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Super-hydrophilic and biodegradable oil-water separation membrane and preparation method thereof

An oil-water separation membrane and super-hydrophilic technology, which is applied in the field of polyglycolic acid nanofiber oil-water separation membrane and its preparation, can solve the problem of polyglycolic acid nanofiber membrane not having hydrophilicity, low electrospinning production efficiency, and process conditions Complicated problems, to achieve the effect of improving degradation resistance, regular structure, and high spinning speed

Active Publication Date: 2019-02-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above known technologies can make polyglycolic acid nanofiber membranes, there are the following limitations: (1) under the current technical conditions, the production efficiency of electrospinning is low and the process conditions are complicated; (2) the solvent used for electrospinning: Hexafluoroisopropanol has strong polarity, high toxicity, and is not environmentally friendly; (3) the polyglycolic acid nanofibrous membrane prepared by phase separation does not possess hydrophilicity; therefore, it is necessary to develop new superhydrophilic and biodegradable The polyglycolic acid nanofiber oil-water separation membrane and its preparation method meet the higher requirements of various applications for its comprehensive performance

Method used

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  • Super-hydrophilic and biodegradable oil-water separation membrane and preparation method thereof
  • Super-hydrophilic and biodegradable oil-water separation membrane and preparation method thereof
  • Super-hydrophilic and biodegradable oil-water separation membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Take polylactic acid with a weight-average molecular weight of 600,000 and a molar content of L optical isomer of 90% and polyglycolic acid with a weight-average molecular weight of 60,000 for vacuum drying at a drying temperature of 90±5°C and a drying time of 16 hours. The water content is 40ppm; 99 kg of dried polylactic acid and 1 kg of dried polyglycolic acid are physically mixed in a high-speed mixer; the mixture is injected into a single-screw extruder to melt, and extruded through a metering pump and a spinneret hole. When the spinning temperature is 242°C and the spinning speed is 2500m / min, the polylactic acid / polyglycolic acid blended fibers with an average diameter of 50 microns are collected, and the prepared weight is 120 g / m 2 The spunlace non-woven fabric is heat-treated by passing the non-woven fabric at a speed of 6 m / min through a 6-meter-long constant-temperature hot box with a temperature of 180°C. The heat treatment time is 60 seconds, and then intr...

Embodiment 2

[0041] Take polylactic acid with a weight-average molecular weight of 60,000 and a molar content of L optical isomer of 96%, and polyglycolic acid with a weight-average molecular weight of 600,000 for vacuum drying at a drying temperature of 90±5°C and a drying time of 16 hours. The water content is 42ppm; 97 kg of dried polylactic acid and 3 kg of dried polyglycolic acid are physically mixed in a high-speed mixer; the mixture is injected into a single-screw extruder to melt, and extruded through a metering pump and a spinneret hole. When the spinning temperature is 235°C and the spinning speed is 500m / min, the polylactic acid / polyglycolic acid blended fibers with an average diameter of 80 microns are collected, and the prepared weight is 70 g / m 2 The woven fabric is heat-treated by passing the woven fabric at a speed of 12m / min through a 6-meter-long, 160°C thermostat for 30 seconds, and then introduced into a cold water bath with a temperature of 5°C. Rapid cooling to room t...

Embodiment 3

[0044] Take polylactic acid with a weight-average molecular weight of 60,000 and a molar content of L optical isomer of 88% and polyglycolic acid with a weight-average molecular weight of 100,000 for vacuum drying at a drying temperature of 90±5°C and a drying time of 16 hours. The water content is 50ppm; 95 kg of dried polylactic acid and 5 kg of dried polyglycolic acid are physically mixed in a high-speed mixer; the mixture is injected into a single-screw extruder to melt, and extruded through a metering pump and a spinneret hole. When the spinning temperature is 239 °C and the spinning speed is 4500 m / min, the polylactic acid / polyglycolic acid blended fibers with an average diameter of 10 microns are collected, and the prepared weight is 70 g / m 2 Needle-punched non-woven fabrics; the non-woven fabrics are heat-treated at a speed of 9 m / min through a 6-meter-long, 190-degree constant-temperature hot box, and the heat-treatment time is 45 seconds, and then introduced into a co...

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Abstract

The invention discloses a super-hydrophilic and biodegradable oil-water separation membrane and a preparation method thereof. A nanofiber membrane is prepared from polyglycolic acid nanofiber with a surface wrapped by a polylactic acid-glycolic acid copolymer. According to the method, polylactic acid / polyglycolic acid blend fiber is produced at a proper spinning temperature and spinning speed through preferably choosing the molecular weights of the polylactic acid and the polyglycolic acid as well as the content and mixed proportion of optical isomers. In specific conditions such as above preferential raw material ingredients and strong enough elongation flow fields, polyglycolic acid nanofiber is in situ formed in the molding process of the polylactic acid / polyglycolic acid blend fiber. The nanofiber is in situ generated in the process of melt spinning at a relatively high speed, not only are the shapes and sizes uniform, but also the degree of orientation and the degree of crystallinity are relatively high, meanwhile, the surface of the nanofiber is coated with the polylactic acid-glycolic acid copolymer, which is in situ formed through ester exchange, and the super-hydrophilic performance and degradation resistance of the oil-water separation membrane are obviously superior to the super-hydrophilic performance and degradation resistance of common polyglycolic acid nanofiber.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a superhydrophilic and biodegradable polyglycolic acid nanofiber oil-water separation membrane and a preparation method thereof. Background technique [0002] With the increasing global oil consumption and the resulting pollution events such as oil spills, more and more researchers use the surface wettability of materials (including superhydrophobic, superhydrophilic, superoleophobic, superoleophilic) Build oil-water separation materials to solve the problems of oil pollution in water areas and purification of fuel oil. According to the different wettability of the surface to oil and water, the oil-water separation material can separate two kinds of oil-water mixtures, "oil-in-water" and "water-in-oil". Among them, materials for separating "water-in-oil" mixtures are widely used because of their strong oil-water selectivity and good separation effect. The way of disposa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D69/02B01D67/00B01D17/022
CPCB01D17/0202B01D67/0002B01D69/02B01D71/48B01D2325/36
Inventor 陈鹏黄威王鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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