Polrvinyl chloride and cellulose acetate blend membrane and preparation method thereof

Abstract

The invention relates to a polrvinyl chloride and cellulose acetate blend membrane and a preparation method thereof. The blend membrane is formed by polrvinyl chloride and cellulose acetate with mass ratio of 9:1-1:9. The preparation method includes the following steps: 1 enabling polrvinyl chloride and cellulose acetate to be dissolved in a solvent, mixing until dissolved, standing, and defoaming to obtain cast membrane liquid; and 2 pouring the cast membrane liquid on a glass plate, producing liquid state thin membrane in a scraping mode, then placing in water bath, taking out from the water bath when the thin membrane falls, washing with distilled water, then soaking with glycerine solution, air drying and then obtaining the blend membrane. The preparation method is simple in process, low in cost, easy to industrialize. The polrvinyl chloride and cellulose acetate blend membrane prepared with the preparation method is good in permeability, high in water flux and high in strength, has high resistance to damage, and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of blended membranes and their preparation, in particular to a blended membrane of polyvinyl chloride and cellulose acetate and a preparation method thereof. Background technique [0002] The use of polyvinyl chloride (PVC) as a membrane material has many literature and patent reports. Zhao Fangbo, Xie Ronghua, Zhang Xiaohui and others reported hydrophilic polyvinyl chloride film and its preparation method (application number: CN101513593). The preparation technology is to use polyvinyl chloride, dissolve polyvinyl chloride solvent, vinyl acetate, nano-alumina , pore-forming agent and sodium hexametaphosphate or sodium dodecylbenzene sulfonate or citric acid, made according to weight percentage; People such as Zhu Fangqin have reported a kind of polyvinyl chloride hollow fiber membrane and preparation method thereof (application number: CN102343222A ), its preparation technology is to first synthesize styrene-vinyl a...

AI Technical Summary

Problems solved by technology

And the patent of polyvinyl chloride / cellulose acetate blend film has not been reported

[0003] Cellulose acetate (CA) has good hydrophilicity and strong anti-pollution performance, but it is not resistant to acid, alkali and bio-erosion

Polyvinyl chloride (PVC) has good physical and chemical stability, acid and alkali resistance and biological erosion, but its hydrophobicity is too strong, and it is easily polluted by organic substances such as oil and protein.

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