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A kind of inorganic-organic composite ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane, an organic technology, applied in the field of membrane separation, can solve the problem of ultrafiltration membrane water flux reduction, etc., and achieve the effect of large water flux, strong hydrophilicity and long life

Active Publication Date: 2015-08-12
昆明图尔克科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the current use of inorganic materials to improve the hydrophilicity and pollution resistance of organic ultrafiltration membranes, the water flux of ultrafiltration membranes is reduced, and an inorganic-organic composite ultrafiltration membrane and its preparation method are proposed. In order to achieve the above goals, In the present invention, the pore-forming agent is adsorbed in the diatomite with natural nano-pores for surface activation treatment, then added to the solution of the organic matrix material and mixed to form a casting solution, and then stirred and vacuum defoamed , and finally passed through casting and scraping film, immersed in a gel bath to form a film, the pore size distribution range is 10-50nm, and the water flux is 250-350L / m under the operating condition of 0.5Mpa 3 h, the ultrafiltration membrane with a retention rate of more than 95% for bacteria, the ultrafiltration membrane not only has the excellent pollution resistance, good hydrophilicity and long life of the inorganic ultrafiltration membrane, but also has the toughness of the organic ultrafiltration membrane Well, the advantage of being easy to mold

Method used

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  • A kind of inorganic-organic composite ultrafiltration membrane and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] 1) 15 parts by weight of diatomite soaked in hydrochloric acid with a mass fraction of 10% and washed with ultrasonic vibration and water was activated with 10 parts by weight of polyethylene glycol for 1-2h, so that hydroxyl groups were grafted to the surface of diatomite, increasing The activity and hydrophilicity of diatomite, after filtering and drying, add 1 weight part of ethanol to the activated diatomite, and stir for 10 minutes to make ethanol adsorb in the pores of diatomite;

[0030]2) Dissolve 10 parts by weight of polyvinyl chloride-based membrane material in 60 parts by weight of dimethylformamide to form a basement membrane solution, then add the diatomite obtained in step 1) into the basement membrane solution while stirring Add 2 parts by weight of hydroxyethyl cellulose to increase the viscosity of the basement membrane solution, so that diatomite is not easy to settle in the basement membrane solution, and is evenly dispersed to form a casting membrane...

Embodiment 2

[0033] 1) 10 parts by weight of diatomite soaked in hydrochloric acid with a mass fraction of 10% and washed with ultrasonic vibration and water was activated with 5 parts by weight of triethanolamine for 1.5h, so that hydroxyl groups were grafted to the surface of diatomite, increasing the diatomite activity and hydrophilicity, after filtering and drying, add 2 parts by weight of ethanol to the diatomite after the activation treatment, and stir for 15min to make ethanol adsorb in the pores of diatomite;

[0034] 2) Dissolve 15 parts by weight of polyacrylonitrile base film material in 70 parts by weight of dimethyl acetyl press to form a base film liquid, then add the diatomite obtained in step 1) into the base film liquid, and stir Add 2-3 parts by weight of polyacrylate to increase the viscosity of the basement membrane liquid, so that the diatomite is not easy to settle in the basement membrane liquid, disperses evenly, and forms a casting membrane liquid;

[0035] 3) Perf...

Embodiment 3

[0037] 1) 15 parts by weight of diatomite soaked in hydrochloric acid with a mass fraction of 10% and washed with ultrasonic vibration and water was activated with 8 parts by weight of glycerol for 2 hours, so that hydroxyl groups were grafted to the surface of diatomite, increasing the diatomite activity and hydrophilicity, after filtering and drying, add 3 parts by weight of ethylene glycol into the diatomite after activation treatment, and stir for 20min to make ethylene glycol adsorb in the pores of diatomite;

[0038] 2) Dissolve 20 parts by weight of polyether ketone base film material in 80 parts by weight of N-methylpyrrolidone to form a base film liquid, then add the diatomite obtained in step 1) into the base film liquid, and stir Add 3 parts by weight of polyurethane to increase the viscosity of the base film liquid, so that the diatomite is not easy to settle in the base film liquid, and is evenly dispersed to form a casting film liquid;

[0039] 3) Perform mechani...

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Abstract

The invention relates to an inorganic-organic composite ultrafiltration membrane and a preparation method thereof. The preparation method particularly comprises the steps: adsorbing a pore-forming agent into diatomite which is subjected to surface activation and is provided with natural nano filtration holes, then adding the diatomite into an organic dissolving solution of a fundamental mode material, mixing to form a casting solution, then carrying out stirring and vacuum defoaming, finally carrying out treatment by virtue of a flow casting scraping membrane, and immersing into a gel bath to form the ultrafiltration membrane, wherein the pore size distribution range is 10-50 nm, and the water flux of the ultrafiltration membrane under the operation condition of 0.5Mpa is 250-350 L / m<3>?h. The inorganic-organic composite ultrafiltration membrane has the characteristics of an inorganic ultrafiltration membrane of excellent pollution resistance, good hydrophilia and long service life, also has the advantages of an organic ultrafiltration membrane of good tenacity and easiness in forming and has wide application value.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to an inorganic-organic composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] Ultrafiltration technology is a kind of membrane filtration method. Ultrafiltration is a membrane technology that uses static pressure difference as the driving force to separate according to the difference in relative molecular mass. Symmetrical microporous structure and semi-permeable membrane medium, a new type of membrane separation technology driven by the pressure difference on both sides of the membrane The unique 0.01 ~ 0.1um pore size of the ultrafiltration membrane can effectively retain bacteria, most viruses, colloids and sludge, In order to achieve the purpose of separation, classification, purification and concentration, the ultrafiltration process has the characteristics of no phase change, large separation coefficient, operating temperature aro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/30B01D71/42B01D71/38B01D71/34B01D67/00
Inventor 陈庆曾军堂
Owner 昆明图尔克科技有限公司