4.5 kg [EMIM]Ac (Shanghai Chengjie, LM1132) into a high-speed mixer and mix evenly to obtain a mixture of cellulose and ionic liquid;

[0030] (3) Add the mixture of cellulose and ionic liquid to one feeding port of the co-rotating twin-screw extruder, add 1 kg of vacuum-dried PBS to the other feeding port, and mix the two together through the co-rotating twin-screw extruder. For extrusion, the extrusion temperature of each section of the mixture of cellulose and ionic liquid in the skin layer was set to 100°C, 100°C, 110°C, 110°C, 120°C and 120°C, and the extrusion te...

Embodiment 3

[0032] (1) Vacuum-dry cellulose (Jiangsu Longma, M500) and PHBV (Ningbo Tianan, ENMAT-Y1000) for 12 hours at a temperature of 60 °C and a vacuum degree of 125 Pa; the degree of polymerization of the cellulose is 500 plain cotton cellulose;

[0033] (2) Add 1.5 kg vacuum-dried cellulose and 4.5 kg [BMIM]Cl (Shanghai Chengjie, LM1039) into a high-speed mixer and mix evenly to obtain a mixture of cellulose and ionic liquid;

[0034](3) Add the mixture of cellulose and ionic liquid to one feeding port of the co-rotating twin-screw extruder, add 3kg of vacuum-dried PHBV to the other feeding port, and extrude the two through the co-rotating twin-screw extruder. The extrusion temperature of each segment of the skin layer cellulose and ionic liquid mixture was set to 120 ° C, 120 ° C, 130 ° C, 130 ° C, 140 ° C and 140 ° C, and the extrusion temperature of each segment of the core layer PHBV was set to 120 ° C , 140°C, 160°C, 180°C, 180°C and 180°C, the screw speed is 300rpm, after be...

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Abstract

The invention provides a preparation method for new type fully-degradable cellulose composite fiber with skin-core structures. The preparation method is characterized by comprising steps: cellulose and biomass polyesters are subjected to vacuum drying, the cellulose and ionic liquids are added in a high-speed mixer according to the ratio and stirred evenly, the mixture of the cellulose and the ionic liquids is added in a co-rotating twin-screw extruder through a feeding inlet, the biomass polyesters obtained from the first step are added through another feeding inlet, both of the mixture and the biomass polyesters are extruded by the co-rotating twin-screw extruder into a spinning pack to be spun through spinneret plates, the obtained composite fiber goes through a water tank and the ionic liquids in skin layers are washed off, then the composite fiber is stretched and wound through the spinning pack, and the new-type fully-degradable cellulose composite fiber with skin-core structures is obtained. The composite fiber has advantages of good hygroscopicity, comfortableness and chromaticity of cellulose and good mechanical properties of polylactic acid, and retains the biodegradable characters of cellulose and polylactic acid, and is suitable for the medical and taking fields.

Description

technical field [0001] The invention belongs to the field of novel green processing of polymer materials, and relates to a preparation method of fully degradable cellulose composite fiber with a skin-core structure. Background technique [0002] Under the background of increasingly tense petroleum resources and increasingly serious environmental pollution problems, in order to reduce the consumption of limited petroleum by various traditional petroleum-based fibers, cellulose is gradually highlighting its strong economic value and social significance. As an excellent substitute for traditional petroleum-based fibers, cellulose fibers have excellent hygroscopicity, dyeability, drapability and antistatic properties. However, cellulose has lower strength and lower toughness. According to different uses and environmental conditions, further in-depth research on composite spinning has become one of the important ways to modify chemical fibers. Among them, the composite fiber wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/02D01F8/14D01F11/02D01F11/08D01D5/34D01D5/06
Inventor 余木火张玥李欣达李海峰黎欢钟璇韩克清
Owner DONGHUA UNIV
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