Preparation method of polymer film with hydrophilic and anti-fouling performance

Abstract

The invention provides a preparation method of a polymer film with hydrophilic and anti-fouling performance. The preparation method is characterized by including the steps of firstly, adding macroinitiator end halogen polydimethyl siloxane, a complexing agent, a monomer, a catalyst cuprous halide and a solvent into a reaction container, heating to 20-120 DEG C under magnetic stirring, performing reaction for 1-72 hours, and purifying to obtain amphiphilic polymer; secondly, blending a polymer film material, a solvent, a pore-foaming agent and the amphiphilic polymer obtained in the first step to prepare a film casting solution, and using the film casting solution to prepare a hydrophilic polymer film; thirdly, placing the hydrophilic polymer film obtained in the second step into the ethanol solution of 3-bromo-propionic acid, performing oscillatory reaction under 0-70 DEG C to achieve surface amphoteric ionization of the polymer film so as to obtain the polymer film with hydrophilic and anti-fouling performance. The polymer film is applicable to water treatment and especially applicable to municipal water and industrial water purification.

Description

technical field

[0001] The invention relates to a method for preparing a polymer film with hydrophilic and antifouling properties, more specifically, a polymer film with amphiphilic polymer blending modification and its surface amphiphilic ionization and its preparation method . Background technique

[0002] In the process of membrane water treatment, polymer separation membranes used for nanofiltration or ultrafiltration are often plagued by the problem of interface fouling. For example, PVDF, a commonly used membrane material, due to the presence of fluorine atoms in the molecular structure of PVDF, makes the surface energy of pure PVDF membranes lower (critical surface tension γ c =25mN / m), it is non-polar, and there is no hydrogen bond between the membrane surface and water, so it has extremely strong hydrophobicity, which restricts its development in aqueous phase separation systems. In the process of water treatment, water molecules need to overcome high resistance t...

Examples

Embodiment 1

[0057] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0058] In a 250mL three-necked flask, add 30g (7.5mmol) hydroxypropyl silicone oil (molecular weight: 4000g / mol), 1.6g (15.5mmol) triethylamine and 40ml THF, place in an ice-water bath, and pass through the flask for 10min. 2 Air to remove air. A mixture of 3.5g (15mmol) 2-bromoisobutyryl bromide and 20ml tetrahydrofuran was slowly added dropwise in a constant pressure dropping funnel, and the addition was completed within about 1h. The ice-water bath was removed, and the reaction was continued for 16 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium s...

Embodiment 2

[0061] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0062]In a 250mL three-necked flask, add 30g of hydroxypropyl silicone oil (molecular weight: 4000g / mol), 3.2g of triethylamine and 40ml of THF, place in an ice-water bath, and pass argon gas into the flask for 60min to remove the air. Slowly add a mixture of 7g of 2-bromoisobutyryl chloride and 40ml of tetrahydrofuran dropwise in a constant pressure dropping funnel, and finish adding within about 1h. The ice-water bath was removed, and the reaction was continued for 24 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium sulfate to the obtained upper laye...

Embodiment 3

[0065] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0066] (1) In a 250mL three-necked flask, add 30g of hydroxypropyl silicone oil (molecular weight 4000g / mol), 3.2g of triethylamine and 40ml of THF, put it in an ice-water bath, and pass nitrogen into the flask for 20min to remove the air. Slowly add a mixture of 7g of 2-bromoisobutyryl chloride and 40ml of tetrahydrofuran dropwise in a constant pressure dropping funnel, and finish adding within about 1h. The ice-water bath was removed, and the reaction was continued for 48 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium sulfate to the obtained upper ...

technical field

[0001] The invention relates to a method for preparing a polymer film with hydrophilic and antifouling properties, more specifically, a polymer film with amphiphilic polymer blending modification and its surface amphiphilic ionization and its preparation method . Background technique

[0002] In the process of membrane water treatment, polymer separation membranes used for nanofiltration or ultrafiltration are often plagued by the problem of interface fouling. For example, PVDF, a commonly used membrane material, due to the presence of fluorine atoms in the molecular structure of PVDF, makes the surface energy of pure PVDF membranes lower (critical surface tension γ c =25mN / m), it is non-polar, and there is no hydrogen bond between the membrane surface and water, so it has extremely strong hydrophobicity, which restricts its development in aqueous phase separation systems. In the process of water treatment, water molecules need to overcome high resistance t...

Examples

Embodiment 1

[0057] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0058] In a 250mL three-necked flask, add 30g (7.5mmol) hydroxypropyl silicone oil (molecular weight: 4000g / mol), 1.6g (15.5mmol) triethylamine and 40ml THF, place in an ice-water bath, and pass through the flask for 10min. 2 Air to remove air. A mixture of 3.5g (15mmol) 2-bromoisobutyryl bromide and 20ml tetrahydrofuran was slowly added dropwise in a constant pressure dropping funnel, and the addition was completed within about 1h. The ice-water bath was removed, and the reaction was continued for 16 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium s...

Embodiment 2

[0061] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0062]In a 250mL three-necked flask, add 30g of hydroxypropyl silicone oil (molecular weight: 4000g / mol), 3.2g of triethylamine and 40ml of THF, place in an ice-water bath, and pass argon gas into the flask for 60min to remove the air. Slowly add a mixture of 7g of 2-bromoisobutyryl chloride and 40ml of tetrahydrofuran dropwise in a constant pressure dropping funnel, and finish adding within about 1h. The ice-water bath was removed, and the reaction was continued for 24 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium sulfate to the obtained upper laye...

Embodiment 3

[0065] A kind of preparation method of amphiphilic polymer, concrete steps are:

[0066] (1) In a 250mL three-necked flask, add 30g of hydroxypropyl silicone oil (molecular weight 4000g / mol), 3.2g of triethylamine and 40ml of THF, put it in an ice-water bath, and pass nitrogen into the flask for 20min to remove the air. Slowly add a mixture of 7g of 2-bromoisobutyryl chloride and 40ml of tetrahydrofuran dropwise in a constant pressure dropping funnel, and finish adding within about 1h. The ice-water bath was removed, and the reaction was continued for 48 h at room temperature. After the reaction is complete, remove the insoluble ammonium salt by suction filtration with a Buchner funnel, spin evaporate the filtered solution to remove THF, then add n-hexane to dissolve, wash 3 times with deionized water in the separatory funnel, and remove the lower layer after layering. Dissolved in aqueous solution of triethylamine salt. Add anhydrous magnesium sulfate to the obtained upper ...

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