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Preparation method of degradable polylactic acid microporous membrane

A polylactic acid, microporous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of being unsuitable for large-scale production and high cost, avoiding void collapse, improving yield, The effect of mild reaction conditions

Active Publication Date: 2015-09-09
常州龙骏天纯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow fiber method uses artificially synthesized hollow fibers as the porogen, which is expensive and not suitable for large-scale production

Method used

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  • Preparation method of degradable polylactic acid microporous membrane
  • Preparation method of degradable polylactic acid microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of silica sol: Mix tetrahydrofuran and ethyl orthosilicate at a volume ratio of 1:1, then add 1ml of deionized water, stir at high speed for 1-3 hours, after stirring evenly, adjust the pH to obtain a stable silica sol ;

[0025] (2) Preparation of polylactic acid silica / hybrid film: add the 10% silica sol prepared in step (1) to the corresponding tetrahydrofuran organic reagent dissolved in 20% polylactic acid in a dropwise manner, and heat up Stir at 50°C for 24 hours. After stirring, completely degas the casting solution, scrape a layer of liquid film on a clean iron plate, and dry the liquid film in a vacuum oven at 40°C until the solvent is completely evaporated. Curing and peeling off the glass plate automatically to obtain polylactic acid silica / hybrid film.

[0026] (3) Preparation of polylactic acid microporous membrane: soak the polylactic acid silicon dioxide / hybrid membrane in step (2) in hydrofluoric acid with a concentration of 20% for 24 ...

Embodiment 2

[0028] (1) Preparation of silica sol: Mix chloroform and methyl orthosilicate at a volume ratio of 1:1.2, then add 2ml of deionized water, stir at high speed for 2 hours, after stirring evenly, adjust the pH to obtain a stable silica sol .

[0029] (2) Preparation of polylactic acid silica / hybrid film: add the 10% silica sol prepared in step (1) to the corresponding chloroform organic reagent dissolved in 15% polylactic acid in a dropwise manner , raise the temperature to 40°C, and stir thoroughly for 24 hours. After stirring, the casting solution is completely degassed, and a layer of liquid film is scraped on a clean iron plate, and the liquid film is dried in a vacuum oven at 40°C until the solvent is completely evaporated. , the film is cured and automatically peeled off the glass plate to obtain the polylactic acid silica / hybrid film.

[0030] (3) Preparation of polylactic acid microporous membrane: the step (2) polylactic acid silicon dioxide / hybrid membrane is placed i...

Embodiment 3

[0032] (1) Preparation of silica sol: Mix dimethyl sulfoxide and propyl orthosilicate at a volume ratio of 1:1.5, then add 3ml of deionized water, stir at high speed for 3 hours, after stirring evenly, adjust the pH to obtain stable silica Sol.

[0033] (2) Preparation of polylactic acid silica / hybrid membrane: 5% silica sol prepared in step (1) was added dropwise to the corresponding dimethyl sulfoxide organic reagent dissolved in 10% polylactic acid In the process, heat up to 80°C and stir thoroughly for 24 hours. After stirring, the casting solution is completely degassed, and a layer of liquid film is scraped on a clean iron plate, and the liquid film is dried in a vacuum oven at 80°C until the solvent is completely evaporated. , the film is cured and automatically peeled off the glass plate to obtain the polylactic acid silica / hybrid film.

[0034] (3) Preparation of polylactic acid microporous membrane: soak the polylactic acid silicon dioxide / hybrid membrane in step (2...

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Abstract

The invention discloses a preparation method of a degradable polylactic acid microporous membrane. The preparation method comprises following steps: (1) an organic reagent is dissolved in a silicon source reagent, deionized water is added, an obtained mixture is subjected to high speed stirring to be uniform, and pH value is adjusted so as to obtain a stable silicon dioxide sol; (2) the silicon dioxide sol is added into the organic reagent containing polylactic acid dropwise, an obtained solution is stirred to be uniform, an obtained casting membrane solution is subjected to complete defoaming, a layer of liquid membrane is prepared on the surface of a clean plate via scrapping, and is dried so as to obtain a polylactic acid silicon dioxide hybrid membrane; and (3) the polylactic acid silicon dioxide hybrid membrane is immersed into hydrofluoric acid, and is taken out from hydrofluoric acid after complete etching of silicon dioxide is realized, an obtained product is washed with deionized water, and an target product is obtained via drying. According to the preparation method, sol-gel method is adopted to prepare the polylactic acid silicon dioxide hybrid membrane, the microporous structure is obtained via etching, silicon dioxide is taken as the support particle, collapse caused in pore forming processes is avoided, material yield is increased, and production cost is reduced indirectly.

Description

technical field [0001] The invention relates to a preparation method of a high molecular polymer, in particular to a preparation method of a degradable polylactic acid microporous membrane. Background technique [0002] The biodegradability of polylactic acid is one of its important properties. Compared with plastic products such as polyvinyl chloride, polyethylene, and polystyrene, the raw materials of polylactic acid are easy to obtain, come from nature, and have good biodegradability , biocompatibility, bioabsorbability and resource renewability, does not depend on petroleum resources, waste products after use can be completely decomposed, no pollution, is a completely natural cycle of biodegradable polymer materials, known as It is the most promising new packaging material and biomedical material in the new century. These special properties of polylactic acid make it a new research hotspot in the field of membranes in recent years. [0003] At present, the preparation ...

Claims

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Application Information

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IPC IPC(8): B01D71/48B01D67/00
Inventor 支朝晖李炳健
Owner 常州龙骏天纯环保科技有限公司