Preparation method of polytetrafluoroethyl hollow fiber membrane assembly

Abstract

The invention discloses a preparation method of a super-hydrophobicity PTFE hollow fiber membrane assembly. The preparation method comprises the following steps: mixing dispersing polymerization PTFE resin with super high molecular weight with a lubricant, and ripening and performing to prepare PTFE primary hollow fibers; extruding and forming the prepared PTFE primary hollow fibers under high pressure, and preparing a PTFE hollow-fiber membrane by defatting, drawing at high temperature and expanding, sintering and shaping; and carrying out wire burning, banding and sodium naphthalene surface treatment on the prepared PTFE hollow-fiber membrane, and finally preparing the super-hydrophobicity PTFE hollow fiber membrane assembly. By the preparation method, important performance indexes such as aperture, stretching strength, cross-sectional area and thicknesses of walls of hollow fiber tubes of the membrane assembly can be improved effectively, two technological difficulties including 'micropore structure' and difficulty in forming' of PTFE hollow fibers are solved, performance of the PTFE hollow fiber membrane is improved, and therefore, the problem that industrialization of PTFE hollow fiber membrane assemblies is relatively low is solved.

Description

technical field [0001] The invention belongs to the field of hollow fiber membrane preparation, and in particular relates to a preparation method of a polytetrafluoroethylene hollow fiber membrane module. Background technique [0002] At present, with the rapid development and growth of my country's chemical fertilizer, petrochemical and other industries, the high ammonia nitrogen wastewater produced is gradually increasing, and the concentration can reach 1000mg / L; in addition, the increase of domestic waste also makes the leachate wastewater ammonia nitrogen The content is higher, up to 2000mg / L. Because the existing ammonia nitrogen wastewater treatment technology is relatively backward, the cost of treating ammonia nitrogen wastewater is huge, which has seriously restricted the development of various industries such as petrochemical industry in China. [0003] Nowadays, in our country, the treatment of industrial wastewater and domestic sewage is gradually being paid att...

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Problems solved by technology

[0026] Aiming at the industry common problem of low industrialization of PTFE hollow fiber membranes at present, the present invention provides a novel preparation method of polytetrafluoroethylene hollow fiber membrane modules, which aims to improve the stability of polytetrafluoroethylene hollow fiber membranes, thereby solving the problem of polytetrafluoroethylene hollow fiber membranes. The problem of low industrialization of tetrafluoroethylene hollow fiber membrane modules

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