Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of composite nanofiber ultra-filtration membrane

A nanofiber membrane and nanofiber technology, applied in the field of preparation of filter membrane materials, to achieve the effects of promoting development and application, low cost, and high retention rate

Inactive Publication Date: 2015-12-30
DONGHUA UNIV
View PDF7 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for preparing a nanofiber composite ultrafiltration membrane. The bonding process used in the method of the present invention is simple, fast, and does not require complicated processing, and high-strength nanofibers can be prepared conveniently, quickly and cheaply. Membrane; the preparation method of the present invention is convenient and fast, and the obtained nanofiber membrane has the advantages of high strength, good elasticity, high oily sewage retention rate and high pure water flux, which will break the defect of low strength of nanometer membrane in application, Promote the marketization process of nanomaterials, and promote the further expansion of the application of nanomaterials in the fields of biomedicine, filter materials, composite materials, electronics, and nanosensors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of composite nanofiber ultra-filtration membrane
  • Preparation method of composite nanofiber ultra-filtration membrane
  • Preparation method of composite nanofiber ultra-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Dissolve 1.4g of polyacrylonitrile in 8.6g of N,N-dimethylformamide, stir for 8h until completely dissolved, and obtain polyacrylonitrile / N,N-dimethylformamide with a concentration of 14% (g / g). Formamide spinning solution. Use a 10ml syringe and a needle with an inner diameter of 0.5mm to draw out the polyacrylonitrile / N,N-dimethylformamide spinning solution, and fix it on a micro-syringe pump. through as figure 1 The electrospinning device shown is used for electrospinning, and the parameters are: voltage 13KV, receiving distance 20cm, injection rate 0.3ml / h, ambient temperature 25°C, and ambient relative humidity 45%.

[0048] After the non-woven fabric / electrospinning nanofiber film / non-woven fabric is combined, the ultrasonic bonding process is used to prepare high-strength nanomaterials. The ultrasonic bonding parameter is the working pressure of 6Kg / cm 2 , the vibration frequency is 30KHz, and the rotation speed of the output wheel is 0.2m / min. Table 1 shows ...

Embodiment 2

[0050] Dissolve 1.2 g of polyacrylonitrile in 8.8 g of N,N-dimethylformamide, stir for 8 hours until completely dissolved, and obtain polyacrylonitrile / N,N-dimethylformamide with a concentration of 12% (g / g). Formamide spinning solution. Use a 10ml syringe and a needle with an inner diameter of 0.5mm to draw out the polyacrylonitrile / N,N-dimethylformamide spinning solution, and fix it on a micro-syringe pump. through as figure 1 The electrospinning device shown is used for electrospinning, and the parameters are: voltage 12KV, receiving distance 20cm, injection rate 0.6ml / h, ambient temperature 25°C, and ambient relative humidity 55%.

[0051] The non-woven fabric / electrospinning nanofiber film / non-woven fabric is combined and then hot-rolled and bonded to prepare high-strength nanomaterials. The temperature was 100° C., and the hot rolling speed was 0.2 m / min. Table 2 shows the strength and oily sewage filtration test data of the obtained nonwoven fabric / electrospun nanof...

Embodiment 3

[0053] Dissolve 1.4g of polyvinylidene fluoride in 8.6g of N,N-dimethylformamide, stir for 8h until completely dissolved, and obtain a concentration of 14% (g / g) of polyvinylidene fluoride / N,N-dimethylformamide Methylformamide spinning solution. Use a 10ml syringe and a needle with an inner diameter of 0.5mm to draw out the polyvinylidene fluoride / N,N-dimethylformamide spinning solution, and fix it on a micro-syringe pump. through as figure 1 The electrospinning device shown is used for electrospinning, and the parameters are: voltage 13KV, receiving distance 20cm, injection rate 0.6ml / h, ambient temperature 25°C, and ambient relative humidity 45%.

[0054] The non-woven fabric / electrospinning nanofiber film / non-woven fabric is composited and then the plate vulcanization thermal bonding process is used to prepare high-strength nanomaterials. The plate vulcanization thermal bonding parameters are the linear pressure between the upper and lower plates. The temperature is 90°C...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method of a composite nanofiber ultra-filtration membrane. The preparation method comprises the following steps: dissolving a high-molecular polymer in a solvent, and then stirring uniformly to obtain a spinning solution, and performing electrostatic spinning to obtain a nanofiber membrane; compounding the nanofiber membrane with nonwoven fabric to obtain nonwoven fabric / nano-membrane / nonwoven fabric composite membrane; performing bonding treatment on the nonwoven fabric / nano-membrane / nonwoven fabric composite membrane to obtain the composite nanofiber ultra-filtration membrane. The preparation method of the composite nanofiber ultra-filtration membrane, provided by the invention, is convenient and fast, the obtained composite membrane has the advantages that the strength variation range is within 50 N-60 N, the elongation at break is 50-75%, which is 60-70 times that of a pure nano membrane, the emulsified oil reject rate reaches up to 98.56%, which is higher than a PVDF commodity ultra-filtration membrane's 97%, the pure water flux is 4004L / (m<2>*h), and the obtained composite membrane is further suitable for fields like medicine, food, environmental protection, bioengineering and the like.

Description

technical field [0001] The invention belongs to the field of preparation of filter membrane materials, in particular to a preparation method of a nanofiber composite ultrafiltration membrane. Background technique [0002] The sources of oily sewage are very wide, such as petrochemical, mining, mechanical processing, leather, textile, food and other industries, and the discharge volume is large. If it is directly discharged into the water body, it will cause great harm to the natural ecological balance. The traditional treatment methods for oily sewage include physical methods, chemical methods, physicochemical methods and microbial methods, but the traditional sewage treatment methods have low efficiency, high cost and secondary pollution. With the development of modern science and technology, polymer membrane materials are more and more used in sewage treatment, and nanofiber membrane is one of the most advantageous. [0003] The diameter of electrospun nanofibers is betwe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D69/12B01D67/00B01D71/06
Inventor 覃小红娄莉华张弘楠
Owner DONGHUA UNIV