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Film making liquid for polyvinyl chloride hydrophilicity alloy separating film and preparing method thereof

A polyvinyl chloride, hydrophilic technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of industrial production difficulties, low equipment manufacturing costs, decreased filtration capacity, etc., and achieve pollution cleaning and recovery. Good ability, extended cleaning cycle and life, the effect of anhydride functionality improvement

Inactive Publication Date: 2010-11-03
泉州索爱膜科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large filtration area per unit volume of the separation membrane, the equipment manufacturing cost is low, and cross-flow filtration can be realized, which greatly prolongs the service life of the filter element. However, the currently commercialized ultrafiltration membrane products generally use polysulfone (PS), polybias Materials such as ethylene dichloride (PVDF), polyaldehyde sulfone (PES), and polyacrylonitrile (PAN) cannot be widely used due to their low cost performance
[0003] Polyvinyl chloride has high physical properties, and is resistant to microbial erosion, acid and alkali resistance, good chemical stability, and has a wide range of sources, complete varieties, and low prices, so it has been valued by research units. However, due to the hydrophilicity of polyvinyl chloride itself Not good, it makes the permeability of the PVC hydrophilic alloy separation membrane poor, and it is easier to be polluted, so that the filtration capacity drops rapidly
In order to manufacture a liquid separation membrane of polyvinyl chloride with excellent performance, efforts must be made to improve its hydrophilic property after film formation. The methods that can be adopted are: ① Copolymerization modification, that is, introducing other polyvinyl chloride into the vinyl chloride chain segment by copolymerization. Chemical substances with hydrophilic groups; ②Plasma surface modification, which is to treat polyvinyl chloride powder or polyvinyl chloride film with plasma, so that chlorine-containing hydrophilic groups are generated on the surface of polyvinyl chloride powder or polyethylene film; ③surface Grafting modification, surface grafting is a kind of chemical modification of the filter membrane. Through high-energy radiation methods such as Y-rays and electron beams, the polyvinyl chloride molecular chain generates free radicals, and then introduces them on the membrane surface through graft polymerization. The required hydrophilic groups, the above three methods can improve the hydrophilicity of the polyvinyl chloride hydrophilic alloy separation membrane, but industrial production is difficult and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The membrane-making solution of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention comprises the following components in parts by weight:

[0023] PVC 12

[0024] Polyvinyl butyral 2

[0025] Maleic anhydride 1

[0026] Organotin 0.5

[0027] Dimethylacetamide 75

[0028] Polyethylene glycol 9.5

[0029] The preparation method of the film-making solution of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention is realized by the following scheme: 12 parts by weight of polyvinyl chloride resin, 2 parts by weight of polyvinyl butyral, 1 part by weight of cis Butenedioic anhydride, 0.5 parts by weight of organotin and 75 parts by weight of dimethylacetamide are poured into the reaction kettle and fully mixed and stirred. After basically dissolving, 9.5 parts by weight of polyethylene glycol are added. After stirring for 10 hours, vacuum defoaming was carried out, and the membrane-forming solution of th...

Embodiment 2

[0032] The membrane-making solution of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention comprises the following components in parts by weight:

[0033] PVC 5

[0034] Polyvinyl butyral 10

[0035] Maleic anhydride 2

[0036] Organotin 1

[0037] Dimethylformamide 79

[0038] Li salt 3

[0039] The preparation method of the film-making liquid of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention is realized by the following scheme: 5 parts by weight of polyvinyl chloride resin, 10 parts by weight of polyvinyl butyral, 2 parts by weight of cis Butenedioic anhydride, 1 weight part of organotin and 79 weight parts of dimethylformamide were poured into the reaction kettle together, stirred at a constant temperature of 80°C, and after basically dissolving, 3 weight parts of Li salt were added, and the After stirring at 80° C. for 10 hours, vacuum defoaming was carried out, and the membrane-forming solution ...

Embodiment 3

[0042] The membrane-making solution of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention comprises the following components in parts by weight:

[0043] PVC 10

[0044] Polyvinyl butyral 2

[0045] Maleic anhydride 2

[0046] Organotin 0.3

[0047] Dimethylacetamide 30.85

[0048] Dimethylformamide 30.85

[0049] Polyethylene glycol 24

[0050] The preparation method of the film-making liquid of the polyvinyl chloride hydrophilic alloy separation membrane of the present invention is realized by the following scheme: 10 parts by weight of polyvinyl chloride resin, 2 parts by weight of polyvinyl butyral, 2 parts by weight of cis Butenedioic anhydride, 0.3 parts by weight of organotin, 30.85 parts by weight of dimethylformamide, and 30.85 parts by weight of dimethylacetamide were poured into the reaction kettle together, stirred at a constant temperature of 50°C, and after basically dissolving, the Add 24 parts by weight of polyethylene g...

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Abstract

The invention discloses a membrane casting solution for PVC hydrophilic alloy separation membrane and a preparation method thereof. PVC, PVB and maleic anhydride are blended, a pore-forming agent is added dissolved and form pores. The PVC hydrophilic alloy separation membrane prepared by the membrane casting solution of the invention has the advantages of good hydrophilic property, good compatibility, high mechanical property, large water flux, strong contamination resistant ability, long service life and low application cost.

Description

technical field [0001] The invention relates to a membrane-making solution for a polyvinyl chloride hydrophilic alloy separation membrane and a preparation method thereof. Background technique [0002] Due to the characteristics of energy saving, environmental protection and simple operation of membrane separation technology, this industry has developed rapidly, and its application scope has been extended to biology, medicine, environmental protection, energy, municipal water treatment, wastewater treatment and other fields. Due to the large filtration area per unit volume of the separation membrane, the equipment manufacturing cost is low, and cross-flow filtration can be realized, which greatly prolongs the service life of the filter element. However, the currently commercialized ultrafiltration membrane products generally use polysulfone (PS), polybias Materials such as ethylene dichloride (PVDF), polyaldehyde sulfone (PES), and polyacrylonitrile (PAN) cannot be widely us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/30
Inventor 吴特殊
Owner 泉州索爱膜科技开发有限公司
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