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Modified cellulose acetate film as well as preparation method and application thereof

A cellulose acetate membrane and cellulose acetate technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high salt concentration, difficult recycling, waste, etc., achieve high desalination rate, avoid Secondary pollution, the effect of simple method

Active Publication Date: 2017-11-24
CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Irrigation wastewater is difficult to recycle due to factors such as high salt concentration and high pH, ​​resulting in waste
This has become one of the contradictions in improving the efficient use of water resources in saline-alkali land in arid and semi-arid areas

Method used

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  • Modified cellulose acetate film as well as preparation method and application thereof
  • Modified cellulose acetate film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1, preparation and application of modified cellulose acetate membrane

[0056] Weigh 1.5kg of cellulose acetate phthalate, 1kg of cellulose acetate propionate, 5.1kg of dimethylformamide, 4.9kg of acetone, 310g of dimethylaminostyrene, 228g of 2-vinylpyridine, 50g of aldehyde, 61g of glutaraldehyde, 256g of diethylenetriamine, 58g of ammonium cerium nitrate, 53g of p-toluenesulfonic acid, 21g of stannous octoate, and 143g of zinc chloride were added to the stirring container in order to dissolve, and the temperature was set to 40 ℃, stirring time is 15h. The above solution was degassed, the degassing temperature was kept at 35° C., the degassing time was 3 hours, and the casting solution was obtained after uniform dispersion. Apply the prepared casting solution on a glass plate, and use a scraper to evenly scrape the film material to form a 183 μm thick bottom film layer. The bottom film layer on the glass substrate is placed at a temperature of 40 ° C and a...

Embodiment 2

[0057] Embodiment 2, preparation and application of modified cellulose acetate membrane

[0058] Weigh cellulose acetate tetrahydrophthalate 1.3kg, cellulose acetate methyl tetrahydrophthalate 0.2kg, cellulose acetate hexahydrophthalate 0.5kg, N-methyl Aqueous morpholine solution (13%wt) 9.0kg, maleic acid 220g, methacrylic acid 600g, sulfuric acid 60g, PEG-600 60g, lactic acid 60g, add in order to stir and dissolve in the stirring container, set the temperature at 55°C, stir The time is 24h. The above solution was defoamed, the defoaming temperature was kept at 40° C., the defoaming time was 3 hours, and the casting solution was obtained after uniform dispersion. Apply the prepared casting solution on a glass plate, and use a scraper to evenly scrape the film material to form a 250 μm thick bottom film layer. Place the bottom film layer on the glass substrate at a temperature of 40 ° C and a relative humidity of Incubate in a 70% incubator for 5 minutes. Place the base fil...

Embodiment 3

[0059] Embodiment 3, preparation and application of modified cellulose acetate membrane

[0060] Weigh 1.5kg of cellulose acetate, 1.1kg of cellulose acetate nadicate, 10.9kg of acetone, 210g of 2-hydroxyethyl methacrylate, 100g of 4-hydroxybutyl acrylate, 400g of hexamethylene diisocyanate, phosphoric acid 75g, 48g of pyridine, 88g of dibutyltin dilaurate, and 150g of glycerin were added to the stirring vessel in sequence and stirred to dissolve, the temperature was set at 55°C, and the stirring time was 24h. The above solution was defoamed, the defoaming temperature was kept at 40° C., the defoaming time was 3 hours, and the casting solution was obtained after uniform dispersion. Apply the prepared casting solution on a glass plate, and use a scraping machine to evenly scrape the film material to form a 300 μm thick bottom film layer, and place the bottom film layer on the substrate at a temperature of 40 ° C and a relative humidity of 70 % incubator for 5 min. Place the b...

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Abstract

The invention discloses a modified cellulose acetate film as well as a preparation method and application thereof. The preparation method of the modified cellulose acetate film comprises the following steps of (1) mixing and dissolving cellulose acetate materials, organic solvents, modified materials, crosslinking agents, catalysts and pore forming agents; defoaming the mixed solution to obtain film casting liquid; (2) scraping the film casting liquid onto a substrate material to form a bottom film layer; then culturing the bottom film layer; (3) putting the cultured bottom film layer into a gel bath for conversion so that the gel becomes a primary film; then, removing solvents from the primary film; performing heat treatment to obtain a modified cellulose acetate base film; (4) modifying the modified cellulose acetate base film in modification liquid to obtain the modified cellulose acetate film. The modified cellulose acetate film has the anti-corrosion performance and low cost; meanwhile, the film material is applied to farmland irrigation waste water recovery and utilization; the fast irrigation water circulation utilization of salinization land pieces is realized; the environment-benefits are good.

Description

technical field [0001] The invention relates to a modified cellulose acetate membrane and its preparation method and application, in particular to a modified cellulose acetate membrane and its preparation method and a technical scheme for the desalination, desalination and recycling of paddy field wastewater, belonging to the preparation of semipermeable membranes, Membrane separation and resource utilization of farmland wastewater. Background technique [0002] The area of ​​saline-alkali land in my country is about 36.4 million hectares, accounting for about 1 / 3 of the total cultivated land area, which has become one of the resource factors restricting the sustainable development of agriculture in my country. Among them, 40% of the saline-alkali land can be improved and utilized. The improvement and utilization of saline-alkali land can not only relieve the tension of cultivated land to a certain extent, but also ensure food security. [0003] Because rice has the charact...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00C02F9/04
CPCY02A20/131B01D71/16B01D67/0088C02F1/001C02F1/441C02F1/444C02F1/5236C02F1/56C02F1/66C02F9/00C02F2001/007
Inventor 胡树文高子登冯浩杰汪顺义任雪芹赵韵
Owner CHINA AGRI UNIV
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