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Method of amphipathic nature fluorine-contained copolymer modifying surface of polytetrafluoroethylene porous membrane

A polytetrafluoroethylene, surface modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of shortened membrane life, low surface energy, low water flux, etc. The effect of large-scale industrial production, improved anti-pollution performance, and simple coating equipment

Inactive Publication Date: 2008-01-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented describes an improvement over current methods by modifying certain materials within the polymer matrix without changing its chemical composition. By adding specific types of molecules called fluorescein (F) which absorb light at different wavelength ranges, these modifications make it easier to detect them during manufacturing processes. These improvements result in better antifoulant behavior compared to non-magnetic versions made from pure TFE resins alone. Additionally, they improve filter efficiency when treated with strongly alkalines like sulfur dioxide gas while reducing fouled areas caused by other substances such as calcium carbonates found in hardened waters.

Problems solved by technology

This patented technical problem addressed in this patent relates to modifying surfaces of special types of materials called microporous films like those described above, specifically nanoplasmonium oxide (NPFO) porous ceramics. Current techniques involve either adding surfactants or modifications involving complicated procedures. There also exist concerns about environmental pollution caused by these agents themselves. To address these issues, research into developing new coatings that could improve their durability while maintaining antifriction capabilities over traditional chemically crosslinked ones was conducted earlier.

Method used

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  • Method of amphipathic nature fluorine-contained copolymer modifying surface of polytetrafluoroethylene porous membrane
  • Method of amphipathic nature fluorine-contained copolymer modifying surface of polytetrafluoroethylene porous membrane
  • Method of amphipathic nature fluorine-contained copolymer modifying surface of polytetrafluoroethylene porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Wash hexafluorobutyl methacrylate and oxyethylene methacrylate with 5% NaOH for 3 times, then wash with deionized water to pH 7, and then add calcium hydride to store for 24 hours, N, N '-Dimethylformamide is added to calcium hydride and stored for 24 hours, and the above reagents are stored under reduced pressure and distillation;

[0043] 2. Dissolve 1 mol of purified hexafluorobutyl methacrylate and 0.5 mol of oxyethylene methacrylate in an equal volume of polar solvent N, N'-dimethylformamide, and add 1 / 600 dibenzoyl peroxide, reflux for 6 hours, and precipitate in petroleum ether. After filtering and washing, vacuum drying treatment.

[0044] 3. The random copolymer of hexafluorobutyl methacrylate and oxyethylene methacrylate purified in the above step is dissolved in water.

[0045] 4. Coat the solution prepared in the above steps on the upper and lower surfaces of a 20×10 cm uniaxially stretched polytetrafluoroethylene flat porous membrane at a coating temperatur...

Embodiment 2

[0048] 1. Dissolve hexafluorobutyl methacrylate in N,N'-dimethylformamide under argon atmosphere, the solution concentration is 25%, and add ethyl α-bromopropionate and cuprous bromide With bipyridine, the ratio of the three is 1:1:3, cuprous bromide is 1 / 200 of the monomer, freeze with liquid nitrogen, vacuum to remove oxygen, thaw, repeat twice, move into 45℃ oil bath and stir 48 hours;

[0049] 2. Precipitate the product of step 1 in an excess of absolute ethanol, dissolve and precipitate for several times and then vacuum dry, dilute, filter with a chromatographic column, filter by precipitation, and vacuum dry to constant weight at 25°C;

[0050] 3. Dissolve the product of step 2 and oxyethylene methacrylate in N,N'-dimethylformamide under nitrogen atmosphere, the solution concentration is 25%, add cuprous bromide and bipyridine, the ratio of the two 1:3, cuprous bromide is 1 / 300 of the monomer, freeze with liquid nitrogen, vacuum to remove oxygen, thaw, repeat 4 times, move i...

Embodiment 3

[0055] 1. Dissolve oxyethylene methacrylate in N,N'-dimethylformamide under a nitrogen atmosphere, the solution concentration is 75%, add ethyl α-bromopropionate, cuprous chloride, and Dipyridine, the ratio of the three is 1:1:3, cuprous chloride is 1 / 200 of the monomer, freeze with liquid nitrogen, vacuum to remove oxygen, thaw, repeat twice, move into an oil bath and stir for 4 hours. The bath temperature is 90℃;

[0056] 2. Precipitate the product of step 1 in an excess of anhydrous methanol, dissolve and precipitate it for several times, and then vacuum dry, dilute, filter with a chromatography column, filter by precipitation, and vacuum dry at 25°C to constant weight;

[0057] 3. Dissolve the product of step 2 and hexafluorobutyl methacrylate in N,N'-dimethylformamide under an argon atmosphere, the solution concentration is 75%, add cuprous chloride and bipyridine, two The ratio is 1:3, cuprous chloride is 1 / 300 of the monomer, freeze with liquid nitrogen, vacuum to remove ox...

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Abstract

The invention discloses a method of amphipathy fluorinated multipolymer modifying the surface of tetrafluoroethylene blownfilm. The fluorinated multipolymer is achieved by aggregating of fluorinated (methyl) ACR monomer A and (methyl) ACR monomer B. The preparing and modifying tetrafluoroethylene blownfilm is that: firstly, aggregate the fluorinated (methyl) ACR monomer A and (methyl) ACR monomer B to achieve amphipathy fluorinated random or amphiphilic block or triblock copolymer; then compound the copolymer with the tetrafluoroethylene blownfilm by the way of coating, to prepare hydrophile tetrafluoroethylene blownfilm which can achieve by stretching in one-way or two-way. The prepared hydrophile tetrafluoroethylene blownfilm not only has the characters of age resistant, resistant to chemical attack and wide applicable temperature, but also has good hydrophilicity, large water flux. The method can be suitable for the surface modifying of tabular, tubular and hollow fiber tetrafluoroethylene blownfilm.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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