Oil-water separation method based on hydrophilic oleophobic fabric

A hydrophilic and oleophobic, oil-water separation technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve problems such as refractory degradation and human health hazards, and achieve the effect of safe production process and simple process

Active Publication Date: 2021-01-05
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, long carbon chain perfluoroalkyl groups are oxidatively degraded in the natural environment to generate corresponding perfluorocarboxylic acids or carboxylates, such as perfluorooctane sulfonic acid (PerfluorooctaneSulphonate, PFOS) and perfluorooctanoic acid (Perfluorooctanoic Acid, PFOA) and other environmental pollution These decomposition products are the most difficult to degrade organic pollutants and pose serious hazards to human health.

Method used

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  • Oil-water separation method based on hydrophilic oleophobic fabric
  • Oil-water separation method based on hydrophilic oleophobic fabric
  • Oil-water separation method based on hydrophilic oleophobic fabric

Examples

Experimental program
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preparation example Construction

[0040] The preparation method of above-mentioned hydrophilic oleophobic fabric disclosed by the present invention is as follows:

[0041] (1) Fiber surface quaternary ammonium salt pretreatment: first prepare polydiallyl dimethyl ammonium chloride aqueous solution, put it into the fabric, impregnate, squeeze, and dry;

[0042] (2) Preparation of sodium perfluoropolyether carboxylate aqueous solution: Add sodium hydroxide aqueous solution dropwise to perfluoropolyether carboxylic acid for neutralization reaction to obtain sodium perfluoropolyether carboxylate aqueous solution;

[0043] (3) Put the dried quaternized fabric into the aqueous solution of perfluoropolyether sodium carboxylate for exchange reaction; then take out the fluorinated fabric, wash it with water, and dry it to obtain a hydrophilic and oleophobic fabric. The fiber surface coating in the fabric is chemically Structural diagram see figure 1 .

Embodiment 1

[0047] 25g of polydiallyldimethylammonium chloride (polydiallyldimethylammonium chloride was purchased from Kunshan Shengan Biotechnology Co., Ltd., the model is D1UL (molecular weight 230,000-250,000), the following examples The same) was dissolved in 475g of water, and prepared into a polydiallyldimethylammonium chloride aqueous solution with a concentration of 5.0wt%. Then, 20g of polyester fabric was put into it, soaked for 30 minutes, and squeezed to control the squeeze rate to 50%. Dry at 50°C for 1 hour, weigh the fabric, and measure the primary weight gain rate of the fabric to be 4.4%; the fabric cannot be separated from oil and water;

[0048] Dissolve 0.4g of sodium hydroxide in 108g of water to prepare an aqueous sodium hydroxide solution with a mass concentration of 0.37%;

[0049] Under normal stirring, add 12 g of K-type perfluoropolyether carboxylic acid with a number average molecular weight of 3000 to a 500mL beaker, cool to 5°C, add the above aqueous sodium ...

Embodiment 2

[0057] Dissolve 50g of polydiallyldimethylammonium chloride in 450g of water to prepare a polydiallyldimethylammonium chloride aqueous solution with a concentration of 10.0%, then put 20g of polyester fabric into it, soak it for 30min, and squeeze the liquid , control the squeeze rate to 50%, dry at 50°C for 1h, weigh the fabric, and measure the primary weight gain rate of the fabric to be 6.2%. Treat the fabric to test infrared, see the results Figure 4 Curve PDA, visible fiber surface at 3500~3350 cm -1 Strong and broad characteristic absorption peaks of quaternary ammonium salts appeared in the range. Figure 5 The surface SEM image and EDS element distribution map of the treated polyester fabric were measured, among which, the C element was 64.031%, the N element was 3.148%, and the O element content was 32.821%. Since the polyester fabric does not contain N element, the test results show that polydiallyl two Methyl ammonium chloride has been coated on the fiber surface...

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Abstract

The invention discloses an oil-water separation method based on a hydrophilic oleophobic fabric. The method comprises the following steps: enabling an oil-water mixed solution to flow through the hydrophilic oleophobic fabric to finish oil-water separation; according to the method, the fiber surface is coated with quaternary ammonium salt firstly, then perfluoropolyether carboxylic acid anions andnitrogen positive ions are combined, the two steps of treatment are both achieved in an aqueous solution, perfluoropolyether carboxylic acid ammonium is generated on the fiber surface in situ, and the technical problem that perfluoropolyether carboxylic acid ammonium is hardly dissolved in all solvents and is difficult to spray or impregnate to treat the fabric is solved. According to the hydrophilic oleophobic fabric with the fiber surface coated with the fluorine-containing ammonium carboxylate polymer, hydration can be achieved when the fabric makes contact with water, the static contact angle of the fabric to water can be gradually decreased along with prolonging of the contact time and finally becomes hydrophilic, and the oleophobic function is provided when the fabric makes contactwith oil, and the method for obtaining the special wettability fabric and the oil-water separation fabric has the advantages of simple process, no use of organic solvents, mild operation conditions, and suitableness for process amplification and production.

Description

technical field [0001] The invention relates to a method for oil-water separation based on hydrophilic and oleophobic fabrics. Background technique [0002] The prior art provides a method for preparing an oil-water separation fabric and a superhydrophobic fabric thereof, the method comprising the following steps: S1, hydrolyzing tetrabutyl titanate to obtain a titanium dioxide sol; S2, adding siloxane to the titanium dioxide sol Carry out the reaction to obtain modified titanium dioxide sol; S3, use modified titanium dioxide sol to finish the special-shaped fiber fabric to obtain oil-water separation fabric, the preparation process is simple, and the prepared fabric has excellent wear resistance and durability. High oil-water separation efficiency. The prior art discloses a preparation method of an oil-water separation membrane, which belongs to the technical field of oil-water separation. The preparation method of the oil-water separation membrane is: using a solution-gel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022
CPCB01D17/0202Y02A20/204
Inventor 李战雄李宇楠候学妮刘群
Owner SUZHOU UNIV
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