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Method for producing polytetrafluoroethylene hollow fiber tube

A polytetrafluoroethylene and production method technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as difficult operation, and achieve improved production efficiency, strong practicability, and good calendering effect. Effect

Inactive Publication Date: 2016-11-23
QINGDAO YUANDONG FLON NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the consistent micropore structure of the inner and outer layers of the PVDF hollow fiber membr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The technical scheme of the present invention is: a production method of polytetrafluoroethylene hollow fiber tubes, the production steps of which include: (1) sieving raw materials: sieving the stored PTFE dispersion resin with a screen; Pressure aid: add the sieved PTFE dispersion resin to a dry and clean jar, add extrusion aid to the resin, and then cover the lid; place the jar on a mixer with a speed of 20rpm to stir, After the mixing is completed, place it for 24 hours; (3) Pre-compression molding: Press the powder into a shape that can be loaded into the extrusion cylinder; (4) Push extrusion: Put the billet into the extrusion cylinder, and push it through the plunger Press to force it to push out the tubular preform from the die. During the pushing process, the PTFE dispersed resin becomes an oriented fiber structure; (5) Calendering: Before calendering, heat the pipe in hot water to soften the parison ; Control the rotation speed and surface temperature of the c...

Embodiment 2

[0040] The difference between this embodiment and Embodiment 1 is that the mesh size of the screen in this embodiment is 10 mesh.

Embodiment 3

[0042] The difference between this embodiment and Embodiment 1 is that the stirring time of this embodiment is 25 minutes.

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PUM

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Abstract

The invention relates to a method for producing a polytetrafluoroethylene hollow fiber tube, due to the self characteristics of PTFE materials, a PTFE hollow fiber membrane can be used in a wider temperature range under more complex conditions, after calendaring, vertical stretching and radial expansion, the PTFE hollow fiber membrane has a unique micro-pore structure, the inner aperture is greater than the outer aperture, the porosity is more uniform, by changing the ratio of the vertical stretching and the radial expansion, the micro-pore morphology of the PTFE hollow fiber membrane can be controlled, according to different requirements, products with different pore sizes can be produced, production quality and production efficiency can be effectively improved, and production cost is reduced.

Description

technical field [0001] The invention relates to a production method of a polytetrafluoroethylene hollow fiber tube. Background technique [0002] At present, hollow fiber membrane materials mainly include organic membranes such as PVDF, PP, PE, and PVC, and inorganic ceramic membranes such as alumina and zirconia. The preparation methods mainly include spinning method and casting / coating membrane method. Among them, the preparation of hollow fiber membranes by solution spinning phase separation method is the most commonly used preparation method, such as PVDF. PP and PE hollow fiber membranes are drawn by melt spinning. [0003] The manufacturing process of the organic membrane is simple and convenient, the membrane product is easy to deform, and the packing density of the membrane module is high. However, it is unstable when exposed to heat, not resistant to high temperature, easy to swell in liquid, and has low strength; the inorganic film does not deform, is resistant t...

Claims

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Application Information

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IPC IPC(8): B01D69/04B01D69/08B01D71/36B01D67/00
Inventor 宋冠军
Owner QINGDAO YUANDONG FLON NEW MATERIALS
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