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Method for preparing fluorine-containing n-substituted polyurethane superhydrophobic and superoleophobic film by electrospinning technology

An electrospinning technology, super-hydrophobic and super-oleophobic technology, applied in the direction of textiles, papermaking, non-woven fabrics, etc., to achieve the effect of strong waterproof and oil-proof performance

Active Publication Date: 2016-06-08
东莞市创进塑胶五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there is no report on the polyurethane superhydrophobic and superoleophobic film in which the hydrogen on the N position is replaced by a fluorine-containing group

Method used

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  • Method for preparing fluorine-containing n-substituted polyurethane superhydrophobic and superoleophobic film by electrospinning technology
  • Method for preparing fluorine-containing n-substituted polyurethane superhydrophobic and superoleophobic film by electrospinning technology
  • Method for preparing fluorine-containing n-substituted polyurethane superhydrophobic and superoleophobic film by electrospinning technology

Examples

Experimental program
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Effect test

preparation example Construction

[0042] 1. Preparation of polyurethane:

[0043] 1) Synthesis of prepolymer

[0044] The reactor is equipped with stirring (magnet), dropping funnel and nitrogen inlet and outlet. Weigh 10.0g of diphenylmethane diisocyanate (MDI) into a three-necked flask, and add 100ml of anhydrous N,N-dimethylformamide (DMF), stirring to completely dissolve the MDI at room temperature. Nitrogen gas was introduced, and 8.0 g of polypropylene glycol (PPG400) was weighed and slowly dropped into the three-necked flask through the dropping funnel, and the temperature was raised to 70-80°C. After the dropwise addition, continue to react at 70-80°C for 4h. The progress of the reaction was tracked and monitored by infrared spectroscopy. When the intensity of isocyanate group (CNO) dropped to half, the prepolymerization reaction ended.

[0045] 2) Chain extension reaction

[0046] After the isocyanate group-terminated prepolymer is prepared, 1.8 g of chain extender 1,4-butanediol (BDO) is slowly a...

Embodiment 1

[0069] Take the synthetic fluorine-containing N-substituted polyurethane (PU-C 8 f 17 ) 1.0g was dissolved in 1.9g anhydrous N,N-dimethylformamide / 3.8g tetrahydrofuran (1 / 2; w / w) mixed solvent to prepare a spinning dope with a mass fraction of 15wt%, named as PU -C 8 f 17 -15. to PU-C 8 f 17 -15 for electrospinning to obtain a fluorine-containing N-substituted polyurethane superhydrophobic and superoleophobic film; specifically: put the spinning stock solution in a 5mL syringe, add a spinneret with an inner diameter of 0.3mm, and push the syringe pump The rate is 0.5mL / h, the spinning voltage is 20kV, the receiving distance is 15cm, the ambient temperature is 25±2°C, and the relative humidity is 40±5%; the receiving device is a flat ground conductor, a flat glass plate or woven cloth Cover it as the base of the spinning film. The PU-C obtained in this embodiment 8 f 17 SEM image of -15 electrospun film Image 6 shown. The PU-C obtained in this embodiment 8 f 17 Th...

Embodiment 2

[0071] Take the synthetic fluorine-containing N-substituted polyurethane (PU-C 8 f 17 ) 1.0g was dissolved in 1.3g anhydrous N,N-dimethylformamide / 2.6g tetrahydrofuran (1 / 2; w / w) mixed solvent to prepare a spinning dope with a mass fraction of 20wt%, named as PU -C 8 f 17 -20. to PU-C 8 f 17 -20 for electrospinning to obtain a fluorine-containing N-substituted polyurethane superhydrophobic and superoleophobic film; specifically: put the spinning stock solution in a 5mL syringe, add a spinneret with an inner diameter of 0.3mm, and push the syringe pump The rate is 0.5mL / h, the spinning voltage is 20kV, the receiving distance is 15cm, the ambient temperature is 25±2°C, and the relative humidity is 40±5%; the receiving device is a flat ground conductor, a flat glass plate or woven cloth Cover it as the base of the spinning film. The PU-C obtained in this embodiment 8 f 17 SEM image of -20 electrospun film Figure 7 shown. The PU-C obtained in this embodiment 8 f 17 T...

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Abstract

The invention discloses a method for preparing a fluorine-contained N-position-substituted polyurethane super-hydrophobic and super-oleophobic thin film through the electrospinning technology, and relates to the technical field of high polymer materials and preparation methods of high polymer materials. The method includes the steps of firstly, synthesizing prepolymer; secondly, conducting the chain-extension reaction; thirdly, generating polyanion; fourthly, preparing fluorine-contained N-position-substituted polyurethane; fifthly, preparing the polymer electrospinning thin film. On the basis of traditional polyurethane, the hydrogen in the N position is substituted with a fluorine-contained monomer, the N-position-substituted polyurethane is synthesized, the N-position-substituted polyurethane super-hydrophobic and super-oleophobic thin film is prepared through the electrospinning method, the water contact angle of the thin film can reach as high as 160 degrees, and the oil contact angle can reach as high as 154 degrees. The multi-carbon fluorine-contained group of the related fluorine-contained polyurethane is directly connected with nitrogen atoms, and the thin film made of the substance has the ultra-high waterproof and oil-proof performance and the self-cleaning capacity.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a fluorine-containing N-substituted polyurethane superhydrophobic and superoleophobic film through an electrospinning technique. Background technique [0002] Due to the superhydrophobic and superoleophobic properties of superamphiphobic materials, it has great application potential in green buildings, liquid waterproof materials, bioseparation, water purification, tissue engineering and microsystems, etc., which has attracted more and more attention. more and more attention. Two different theoretical models (Wenzel and Cassie-Baxter) have been proposed to explain surface wettability. According to the Cassie-Baxter model, the formation of superamphiphobic (superhydrophobic and superoleophobic) surfaces is mainly attributed to rough surfaces with low surface free energy. The prior art has disclosed a variety of research methods on the preparation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728C08G18/76C08G18/48C08G18/32C08G18/83
Inventor 刘利彬党钊王彦彦乔从德李天铎徐金库
Owner 东莞市创进塑胶五金有限公司