Preparation method of polytetrafluoroethylene superfine fiber porous membrane

A polytetrafluoroethylene and ultra-fine fiber technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex production process, many influencing factors, large melt viscosity, etc. , the effect of short process and high porosity

Inactive Publication Date: 2009-09-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point and high melt viscosity of PTFE, its manufacturing method adopts an unconventional method, and the whole manufacturing process is complicated, the process is long, and there are many influencing factors.

Method used

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  • Preparation method of polytetrafluoroethylene superfine fiber porous membrane
  • Preparation method of polytetrafluoroethylene superfine fiber porous membrane
  • Preparation method of polytetrafluoroethylene superfine fiber porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 1.56g of polyvinyl alcohol in 12.37ml of water at 90°C, then mix evenly with 6.07g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 70:30 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micrometering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 15cm, the liquid flow rate is 0.01ml / min, and the voltage is 15kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite superfine fiber porous membrane is observed with a scanning electron microscope (see attached figure 1 ). The obtained composite microfiber porous membrane was sintered at a temperature of 390° C. for 2 min to remove polyvinyl alcohol to obtain a brown polytetrafluoroethylene ultrafine fiber porous membrane, which was obse...

Embodiment 2

[0029] Dissolve 2.2g of polyvinyl alcohol in 14.13ml of water at 90°C, then mix evenly with 3.67g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 50:50 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micrometering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 15cm, the liquid flow rate is 0.01ml / min, and the voltage is 15kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite microfiber porous membrane. The obtained composite ultrafine fiber porous membrane was sintered at a temperature of 390° C. for 2 minutes to remove polyvinyl alcohol to obtain a brown polytetrafluoroethylene ultrafine fiber ene porous membrane.

Embodiment 3

[0031] Dissolve 1.56g of polyvinyl alcohol in 12.37ml of water at 90°C, then mix evenly with 6.07g of high-concentration polytetrafluoroethylene aqueous emulsion to form a solid content of 26%, the mass ratio of polytetrafluoroethylene to polyvinyl alcohol It is a 70:30 spinning solution. Then add it to the liquid storage tank, transport it to the spinneret through a micro-metering pump, connect the spinneret to the high-voltage positive electrode, control the distance between the spinneret and the receiving device at 14cm, the liquid flow rate is 0.008ml / min, and the voltage is 17kV. Electrospinning obtains Polytetrafluoroethylene / polyvinyl alcohol composite microfiber porous membrane. The obtained composite ultrafine fiber porous membrane was sintered at a temperature of 390° C. for 2 minutes to remove polyvinyl alcohol, and a brown polytetrafluoroethylene ultrafine fiber porous membrane was obtained.

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Abstract

The invention discloses a preparation method of polytetrafluoroethylene superfine fiber porous membrane. In the method, high concentration polytetrafluoroethylene aqueous emulsion is mixed with matrix polymer uniformly to prepare spinning solution. With the effect of high voltage electric field, polytetrafluoroethylene/matrix polymer composite superfine fiber porous membrane with the diameter of 100 nm to 2 [mu]m is obtained by electrostatic spinning, and then polytetrafluoroethylene superfine fiber porous membrane is formed at the conditions of sintering temperature being 330 to 500 DEG C and the sintering time lasting 30s to 5min so that the aperture diameter is 100 nm to 10 [mu]m and the porosity is 50% to 80%. The polytetrafluoroethylene superfine fiber porous membrane prepared by using the method has uniform aperture diameter and high porosity, and can be widely applied to filter material. Compared with the existing technology, the preparation method has the characteristics of simple processing technology, short process and low cost.

Description

technical field [0001] The invention relates to a functional fiber membrane material and a preparation technology thereof, in particular to a preparation method of a polytetrafluoroethylene ultrafine fiber porous membrane. Background technique [0002] With the continuous acceleration of the industrialization process of countries in the world, air pollution and water pollution have become an increasingly serious problem, which poses a severe test to the ecological balance and human survival. At the same time, the semiconductor industry, precision instrument industry, biotechnology and other industries have higher and higher requirements for air purity. [0003] In order to meet the above requirements, many kinds of filter media have been developed and put into practical use. Among them, polytetrafluoroethylene has excellent chemical stability, good low friction and good insulation and heat insulation due to its wide temperature range (-200 ~ 260 ° C). Therefore, polytetraf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36
Inventor 熊杰霍鹏飞
Owner ZHEJIANG SCI-TECH UNIV
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