Preparation method of positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane

A technology of polytetrafluoroethylene and composite nanofiltration membrane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of complex nanofiltration membrane structure and complex preparation process, and achieve small footprint and structural details Combined effect

Active Publication Date: 2016-08-17
广州市东泓氟塑料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonds of each layer form a stable chemical bond, which has excellent compression resistance and mechanical strength. The structure of the nanofiltration membrane is too complicated, and the preparation process is too complicated

Method used

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  • Preparation method of positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane
  • Preparation method of positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane
  • Preparation method of positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Activation: inject 0.1% mass concentration carboxylated chitosan aqueous solution into the interior of the hydrophobic polytetrafluoroethylene hollow fiber membrane with a syringe, fill it up, and stay for 10 min; Obtain active basement membrane;

[0023] (2) Aqueous phase impregnation: inject a 0.2% aqueous solution of hyperbranched polyethyleneimine into the active base membrane with a syringe, fill it up, and stay for 1 min, then suck out the excess solution with a syringe, and dry it in the air to obtain Interlayer 1;

[0024] (3) Oil phase impregnation: use a syringe to inject 0.1% trimesoyl chloride n-hexane solution into the interior of the intermediate film 1, fill it up, stay for 5 s, and then place it in the air to dry to obtain the intermediate film 2;

[0025] (4) Heat treatment: inject deionized water into the interior of the interlayer membrane 2 with a syringe, fill it up, suck it out, and repeat once; then put it in a drying oven at 30°C, stay for 2...

Embodiment 2

[0028] (1) Activation: inject 4.0% mass concentration of carboxylated chitosan aqueous solution into the interior of the hydrophobic polytetrafluoroethylene hollow fiber membrane with a syringe, fill it up, and stay for 60 minutes; active basement membrane;

[0029] (2) Aqueous phase impregnation: inject a 2.0% aqueous solution of hyperbranched polyethyleneimine into the active base membrane with a syringe, fill it up, and stay for 30 min, then suck out the excess solution with a syringe, and dry it in the air to obtain Interlayer 1;

[0030] (3) Oil phase impregnation: use a syringe to inject a toluene solution of 5.0% isophthaloyl chloride into the interior of the intermediate film 1, fill it up, stay for 30 minutes, and then dry it in the air to obtain the intermediate film 2;

[0031] (4) Heat treatment: inject deionized water into the interior of the interlayer 2 with a syringe, suck it out, and repeat 5 times; then put it in a drying oven at 100°C, fill it up, stay for ...

Embodiment 3

[0034] (1) Activation: inject 1.0% mass concentration of carboxylated chitosan aqueous solution into the interior of the hydrophobic polytetrafluoroethylene hollow fiber membrane with a syringe, fill it up, and stay for 30 minutes; active basement membrane;

[0035] (2) Aqueous phase impregnation: inject a 0.8% mass concentration hyperbranched polyethyleneimine aqueous solution into the active base membrane with a syringe, fill it up, and stay for 10 min, then suck out the excess solution with a syringe, and dry it in the air to obtain Interlayer 1;

[0036] (3) Oil phase impregnation: use a syringe to inject 4.0% n-octane solution of terephthaloyl chloride into the interior of the intermediate film 1, fill it up, stay for 20 minutes, and then dry it in the air to obtain the intermediate film 2 ;

[0037](4) Heat treatment: use a syringe to inject deionized water into the interior of the interlayer 2, suck it out, and repeat 4 times; then put it in a drying oven at 50°C, fil...

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Abstract

The invention discloses a preparation method of a positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane. The method includes the following steps of injecting a carboxylation chitosan aqueous solution into a hydrophobic polytetrafluoroethylene hollow fiber membrane through an injector to obtain an active base membrane, injecting a hyperbranched polyethylenimine aqueous solution into the active base membrane to obtain a middle membrane 1, injecting acyl chloride monomer organic solvent into the middle membrane 1 to obtain a middle membrane 2, injecting deionized water into the middle membrane 2, and putting the middle membrane into a drying box to be dried to obtain the positively-charged hollow polytetrafluoroethylene composite nanofiltration membrane. Reactivity of carboxylation chitosan, hyperbranched polyethylenimine and acyl chloride monomer is adopted, and the membrane preparation process is simple. In addition, due to the unique molecular structure of hyperbranched polyethylenimine, the prepared composite nanofiltration membrane is positively charged, has the advantage of being high in reject rate and can be used for the fields of water treatment and the like.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane, in particular to a preparation method of a positively charged hollow polytetrafluoroethylene composite nanofiltration membrane. Background technique [0002] The nanofiltration process is between reverse osmosis and ultrafiltration, and can separate monovalent salts, divalent salts, and components with a molecular weight between 200-2000. The current nanofiltration composite membranes mostly use polymers such as polysulfone, polypropylene, and polyvinylidene fluoride as the base membrane, and at the same time add non-woven fabric as the support layer, and add a modified layer. Patent CN103223300A discloses a composite nanofiltration membrane composed of hollow fiber microporous base membrane, polysulfone transition layer and polyamide composite layer. Patents CN103638832A and CN103055715A disclose a polyamide composite membrane, which consists of three layers of non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D69/08B01D67/00
CPCB01D67/0002B01D69/08B01D69/12B01D71/36B01D2323/46B01D2325/16
Inventor 唐红艳郭玉海郝丽婷王峰张华鹏
Owner 广州市东泓氟塑料股份有限公司
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