Method for preparing polymeric nano-micro fiber non-woven fabric

A non-woven fabric, polymer technology, applied in non-woven fabrics, textiles and papermaking, spinning solution preparation and other directions, can solve the problem of not having universal applicability, and achieve the requirements of overcoming thermoplasticity and high melt fluidity, Excellent performance and simple process

Active Publication Date: 2011-05-25
上海榕融新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited solubility of amine oxide solvents, which can only dissolve a few polymers such as cellulose, this method is not universally applicable

Method used

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  • Method for preparing polymeric nano-micro fiber non-woven fabric
  • Method for preparing polymeric nano-micro fiber non-woven fabric
  • Method for preparing polymeric nano-micro fiber non-woven fabric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Polyurethane with an average molecular weight (Mw) of 280,000 is dissolved in N,N-dimethylformamide at a ratio of 12% by mass fraction, stirred until uniformly mixed to make a spinning solution, and the viscosity of the spinning solution is 25 4300mP·s at ℃. The spinning solution is supplied to the spinneret 2 through the delivery pipe through the metering pump, and the supply rate is 200mL / min. The spinning solution is extruded from the spinneret hole 21 under the pressure of the pump, and is sprayed out through the air gap 22. The high-speed jet stream is drafted and refined, and the high-speed jet stream is provided by an air compressor, the outlet pressure (jet pressure) of the air gap 22 is set to 0.6 MPa, and the temperature is room temperature. The high-speed airflow stretches the thin stream of spinning solution, the solvent volatilizes to form nanofibers, and the nanofibers are collected on the metal mesh curtain 4 under the action of high-speed jet airflow and...

Embodiment 2

[0033] Dissolve polyacrylonitrile with an average molecular weight (Mw) of 350,000 into N,N-dimethylformamide at a mass fraction of 20%, and stir until it is evenly mixed to make a spinning solution. The viscosity of the solution is at 30°C The lower is 14900mP·s. The spinning solution is supplied to the spinneret 2 through the delivery pipe through the gear pump, and the supply rate is 300mL / min. The spinning solution is squeezed out from the spinneret hole 21 under the pressure of the pump, and is sprayed out through the air gap 22. The high-speed jet airflow is stretched, the high-speed airflow injection pressure is set at 1.2MPa, and the temperature is 35°C. The high-speed jet airflow stretches the thin stream of spinning solution, and the solvent volatilizes to form nanofibers, which are collected on the nylon mesh curtain 4 under the action of the high-speed jet airflow and suction airflow, and then the polymer nanofiber nonwoven fabric is made.

[0034] Utilize the obt...

Embodiment 3

[0036] Poly(ethylene oxide) with an average molecular weight (Mw) of 300,000 was dissolved in deionized water at a ratio of 8% by mass fraction, and silver nitrate (AgNO 3 ), and stirred until uniformly mixed to prepare a spinning solution, the viscosity of which was 1800mP·s at 50°C. The spinning solution is supplied to the spinneret 2 through a delivery pipe through a peristaltic pump, and the supply rate is 10 mL / min. The spinning solution is squeezed out from the spinneret hole 21 under the pressure of the pump, and is sprayed out through the air gap 22 The high-speed jet flow is stretched, the high-speed jet flow is provided by the air compressor, the jet pressure at the outlet of the air gap is set at 2.6MPa, and the temperature is 55°C. The high-speed jet airflow stretches the thin stream of the spinning solution, and the solvent volatilizes to form nanofibers. + ) polymer nano-microfiber nonwoven fabric, can obtain nano-microfiber nonwoven fabric containing nano-silve...

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Abstract

The invention discloses a method for preparing a polymeric nano-micro fiber non-woven fabric. The method comprises the following steps of: firstly, dissolving at least one polymer in at least one solvent to prepare spinning solution; then supplying the spinning solution to a spinneret plate with a series of spinneret orifices so as to make the spinning solution extruded from the spinneret orifices of the spinneret plate to form a trickle of the spinning solution; secondly, stretching and refining the trickle of the spinning solution by utilizing at least one high-speed jet airflow, and accelerating the volatilization of the solvent to form nano-micro fiber; and finally, collecting the nano-micro fiber on a web curtain by utilizing high-speed airflow and suction airflow. The polymer is a fiber-forming polymer; the solvent can dissolve the fiber-forming polymer and has the volatility; a jet angle of the high-speed airflow is between 15 and 60 degrees, and the jet velocity is at least 50 times higher than extrusion speed of the trickle of the spinning solution; the mass concentration of the polymer in the spinning solution is between 2 and 50 percent; and the viscosity of the spinning solution at a spinning temperature is between 10 and 100, 000mP.s.

Description

technical field [0001] The invention relates to a technology for preparing nano-microfibers, in particular to a method for directly preparing polymer nano-microfiber non-woven fabrics by using a polymer spinning solution through high-speed air jet injection. Background technique [0002] Nanofibers generally refer to ultrafine fibers with a diameter of less than 5 microns or even nanometers. Due to the advantages of small diameter and large specific surface area, nanofibers are considered to be a high-performance, high-value-added fiber product, and are used in filter materials, thermal insulation materials, oil-absorbing materials, medical and sanitary materials, battery separators, and sound insulation materials. There is a growing demand for nanofibers and nonwoven fabrics made from nanofibers. [0003] The meltblown method is the most commercialized and scaled nanofiber nonwoven fabric manufacturing method, and there are many related patent technical documents. Represe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/00D01D1/02D01D5/04D04H5/08
Inventor 庄旭品程博闻关克田康卫民焦晓宁
Owner 上海榕融新材料技术有限公司
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