Method for enhancing hydrophilic stability of macromolecular film by using metal ions to complex with polyphenol

A metal ion and polymer membrane technology, applied in the field of membrane materials, can solve problems such as weak coating adhesion and coating, and achieve the effects of less additive dosage, good application prospects and lower modification costs.

Active Publication Date: 2019-01-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the coating process of these methods is simple and the modification effect is good, the adhesion of the coating formed only by the interaction of polyphenols and metal ions is still weak; if polyphenols and metal ions are soaked at the same time, it is easy to form a coating Previously agglomerated, making it impossible to coat the surface of the membrane

Method used

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  • Method for enhancing hydrophilic stability of macromolecular film by using metal ions to complex with polyphenol
  • Method for enhancing hydrophilic stability of macromolecular film by using metal ions to complex with polyphenol
  • Method for enhancing hydrophilic stability of macromolecular film by using metal ions to complex with polyphenol

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1) Soak the polyvinylidene fluoride microfiltration membrane with absolute ethanol for 30 minutes at room temperature, then take it out and rinse it with deionized water for 30 minutes;

[0034] 2) Add 20 mg of 3-chloropropyltrimethoxysilane (0.2 g / L) and 80 mg of polyethyleneimine (0.8 g / L) into 100 mL of deionized water, and stir for at least 15 min to obtain modified solution 1. Wash the polyvinylidene fluoride microfiltration membrane treated in step 1 with deionized water, add it to the modified solution 1, and soak it at room temperature for about 10 hours;

[0035] 3) Add 20 mg of tannic acid (0.2 g / L) into 100 mL of prepared tris-hydrochloric acid buffer solution with a pH value of 7.8 to obtain modified solution 2. Wash the polyvinylidene fluoride microfiltration membrane treated in step 2 with deionized water, add it to the modified solution 2, and soak it at room temperature for about 12 hours;

[0036] 4) 20mg of anhydrous ferric chloride (0.2g / L) was dissolv...

Embodiment 2

[0038] 1) Soak the polyvinylidene fluoride microfiltration membrane with isopropanol at room temperature for 30 minutes, then take it out and rinse it with deionized water for 30 minutes;

[0039] 2) Add 20 mg of 3-chloropropyltrimethoxysilane (0.2 g / L) and 80 mg of polyethyleneimine (0.8 g / L) into 100 mL of deionized water, and stir for at least 15 min to obtain modified solution 1. Wash the polyvinylidene fluoride microfiltration membrane treated in step 1 with deionized water, add it to the modified solution 1, and soak it at room temperature for about 10 hours;

[0040] 3) Add 20 mg of tannic acid (0.2 g / L) into 100 mL of prepared tris-hydrochloric acid buffer solution with a pH value of 7.8 to obtain modified solution 2. Wash the polyvinylidene fluoride microfiltration membrane treated in step 2 with deionized water, add it to the modified solution 2, and soak it at room temperature for about 12 hours;

[0041] 4) Dissolve 20mg aluminum sulfate dodecahydrate (0.2g / L) in ...

Embodiment 3

[0043] 1) Soak the polyvinylidene fluoride microfiltration membrane with absolute ethanol for 30 minutes at room temperature, then take it out and rinse it with deionized water for 30 minutes;

[0044] 2) Add 20 mg of 3-chloropropyltrimethoxysilane (0.2 g / L) and 80 mg of polyethyleneimine (0.8 g / L) into 100 mL of deionized water, and stir for at least 15 min to obtain modified solution 1. Wash the polyvinylidene fluoride microfiltration membrane treated in step 1 with deionized water, add it to the modified solution 1, and soak it at room temperature for about 10 hours;

[0045] 3) Add 20 mg of tannic acid (0.2 g / L) into 100 mL of Tris-hydrochloric acid buffer solution with a pH value of 7.8 to obtain modified solution 2. Wash the polyvinylidene fluoride microfiltration membrane treated in step 2 with deionized water, add it to the modified solution 2, and soak it at room temperature for about 12 hours;

[0046] 4) Dissolve 20mg of anhydrous copper sulfate (0.2g / L) in 100mL d...

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Abstract

The invention relates to a method for enhancing hydrophilic stability of a macromolecular film by using metal ions to complex with polyphenol. The method comprises the following steps of firstly, soaking the macromolecular film or an organic surface into an alcohol solvent or water, or cleaning; fetching out, and soaking by a mixed solution containing a crosslinking agent and hydrophilic moleculesfor the second time; fetching out, soaking into a mixed solution containing a polyphenol compound and a mixed solution containing metal ions, and modifying the surface for the third time and the fourth time; finally, fetching out, cleaning and drying. The method has the advantages that the conditions are mild, the operation is simple and convenient, the cost is lower, and the like; the hydrophilic property, anti-oil dirt property and hydrophilic stability of the obtained modified macromolecular film or the inorganic surface are obviously enhanced, the application range of the raw materials isgreatly broadened, and the popularization and application prospect is better.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a method for enhancing the hydrophilic stability of polymer membranes by complexing polyphenols with metal ions. Background technique [0002] Membrane separation technology is widely used in industrial fields such as separation, concentration, purification and purification of liquids. This method is an emerging separation technology. It has many important roles in sustainable development such as saving energy, developing new resources and solving environmental pollution problems. application. Compared with traditional separation technologies, membrane separation has the advantages of high separation precision, fast separation speed, low energy consumption, and long service life. [0003] Membrane material usually determines the efficiency and separation precision of membrane separation technology (see Chinese patent CN107174976A). Polyvinylidene fluoride (PVDF) has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02
CPCB01D67/0079B01D67/0093B01D69/02B01D2323/30B01D2325/36
Inventor 吴力立柳聪王光耀李木王新
Owner WUHAN UNIV OF TECH
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