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Hydrophobic film with self-cleaning function, preparation method thereof and application thereof

A hydrophobic membrane, self-cleaning technology, applied in spinning solution preparation, chemical instruments and methods, membrane technology, etc., can solve the problems of hydrophobic damage of membrane surface or membrane pores, membrane surface pollution, decreased service life, etc. The size and distribution are controllable, the effect of reducing the cost of membrane use and prolonging the service life of the membrane

Active Publication Date: 2015-10-28
YANTAI LVSHUIFU MEMBRANE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of the separation membrane, the low porosity of the membrane surface and the problem of membrane fouling become important factors affecting the performance of the membrane.
The pore diameter ratio of the separation membrane is low, and the pore diameter is too large to achieve a good separation effect; membrane fouling can easily cause clogging of the membrane pores, reducing the membrane flux and the service life of the membrane
For example, most of the air filter membranes on the market are non-woven fiber cloths with thicker diameters, usually in the micron range. The pore size is too large, and the retention rate is very low. It cannot filter atmospheric aerosol particles with a diameter less than or equal to 2.5 μm. During use, with the prolongation of the use time, the membrane surface will be polluted, the membrane flux will be reduced and the service life will be reduced; the membrane used for membrane distillation will limit the membrane flux due to the low porosity of the membrane, and it will also be used during use. Faced with serious membrane fouling problems, resulting in a decrease in membrane flux, damage to the hydrophobicity of the membrane surface or membrane pores, and reduce the salt interception rate

Method used

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  • Hydrophobic film with self-cleaning function, preparation method thereof and application thereof
  • Hydrophobic film with self-cleaning function, preparation method thereof and application thereof
  • Hydrophobic film with self-cleaning function, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1g of PE particles and dissolve them in 3mL of TFA with stirring, stir magnetically for 3 hours until all PE particles are dissolved, and let stand for 12 hours for defoaming. The above defoamed solution was electrospun at a temperature of 15°C and a relative humidity of 10%. The spinning parameters were as follows: the flow rate of the syringe pump was 1.0 mL, the flow rate was 0.5 mL / h, and the distance between the needle and the receiver was It is 8cm, the voltage is 20kv, and it is ready for use after spinning. The nano-silica sol was prepared by a sol-gel method, and the particle size was 50nm. Soak the obtained PE nanofiber membrane in the nano-sol for 1 min, take it out to dry, and soak once. Obtain the desired self-cleaning film. Example 2:

Embodiment 2

[0030]Weigh 1.5g of PE particles and dissolve them in 3mL of TFA under stirring, stir magnetically for 3.5 hours until all PE particles are dissolved, and let stand for 14 hours for defoaming. The above defoamed solution was electrospun at a temperature of 25°C and a relative humidity of 21%. The spinning parameters were as follows: the flow rate of the syringe pump was 1.0 mL, the flow rate was 0.5 mL / h, and the distance between the needle and the receiver was It is 9cm, the voltage is 20kv, and it is ready for use after spinning. The nano-alumina sol was prepared by a sol-gel method, and the particle size was 15nm. Soak the obtained PE nanofiber membrane in the nanosol for 1 min, take it out to dry, and soak twice. Obtain the desired self-cleaning film. After testing, the contact angle value of the obtained self-cleaning film to water is 144°.

Embodiment 3

[0032] Weigh 1 g of PET particles and dissolve them in 3 mL of DMF under stirring, stir magnetically for 4 hours until all PET particles are dissolved, and let stand for 14 hours for defoaming. The above defoamed solution was electrospun at a temperature of 25°C and a relative humidity of 30%. The spinning parameters were as follows: the flow rate of the syringe pump was 1.0 mL, the flow rate was 0.5 mL / h, and the distance between the needle and the receiver was It is 10cm, the voltage is 20kv, and it is ready for use after spinning. The nano-silica sol is prepared by a sol-gel method, and the particle size is 100 nm. Soak the obtained PET nanofiber membrane in the nano-sol for 1 min, take it out to dry, and soak for 3 times. Obtain the desired self-cleaning film.

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Abstract

The invention relates to a hydrophobic film, and specifically relates to a hydrophobic film with a self-cleaning function, and a preparation method thereof and an application thereof. The hydrophobic film is a polymer nanofiber film prepared through an electrospinning fiber technique, the surface of the hydrophobic film is subjected to nanocrystallization modification to improve the surface hydrophobicity, and the contact angle between the hydrophobic film and water is 140-180 DEG. According to the invention, the electrospinning fiber technique and the surface nanocrystallization technique are combined, the preparation technology is simple, and the prepared hydrophobic film has the self-cleaning function and a high porosity factor, and can be applied to fields of air purifying filters, film distillation and oil-water separation and the like.

Description

technical field [0001] The invention relates to a hydrophobic membrane, in particular to a hydrophobic membrane with self-cleaning function and its preparation method and application. Background technique [0002] Inspired by the lotus leaf effect in nature, people have developed various superhydrophobic self-cleaning surfaces, which are widely used in washing, printing and dyeing, textiles, food, packaging, architectural coatings, pipeline transportation, aerospace, sensors, and anti-fouling, anti-corrosion and anti-oxidation, membranes. field of separation. With the in-depth research on the mechanism of the "lotus leaf effect", the self-cleaning characteristics of the "lotus leaf effect" are gradually revealed to be determined by the existence of micron-structured papillae on the rough surface and the presence of hydrophobic waxy substances on the surface. In 2002, Jiang Lei's research group reported a new discovery (Lin F, Shuhong L, Yingshun L, et al. Super-hydrophobic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/42D01D1/02D01D5/00D06M11/79D06M11/46D06M11/45B01D69/02
Inventor 胡云霞周浩媛刘中云胡巧霞
Owner YANTAI LVSHUIFU MEMBRANE MATERIAL
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