Preparation method of hydrophilic polytetrafluoroethylene hollow fiber membrane

Abstract

The invention discloses a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber membrane. The preparation method specifically comprises the following steps: S1, preparing a PTFE / SiO2 composite hollow fiber membrane; S2, performing hydrophilic modification on the PTFE / SiO2 composite hollow fiber membrane; and S3, performing a hydrophily attenuation test on modified membrane yarns. The invention belongs to the technical field of water treatment of PTFE hollow fiber membrane. The invention discloses a preparation method of the hydrophilic polytetrafluoroethylene hollow fiber membrane. According to the preparation method, physicochemical cross-linking method is adopted; under the action of a coupling agent and a cross-linking agent, hydroxyl (-OH) is introduced onto the surface of the membrane to prepare the PTFE microporous membrane with stable hydrophilic performance; the hydrophilic performance of the composite microporous membrane is obviously improved; the stabilityof the hydrophilic performance of the PTFE hollow fiber membrane is ensured; the pure water flux of the modified membrane filaments can reach 3500L / m<2>*h, the water contact angle is 60 degrees, theadvantages of the PTFE hollow fiber membrane products are improved, the surface of the PTFE hollow fiber membrane has stable hydrophilic performance, and the application range of the PTFE hollow fibermembrane in the fields of membrane separation and water treatment is expanded.

Description

technical field [0001] The invention relates to the technical field of PTFE hollow fiber membrane water treatment, in particular to a preparation method of a hydrophilic polytetrafluoroethylene hollow fiber membrane. Background technique [0002] Membrane separation technology is a new type of separation technology developed in recent years. It is a method of separating mixtures by using a specially manufactured membrane with selective permeability and driven by external force. When the mixture of molecules with different particle sizes passes through the semi-permeable membrane, it can achieve selective separation technology, including hollow fiber membrane, roll membrane, flat membrane and other assembly methods. It has the advantages of high efficiency, small equipment, simple structure, and easy operation, and is widely used in separation technologies such as microfiltration (MF), ultrafiltration (UF), reverse osmosis (RO), nanofiltration (NF), and membrane bioreactor (M...

AI Technical Summary

Problems solved by technology

Among them, PTFE will release a toxic substance perfluoroisobutylene during the high-temperature melting process, and it is not easy to maintain its shape. The surface of the PTFE film after chemical treatment will obviously darken and affect the performance of the material body. The process will also produce a lot of harmful substances. Waste liquid, seriously pollutes the environment, and has a high risk of operation; high-temperature radiation grafting will damage the PTFE matrix, resulting in a decrease in its mechanical properties

These modification methods more or less have the disadvantages of destroying the structure of the membrane body, the modification effect is not long-lasting, the operation steps are complicated, and the equipment is complicated, which limits the application of PTFE membranes in water treatment.

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