Preparation method of hydrophilic PTFE (polytetrafluoroethylene) composite microporous membrane

A technology of polytetrafluoroethylene and microporous membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc.

Active Publication Date: 2015-02-18
中材科技膜材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention can effectively solve the problem that the polytetrafluoroethylene microporous membrane has limited its application in sewage treatment, medical treatment, sanitation and other fields due to its strong hydrophobicity; Provided is a method for preparing a hydrophilic polytetrafluoroethylene composite microporous membrane, which significantly improves the hydrophilic performance of the polytetrafluoroethylene microporous membrane, and makes the hydrophilic modification effect long-term stable

Method used

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  • Preparation method of hydrophilic PTFE (polytetrafluoroethylene) composite microporous membrane

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Embodiment 1

[0036] A preparation method of a hydrophilic polytetrafluoroethylene composite microporous membrane, the specific steps are as follows:

[0037] 1) Take polytetrafluoroethylene powder with a mass ratio of 50%, 40% solvent oil, and 10% nano-alumina particles. PTFE / Al was prepared after calendering, longitudinal drawing, heat treatment and transverse drawing 2 o 3 Composite microporous membrane;

[0038] 2) Add diethanolamine and silane coupling agent to water to form a modified aqueous solution, place the PTFE composite microporous membrane obtained in step 1) in ethanol until it becomes transparent, then immerse it in the modified aqueous solution, and carry out the surface treatment at room temperature. Take out and dry after coating for 60 minutes; the mass concentration of diethanolamine in the modified aqueous solution is 5%, and the mass concentration of silane coupling agent is 0.5%;

[0039] 3) Immerse the dried PTFE composite microporous membrane into glutaraldehyde...

Embodiment 2

[0041] A preparation method of a hydrophilic polytetrafluoroethylene composite microporous membrane, the specific steps are as follows:

[0042] 1) Measure polytetrafluoroethylene powder with a mass ratio of 60%, 35% solvent oil, and 5% nano-titanium dioxide particles, and mix them evenly in a "V"-shaped mixer. PTFE / TiO was prepared after drawing, heat treatment and horizontal drawing 2 Composite microporous membrane;

[0043] 2) Add polyvinyl alcohol and silane coupling agent to water to form a modified aqueous solution, soak the PTFE composite microporous membrane obtained in step 1) in ethanol until it becomes transparent, then immerse it in the modified aqueous solution, and perform surface treatment at room temperature After coating for 30 minutes, take it out and dry it; the mass concentration of polyvinyl alcohol in the modified aqueous solution is 10%, and the mass concentration of silane coupling agent is 0.2%;

[0044] 3) Immerse the dried PTFE composite microporou...

Embodiment 3

[0046] A preparation method of a hydrophilic polytetrafluoroethylene composite microporous membrane, the specific steps are as follows:

[0047] 1) Measure polytetrafluoroethylene powder with a mass ratio of 70%, 28% solvent oil, and 2% nano-silicon dioxide particles, and mix them evenly in a "V" type mixer. PTFE / SiO was prepared after longitudinal drawing, heat treatment and transverse drawing 2 Composite microporous membrane;

[0048] 2) Add polyvinyl alcohol and silane coupling agent to water to form a modified aqueous solution, soak the PTFE composite microporous membrane obtained in step 1) in ethanol until it becomes transparent, then immerse it in the modified aqueous solution, and perform surface treatment at room temperature Take out and dry after coating for 90 minutes; the mass concentration of polyvinyl alcohol in the modified aqueous solution is 1%, and the mass concentration of silane coupling agent is 0.5%;

[0049] 3) Immerse the dried PTFE composite micropor...

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Abstract

The invention relates to a preparation method of a hydrophilic PTFE (polytetrafluoroethylene) composite microporous membrane. The preparation method comprises the following steps: 1, adding inorganic nano particles in the formula of a PTFE raw material, uniformly mixing and stretching to obtain a PTFE composite microporous membrane; 2, adding a polyhydroxy compound and a couping agent to water to prepare a modified water solution, soaking the PTFE composite microporous membrane obtained in the step 1 until the membrane is transparent, then dipping into the modified water solution, taking out and drying; and 3, dipping the dried PTFE composite microporous membrane in a pentanedial solution, and after taking out, washing and drying to obtain the hydrophilic PTFE composite microporous membrane. The preparation method has the advantages that after the PTFE composite microporous membrane is treated by the modifying method, the hydrophilic property of the membrane is remarkably improved; persistence of the hydrophilic property is obviously improved while the hydrophilic property is ensured; the preparation process is easy and feasible, is low in cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the application field of PTFE water treatment membranes, in particular to a preparation method of a hydrophilic polytetrafluoroethylene composite microporous membrane, more specifically to a preparation of a polytetrafluoroethylene / inorganic nanoparticle composite microporous membrane and its Physico-chemical modification method of cross-linked hydrophilic layer connected by surface chemical bond. Background technique [0002] Polytetrafluoroethylene (PTFE) is a special engineering plastic with excellent comprehensive properties, and has the reputation of "King of Plastics". Using PTFE powder as raw material, the stretched PTFE membrane has a microporous structure with microfibrils and nodes connected. Films with this special microporous structure are widely used in many fields such as filtration, clothing, biology, and medicine. . However, due to the low surface tension and poor surface wettability of PTFE, its wider applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D69/02B01D67/00
Inventor 宋尚军黎鹏白耀宗范凌云费传军余佳彬郭晓蓓周群徐山
Owner 中材科技膜材料(山东)有限公司
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