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A kind of superhydrophilic gradient hole hollow fiber membrane and its preparation method

A gradient pore, fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. problems, to achieve the effect of reducing resistance, reducing water penetration resistance, and avoiding hydrophilic attenuation

Active Publication Date: 2015-12-09
江苏巨之澜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1905930A uses the non-alcoholic aqueous solution of surfactant sodium dodecylbenzene sulfonate to process the hydrophobic film, and then dries, but the adsorbed surfactant is easy to wash off during use, and cannot achieve permanent hydrophilicity
Another commonly used method is to add a hydrophilic polymer to the casting solution, but there is also the problem of easy elution
Patent CN101203554A uses chemical (such as persulfate), heat or radiation methods to cross-link the hydrophilic polymer in the membrane filament, but this measure will lead to the deterioration of the hydrophilicity of the hydrophilic polymer

Method used

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  • A kind of superhydrophilic gradient hole hollow fiber membrane and its preparation method
  • A kind of superhydrophilic gradient hole hollow fiber membrane and its preparation method
  • A kind of superhydrophilic gradient hole hollow fiber membrane and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 12wt% polyvinylidene fluoride, 5wt% amphiphilic block polyether modified silicone (wherein the number of repeating chains n of the polysiloxane chain segment is 500, the number of repeating chains m and p of the polyether chain segment is equal to 900), 12wt% PEG1000, 5wt% PVP-K90, 1wt% water and 65wt% DMF were mixed, stirred and dissolved at 50°C for 24 hours, and then defoamed for 12 hours to obtain the casting solution for later use. With DMF: NMP: water is 50wt%: 10wt%: 40wt% mixed solution is injection spinneret for core liquid, with DMF: NMP: water is 40wt%: 10wt%: 50wt% mixed solution is outer gel liquid, casting The film liquid is extruded from the spinneret under 500kPa and immersed in the outer gel liquid. During the spinning process, the temperature of the core liquid and the outer gel liquid are controlled to be 70°C and 55°C respectively, and the casting liquid forms primary fibers under the action of the core liquid and the outer gel liquid, which are then...

Embodiment 2

[0046] 13wt% polysulfone, 5wt% amphiphilic block polyether modified silicone (wherein the number of repeating chains n of the polysiloxane segment is 10000, the number of repeating chains m and p of the polyether segment are both 600 ), 15wt%PVP~17, 5wt%PVP-K90, 8wt% water and 54wt%DMAc were mixed, stirred and dissolved at 50°C for 24h, and then defoamed for 12h to obtain the casting solution for later use. Take DMAc: NMP: water as 10wt%: 50wt%: 40wt% mixed solution as the core liquid injection spinneret, with DMAc: NMP: water as 10wt%: 45wt%: 45wt% mixed solution as the outer gel liquid, cast The film liquid is extruded from the spinneret under 500kPa and immersed in the outer gel liquid. During the spinning process, the temperature of the core liquid and the outer gel liquid are controlled to be 65°C and 55°C respectively, and the casting liquid forms primary fibers under the action of the core liquid and the outer gel liquid, and then rinses them in pure water for 48 hours....

Embodiment 3

[0048] 14wt% polyethersulfone, 5wt% amphiphilic block polyether modified silicone (wherein the number of repeating chains n of the polysiloxane segment is 1800, and the number of repeating chains m and p of the polyether segment are both 900), 16wt% PVP-K30, 6wt% water and 59wt% NMP were mixed, stirred and dissolved at 60°C for 20h, and then defoamed for 16h to obtain the casting solution for later use. With DMF: NMP: water is 20wt%: 60wt%: 20wt% mixed solution is injection spinneret for core liquid, with DMF: NMP: water is 10wt%: 50wt%: 40wt% mixed solution is outer gel liquid, casting The film liquid is extruded from the spinneret under 500kPa and immersed in the outer gel liquid. During the spinning process, the temperature of the core liquid and the temperature of the outer gel liquid are controlled to be 75°C and 60°C respectively, and the casting liquid forms the primary fiber under the action of the core liquid and the outer gel liquid, and then rinses it in pure water ...

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Abstract

The invention discloses a super-hydrophilic and gradient hole structured hollow fiber membrane. The surfaces of the hollow fiber membrane and gradient holes contain super-hydrophilic amphipathic block polyether modified organosilicon; the gradient holes adopt a micro-nano ball-shaped network structure, namely, the gradient of hole diameters is increased from the outer surface layers to the inner surface layers along the radial cross section of the hollow fiber membrane. According to the invention, through adjusting and controlling the length and relative proportion of hydrophobic chain segments and hydrophilic chain segments in the amphipathic block polyether modified organosilicon, the graded distribution of the amphipathic block polyether modified organosilicon in the radial cross section of the membrane yarn is accurately controlled, and water increment speed difference at different parts can be realized, so that the hollow fiber membrane with the gradient hole structure is prepared; as a very strong hydrophobic interaction is formed between the hydrophobic parts of the amphipathic block polyether modified organosilicon and the polymer material, the hydrophily attenuation is avoided; according to the invention, the membrane hole structure of the hollow fiber membrane can be accurately controlled, the super / microfiltration water treatment membrane with super strength, super hydrophilia, ultra-low pressure or zero membrane pressure, ultrahigh water flux and ultrahigh antifouling property is obtained, the adjustment and control range is high, and the technology is simple.

Description

technical field [0001] The invention relates to the field of membranes, in particular to a hollow fiber membrane with superhydrophilic gradient pores and a preparation method thereof, in particular to a membrane with ultrahigh strength, superhydrophilicity, ultralow pressure or zero cross-membrane pressure, ultrahigh water flux, ultrahigh Ultra / microfiltration water treatment membrane with high anti-pollution performance. Background technique [0002] Membrane water treatment technology has the characteristics of high efficiency and energy saving. The promotion and application coverage of separation membrane technology reflects the level of energy utilization and environmental protection of a country and region to a certain extent. It is also a guarantee for the sustainable development of a society, and its strategic position is very prominent. . With the application of membrane technology in the field of water treatment, problems such as low membrane strength, low flux, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D71/68B01D71/30B01D71/42B01D71/80B01D69/08B01D69/02B01D67/00
Inventor 黄小军王礼伟张兰兰高巧灵
Owner 江苏巨之澜科技有限公司
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