Method for enhancing electrostatic spinning nanofiber membrane

A nanofiber membrane and nanofiber technology, applied in electrospinning, fiber processing, textiles and papermaking, etc., can solve the problem that the strength of electrospun membranes does not increase substantially, does not have universal applicability, and fibers cannot be effectively bonded, etc. problems, to achieve the effect of meeting the requirements of low-carbon production, improving the overall mechanical properties, and facilitating industrialization

Active Publication Date: 2014-01-29
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) Reinforced by the base fabric or compounded with other materials. For example, in the patent application number 201010113456.0, the mesh cloth is used to cover the receiving electrode, so that the electrospun nanofiber is combined with the mesh cloth to enhance the strength of the electrospun membrane; another example is the application number: In the patent of 201310036655.X, electrospun membranes and needle-punched/spunlace non-woven fabrics are hot-rolled and composited to prepare reinforced composite nanofiber materials. This method uses materials with higher strength to overcome the low strength of electrospun nanofiber membranes. However, increasing the thickness of the film and introducing unnecessary other polymer components restricts its application in many fields;
[0007] (3) Electrospinning with high-performance polymers: For example, in the patent application number 201010501343.8, polyamic acid is used for electrospinning, and the polyimide film prepared by thermal imidization has a strength of up to 24MPa, which is This method is only limited to specific polymers and does not have universal applicability;
[0009] (5) Miscible electrospinning - hot (melt) treatment: Gao Kun's research also found that the mi

Method used

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  • Method for enhancing electrostatic spinning nanofiber membrane
  • Method for enhancing electrostatic spinning nanofiber membrane
  • Method for enhancing electrostatic spinning nanofiber membrane

Examples

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Embodiment 1

[0053] PAN and 21216 PVDF produced by Solvay were used as two polymers for mixed electrospinning. Among them, PAN, as a high-melting point component, can still maintain thermal stability at 220 °C. The nanofiber membrane obtained by electrospinning has a large tensile modulus after hot rolling, but the elongation at break and the strength at break are low ( see Figure 14 ); PVDF21216 is a thermoplastic low-melting polymer component with a melting point of 135°C and an initial melting temperature of 110°C. The tensile modulus of the fiber membrane obtained by its single-component electrospinning is small, but the elongation at break and the strength at break are relatively large (see Figure 12 ).

[0054] Pre-dried PAN and PVDF21216 under the condition of 80 for 2 hours, weighed PAN and solvent according to the mass fraction ratio of PAN / acetone / DMF=15 / 20 / 65, weighed according to PVDF21216 / acetone / DMF=10 / 20 / 70 Take PVDF21216 and solvent, and dissolve it with magnetic stirrin...

Embodiment 2

[0059] The 6020 and 21216 PVDF thermoplastic polymers produced by Solvay in the United States were used as the two components of the solution electrospinning mixed spinning. As a high melting point component, PVDF6020 has a melting point of 175°C, and the fiber membrane obtained by electrospinning has relatively high breaking strength and moderate elongation at break; PVDF21216, as a low melting point component, has a melting point of 135°C and an initial melting temperature of 106°C. The tensile modulus of the fiber membrane obtained by electrospinning is small, but the elongation at break is large (see Figure 12 with 15 ).

[0060] Pre-dry PVDF6020 and PVDF21216 at 80°C for 2 hours, weigh PVDF6020 and solvent according to the mass fraction ratio of PVDF6020 / acetone / DMF=10 / 20 / 70, and weigh according to PVDF21216 / acetone / DMF=10 / 20 / 70 Take PVDF and solvent, stir and dissolve at 45°C until a transparent mixed solution is formed, and cool to room temperature to obtain PVDF6020...

Embodiment 3

[0065] The 6020 and 21216 PVDF thermoplastic polymers produced by Solvay in the United States were used as the two components of the melt electrospinning mixed spinning. As a high melting point component, PVDF6020 has a melting point of 175°C, and the fiber membrane obtained by electrospinning has relatively high breaking strength and moderate elongation at break; PVDF21216, as a low melting point component, has a melting point of 135°C and an initial melting temperature of 106°C. The fiber membrane obtained by electrospinning has a smaller tensile modulus, but a larger elongation at break.

[0066] Pre-dry PVDF6020 and PVDF21216 at 80°C for 2 hours to obtain dry polymers of PVDF6020 and PVDF21216. Two rows of spinneret holes are staggered (see figure 1 : figure 1 Four rows of spinning needles or spinneret holes are shown; this example uses a meltblown device with two rows of spinneret holes) for hybrid electrospinning. The spinning plate is grounded, the web curtain is mad...

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Abstract

The invention discloses a method for enhancing an electrostatic spinning nanofiber membrane. The blending electrostatic spinning-hot rolling bonding net fixing technology which can effectively improve the strength of the electrostatic spinning nanofiber membrane is provided. The method for enhancing the electrostatic spinning nanofiber membrane is characterized in that interphase blending electrostatic spinning is conducted through multiple types of thermoplastic high polymers with the fusion point at least 20 DEG C lower than that of other components or low-fusion-point thermoplastic high polymers and non-thermoplastic high polymers, electrostatic spinning jet flows of the components are distributed frontwards and backwards in the moving direction of a receiving device, and fibers are distributed randomly in a staggered mode; after hot rolling is conducted on a blending electrostatic spinning fiber membrane, the blending electrostatic spinning fiber membrane is treated, the hot pressing temperature is slightly higher than the fusion starting temperature of the low-fusion-point thermoplastic high polymers, time ranges from 1min to 10min, the pressure ranges from 1MPa to 20MPa, after hot pressing is conducted, part of the low-fusion-point thermoplastic high polymers is fused, point adhesion is generated on the nanofiber intersection portions, and a hole is not blocked. The method for enhancing the electrostatic spinning nanofiber membrane has the advantages that the strength of the prepared enhanced electrostatic spinning nanofiber membrane is far higher than that of a common electrostatic spinning membrane and original good performance of the electrostatic spinning nanofiber membrane can be kept.

Description

technical field [0001] The invention relates to a reinforcement technology of electrospinning nanofiber membranes, in particular to a method for enhancing point bonding between nanofibers by mixing low-melting thermoplastic polymers for electrospinning and then hot rolling. Background technique [0002] Electrospinning technology is a technology that uses electrostatic field force to produce nanofiber materials, which has been widely and deeply researched at home and abroad in recent years. Nanofiber nonwovens / membranes (electrospun membranes) prepared by electrospinning technology have many excellent properties, such as strong selectivity of polymer raw materials, and solution and / or melt electrospinning can be performed for different types of raw materials; the obtained electrospun The membrane has high porosity, small pore size and uniform distribution, adjustable fiber fineness, controllable film thickness, and has the advantages of isotropy, high filtration efficiency, ...

Claims

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Application Information

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IPC IPC(8): D04H1/541D04H1/558D04H1/728
CPCD04H1/728D01D5/003D01D5/0069
Inventor 刘延波漆东岳马营陈威亚
Owner TIANJIN POLYTECHNIC UNIV
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