Preparation method of green and environment-friendly waterborne polyurethane nanofibers

A water-based polyurethane and nanofiber technology, applied in the direction of single-component polyurethane rayon, fiber processing, filament/thread forming, etc., to avoid harm to the human body and the environment, and to achieve good fiber formation.

Active Publication Date: 2021-06-08
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem in the prior art that high polymers that are easy to spin must be added to prepare water-based polyurethane nanofibers, the present invention discloses a method for preparing green and environmentally friendly water-based polyurethane nanofibers. The prepared water-based polyurethane can be used alone in electrospinning nanofibers

Method used

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  • Preparation method of green and environment-friendly waterborne polyurethane nanofibers
  • Preparation method of green and environment-friendly waterborne polyurethane nanofibers
  • Preparation method of green and environment-friendly waterborne polyurethane nanofibers

Examples

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Embodiment 1

[0039] (1) Preparation of water-based polyurethane spinning solution: Mix 70 parts of polypropylene oxide diol, 25 parts of isophorone diisocyanate and 5 parts of 2,2-dimethylolpropionic acid chain extender into a three-necked flask Then add 0.5 parts of organic bismuth catalyst to the three-necked flask, raise the temperature to 80-90°C, continue to react for 4-6 hours, add 5 parts of acetone for dilution, cool down to 70°C, continue stirring and add 8 parts of triethylamine to react 12 A polyurethane prepolymer was obtained after 10 minutes, and the polyurethane prepolymer was dispersed at a high speed in water with 7 parts of sulfonate chain extenders, the dispersion speed was 1000r / min, and the dispersion continued for 25 minutes to obtain a water-based polyurethane with a solid content of 25%. Spinning liquid, remove acetone under negative pressure;

[0040] (2) Preparation of water-based polyurethane nanofibers: put the water-based polyurethane spinning solution prepared...

Embodiment 2

[0043] (1) Preparation of water-based polyurethane spinning solution: Mix 60 parts of polypropylene oxide diol, 28 parts of isophorone diisocyanate and 4 parts of 2,2-dimethylolpropionic acid chain extender into a three-necked flask Then add 0.8 parts of organic bismuth catalyst to the three-necked flask, heat up to 80-90°C, react for 4-6 hours, then add 6 parts of acetone for dilution, cool down to 65°C, continue stirring and add 10 parts of triethylamine to react for 10 minutes The polyurethane prepolymer is obtained afterward, and the polyurethane prepolymer is dispersed in water with 9 parts of sulfonate chain extenders at a high speed, the dispersion speed is 1200r / min, and the dispersion is continued for 30 minutes to obtain a water-based polyurethane textile with a solid content of 30%. Silk liquid, remove acetone under negative pressure;

[0044](2) Preparation of water-based polyurethane nanofibers: put the water-based polyurethane spinning solution prepared in step (...

Embodiment 3

[0046] (1) Preparation of water-based polyurethane spinning solution: Mix 75 parts of polypropylene oxide diol, 22 parts of isophorone diisocyanate and 3 parts of chain extender into a three-necked flask, and then add 1.0 part catalyst, heat up to 80-90°C, cool down for 4-6 hours, add 6 parts of acetone to dilute, continue to stir and add 8 parts of triethylamine to react for 14 minutes to obtain a polyurethane prepolymer. After adding 10 parts of polyurethane prepolymer Carry out high-speed dispersion in water of the chain extender, the dispersion speed is 800r / min, and disperse for 20 minutes to obtain a water-based polyurethane spinning solution with a solid content of 30%, and remove acetone under negative pressure;

[0047] (2) Preparation of water-based polyurethane nanofibers: put the water-based polyurethane spinning solution prepared in step (1) into a 10 mL needle-free medical syringe, install a metal flat needle and connect it to a positive high voltage. The receive...

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Abstract

The invention discloses a preparation method of green and environment-friendly waterborne polyurethane nanofibers. The preparation method includes the following steps: mixing 50-80 parts of polypropylene oxide glycol, 10-30 parts of isophorone diisocyanate and 1-8 parts of a front chain extender; adding 0.5-1 part of a catalyst, heating to 80-90 DEG C, and reacting for 4-6 hours; then adding 3-10 parts of acetone, cooling to 50-70 DEG C, and adding 2-12 parts of triethylamine to react for 10-20 minutes to obtain a polyurethane prepolymer; dispersing the polyurethane prepolymer in water added with a post-chain extender at high speed to obtain a waterborne polyurethane spinning solution with the solid content of 15-30%; and using the waterborne polyurethane spinning solution as a raw material, and carrying out electrostatic spinning to prepare the waterborne polyurethane nanofibers. The prepared waterborne polyurethane spinning solution can be independently applied to an electrostatic spinning technology to prepare the nanofibers, and has good fiber forming property, the diameter range is 100-1500 nm, the defect that the nanofibers can be prepared from the waterborne polyurethane only by means of other spinnable high polymers is overcome, water serves as a solvent, damage of organic solvents to human bodies and the environment is avoided, and the preparation method is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of nanofibrous material preparation, and in particular relates to a method for preparing green and environment-friendly water-based polyurethane nanofibers. Background technique [0002] The electrospinning method is to place the high-molecular polymer solution in a high-voltage electric field. The polymer solution is excited by the electric field to form a jet, and the jet is stretched and thinned, and finally ultrafine fibers are obtained on the receiving screen. Nanofibers prepared by electrospinning have the advantages of small diameter, good uniformity, high specific surface area, and easy synthesis, and are widely used in high-efficiency filtration, tissue engineering, and wound dressings. [0003] Polymer molecular chains form entanglements in solution and have a certain viscosity, which is a necessary condition for the preparation of polymer fibers by electrospinning technology. When the polymer sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01F6/70
CPCD01D5/003D01D5/0061D01F6/70
Inventor 曲建波李彦春陈楠王建勇
Owner QILU UNIV OF TECH
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