Small-pore-diameter narrow-distribution polytetrafluoroethylene microporous membrane and preparation method thereof

A polytetrafluoroethylene, narrow distribution technology, applied in the field of membrane preparation, polytetrafluoroethylene microporous membrane, can solve the problems of reducing the pore size distribution range, poor processing performance, poor fluidity, etc., to achieve precise control of the microporous structure , The effect of improving the yield and reducing the difficulty of processing

Inactive Publication Date: 2019-01-18
华设设计集团环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, PTFE is insoluble in general solvents, has high viscosity and poor fluidity at high temperatures, and its "insoluble and infusible" characteristics make its processing performance poor. In order to process polytetrafluoroethylene microporous membranes with developed porosity, most of them adopt biaxial stretching process , including two-way synchronous stretching or first longitudinal and then transverse methods, the prepared PTFE microporous membrane has higher porosity and larger pore size distribution, further reduces the pore size, and reduces the pore size distribution range to become polytetrafluoroethylene microporous Technical bottleneck of membrane development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a polytetrafluoroethylene microporous membrane with narrow distribution of small pore diameters, the specific steps are as follows:

[0034] Mix the dispersed polytetrafluoroethylene resin F106, Mobil M oil, and docusate sodium in a mass ratio of 70:20:10, and then seal and age at 40°C for 12 hours.

[0035] The aged mixture is placed in a compacting machine at 40°C and pressed into a cylindrical green body, which is pushed into a rod shape by a plunger extruder at 50°C, and then rolled into a rod by a calender at 50°C Baseband.

[0036] The formed base tape is sequentially carried out in an oven: deoiling at 180°C for 2 minutes, longitudinal stretching at 280°C for 6 times, heat treatment at 200°C for 60s, transverse stretching at 280°C for 9 times, and finally sintering at 320°C For 30 seconds, a polytetrafluoroethylene microporous membrane with small pore size and narrow distribution was obtained with an average pore size of 22 nm and a bubbl...

Embodiment 2

[0038] A preparation method of a polytetrafluoroethylene microporous membrane with narrow distribution of small pore diameters, the specific steps are as follows:

[0039] After mixing the dispersed polytetrafluoroethylene resin DF204, white oil, and docusate sodium in a mass ratio of 65:20:15, seal and age at 60°C for 24 hours.

[0040] After aging, the mixture is placed in a compactor at 50°C to form a cylindrical billet, and the cylindrical billet is extruded into a rod by a plunger extruder at 60°C, and then rolled into a base tape by a calender at 60°C .

[0041] The formed base tape is sequentially carried out in an oven: deoiling at 150°C for 5 minutes, longitudinal stretching at 320°C for 12 times, heat treatment at 250°C for 30s, transverse stretching at 320°C for 9 times, and finally sintering at 350°C For 10 seconds, a polytetrafluoroethylene microporous membrane with small pore size and narrow distribution was obtained with an average pore size of 50 nm and a bubb...

Embodiment 3

[0043] A preparation method of a polytetrafluoroethylene microporous membrane with narrow distribution of small pore diameters, the specific steps are as follows:

[0044] Mix dispersed polytetrafluoroethylene resin F104, Mobil G oil, and fatty alcohol polyoxyethylene ether AEO20 in a mass ratio of 60:15:25, then seal and age at 60°C for 6 hours.

[0045] After aging, the mixture is placed in the compactor at 50°C to form a cylindrical green body, and the cylindrical green body is pushed into a rod shape by a plunger extruder at 50°C, and then rolled into a base belt by a calender at 50°C .

[0046] The formed base tape is sequentially carried out in an oven: deoiling at 150°C for 5 minutes, longitudinal stretching at 280°C for 9 times, heat treatment at 180°C for 180s, transverse stretching at 280°C for 9 times, and finally sintering at 350°C In 20 seconds, a polytetrafluoroethylene microporous membrane with small pore size and narrow distribution was obtained with an averag...

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Abstract

The invention discloses a preparation method of a small-pore-diameter narrow-distribution polytetrafluoroethylene microporous membrane. By mixing of dispersible polytetrafluoroethylene resin, solventoil and a surface active agent and adopting the processes of ageing, blank manufacture, pushing and squeezing, calendaring, oil removal, longitudinal pulling treatment, horizontal pulling treatment, sintering and sizing and the like, the polytetrafluoroethylene microporous membrane with the pore diameter being 10-50nm and the bubble-point pore diameter being less than 80nm is manufactured; the surface active agent is added into a formula, and by the action of the surface active agent, the wettability of the solvent oil is obviously improved, and the wrapping degree of the solvent oil to the polytetrafluoroethylene resin is obviously improved, so that the formation degree of micropores in the drawing and expanding processes is greatly reduced; under the action of same shearing force, the formed micropores are more and smaller, so that the microporous membrane with small pore diameter and narrow distribution is obtained; the preparation method is easy in industrial production, can utilize the existing manure equipment only in need of proper process adjustment, and has strong practicability and wide applicability.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene microporous membrane, in particular to a polytetrafluoroethylene microporous membrane with small pore size and narrow distribution and a preparation method thereof, belonging to the technical field of membrane preparation. Background technique [0002] Due to a series of excellent chemical and physical properties, polytetrafluoroethylene (PTFE) is a special engineering plastic with excellent comprehensive properties, and has the reputation of "King of Plastics". It is used in many fields and is also an important membrane material. [0003] The PTFE microporous membrane is made of dispersed PTFE resin, which forms a microstructure of "microfibrils-nodes" under shearing action, and the microfibrils and nodes interweave to form micropores. PTFE microporous membrane has the advantages of small pore size, high porosity, high and low temperature resistance, corrosion resistance, waterproof, breathable, wind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D67/00B01D69/04
CPCB01D67/0002B01D67/0004B01D69/04B01D69/043B01D71/36
Inventor 黎鹏曹亚丽王霞臧正保王磊李振周超吴良杨力凯赵雨
Owner 华设设计集团环境科技有限公司
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