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A kind of superhydrophobic nanofiber, fiber membrane and its preparation and application

A nanofiber membrane and nanofiber technology, which is applied in fiber types, fiber treatment, animal fibers, etc., can solve problems such as effective construction of difficult surface rough structures, nanoparticle embedding, and flux to be improved.

Active Publication Date: 2020-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is prone to the problems that most of the nanoparticles are embedded inside the nanofibers, which makes it difficult to effectively construct a rough surface structure and obtain a superhydrophobic fiber membrane; although blindly increasing the content of material nanoparticles can improve the surface to a certain extent Roughness, however, on the one hand, the high concentration of nanoparticles increases the cost, on the other hand, the high concentration of nanoparticles tends to form large clumps inside the fiber, which will reduce the performance of the material and reduce the elasticity and mechanical properties of the fiber membrane
[0006] In order to solve the problem of nanoparticle embedding in electrospun membranes, some improved methods such as sol-gel method and layer-by-layer assembly method have been reported in the prior art. Although these methods can improve the problem of nanoparticle embedding to a certain extent, However, the operation process of multi-step reaction and classification is complicated; it is difficult for real industrial application, not only that, but its hydrophobicity is still difficult to meet the superhydrophobic standard, and the flux needs to be improved

Method used

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  • A kind of superhydrophobic nanofiber, fiber membrane and its preparation and application
  • A kind of superhydrophobic nanofiber, fiber membrane and its preparation and application
  • A kind of superhydrophobic nanofiber, fiber membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] ① Preparation of electrostatic spinning liquid and electrostatic spray liquid

[0085] Electrospinning solution adopts polyvinylidene fluoride (PVDF6020), additive polyvinylpyrrolidone (PVP), solvent N, N-dimethylformamide (DMAc) three kinds of materials by weight percentage 12wt%, 8wt%, 80wt% in 60 Mix and stir evenly at ℃; the spray liquid uses polyvinylidene fluoride (PVDF6020), additive silica nanoparticles (SiO 2 ), the solvent N, N-dimethylacetamide (DMAc) three substances are mixed and stirred evenly at 60 ° C by weight percentage 4wt%, 8wt%, 88wt%;

[0086] ② Spinning of porous fiber membrane

[0087] The electrospinning liquid and the electrostatic spray liquid are sprayed together from the two spinnerets respectively. After the two spinnerets pass through the air gap height of 10cm, they are collected at a rate of 300r / min under a high-voltage 8.88kv DC electric field. On the aluminum foil paper of the rotating drum, the flow rate of the electrospinning liqu...

Embodiment 2

[0093] Compared with Example 1, adjust the proportioning of each substance in the electrostatic spray liquid, specifically as follows:

[0094] ① Preparation of electrostatic spinning liquid and electrostatic spray liquid

[0095] Electrospinning solution adopts polyvinylidene fluoride (PVDF6020), additive polyvinylpyrrolidone (PVP), solvent N, N-dimethylformamide (DMAc) three kinds of materials by weight percentage 12wt%, 8wt%, 80wt% in 60 Mix and stir evenly at ℃; the spray liquid uses polyvinylidene fluoride (PVDF6020), additive silica nanoparticles (SiO 2 ), the solvent N, N-dimethylacetamide (DMAc) three substances are mixed and stirred evenly at 60 ° C by weight percentage 4wt%, 4wt%, 92wt%;

[0096] ② Spinning of porous fiber electrospun fiber membrane

[0097] The electrospinning liquid and the electrostatic spray liquid are sprayed together from the two spinnerets respectively. After the two spinnerets pass through the air gap height of 10cm, they are collected at a...

Embodiment 3

[0103] ① Preparation of electrostatic spinning liquid and electrostatic spray liquid

[0104] Electrospinning solution adopts polyvinylidene fluoride (PVDF6020), additive polyvinylpyrrolidone (PVP), solvent N, N-dimethylformamide (DMAc) three kinds of materials by weight percentage 12wt%, 5wt%, 83wt% in 60 Mix and stir evenly at ℃; the spray liquid uses polyvinylidene fluoride (PVDF6020), additive silica nanoparticles (SiO 2 ), the solvent N, N-dimethylacetamide (DMAc) three substances are mixed and stirred evenly at 60 ° C by weight percentage 4wt%, 2wt%, 94wt%;

[0105] ② Spinning of porous fiber electrospun fiber membrane

[0106] The electrospinning liquid and the electrostatic spray liquid are sprayed together from the two spinnerets respectively. After the two spinnerets pass through the air gap height of 10cm, they are collected at a rate of 300r / min under a high-voltage 8.88kv DC electric field. On the aluminum foil paper of the rotating drum, the flow rate of the el...

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Abstract

The invention belongs to the technical field of oil-water separation, and particularly relates to super-hydrophobic nanofiber with a graded coarseness structure. The super-hydrophobic nanofiber comprises a PVDF fiber substrate with corrosion debosses and hydrophobic particles composited on the surface of the PVDF fiber substrate, and the hydrophobic particles are PVDF coated nanoparticles. The invention provides a super-hydrophobic porous nano fibrous membrane containing the nanofiber and a preparation method thereof. The fibrous membrane is a super-hydrophobic membrane and is high in adsorption flux.

Description

technical field [0001] The invention belongs to the field of preparation and application of electrospun fiber membranes, in particular to a preparation method and application of a porous nanofiber membrane with graded roughness structure for oil-water separation [0002] technical background [0003] Oil spills and oily wastewater have posed serious threats to freshwater resources and have attracted great attention from industry and academia. Use hydrophobic membrane materials, especially if the contact angle is greater than 150 0 The super-hydrophobic membrane material is an effective means of oil-water separation. [0004] Based on the Cassie-Baxter equation theory, the current main idea for the preparation of superhydrophobic membranes is to construct a hydrophobic surface with a rough structure. For example: Y.Liao, R.Wang and others can complete the superhydrophobic surface modification under mild conditions through the two-step method of polydopamine coating and nano-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/50D06M15/256D06M11/79D06M11/83D04H1/4318D04H1/4382D04H1/728B01D17/022D06M101/12
CPCB01D17/0202D04H1/4318D04H1/4382D04H1/728D06M11/79D06M11/83D06M13/50D06M15/256D06M2101/22D06M2200/12
Inventor 郭辉蒋兰英
Owner CENT SOUTH UNIV