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Method for preparing high-density polyethylene/ethylene-vinyl acetate blended hydrophobic microporous membranes

A technology of ethylene vinyl acetate and high-density polyethylene, applied in the field of membrane separation, to achieve the effect of easy operation, low crystallinity and high rejection rate

Inactive Publication Date: 2018-01-23
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on HDPE / ethylene vinyl acetate blended hydrophobic microporous membrane at home and abroad

Method used

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  • Method for preparing high-density polyethylene/ethylene-vinyl acetate blended hydrophobic microporous membranes
  • Method for preparing high-density polyethylene/ethylene-vinyl acetate blended hydrophobic microporous membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weighing by weight: 70 parts of diphenyl ether diluent, 30 parts of other materials (high-density polyethylene / ethylene vinyl acetate / nucleating agent dibenzylidene sorbitol, mass ratio is 22.125 / 7.375 / 0.5;

[0021] (2) Add the mixed raw materials weighed in step (1) into the reactor, pass through nitrogen protection, heat to 180° C., stop stirring after 4 hours, let stand for 2 hours for degassing, and obtain a homogeneous casting solution;

[0022] (3) Apply the casting solution obtained in (2) to the surface of the polyester non-woven fabric and scrape it into a flat shape, the temperature of the scraped film is 180°C, and then enter it into a 25°C water tank to cool and solidify;

[0023] (4) Ultrasonic extraction of the film obtained in step (3) with an anhydrous ethanol extractant with a purity of 99.7% for 24 hours, and after the extraction is completed, put it in a vacuum oven at 30°C to dry to obtain a high-density polyethylene / ethylene acetic acid Ethyle...

Embodiment 2

[0026] (1) Weighing by weight: 70 parts of diphenyl ether diluent, 30 parts of other materials (high-density polyethylene / ethylene vinyl acetate / nucleating agent dibenzylidene sorbitol, mass ratio is 24.58 / 4.92 / 0.5;

[0027] (2) Add the mixed raw materials weighed in step (1) into the reactor for stirring, pass through nitrogen protection, heat to 200° C., stop stirring after 4 hours, let stand for 4 hours for defoaming, and obtain a homogeneous casting film solution;

[0028] (3) Apply the casting solution obtained in (2) on the surface of the polyester non-woven fabric and scrape it into a flat shape. The temperature of the scraping film is 200°C, and then enter it into a 45°C water tank to cool and solidify

[0029] (4) Ultrasonic extraction of the film obtained in step (3) with an anhydrous ethanol extractant with a purity of 99.7% for 24 hours, and after the extraction is completed, put it in a vacuum oven at 50°C to dry to obtain a high-density polyethylene / ethylene ace...

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Abstract

The invention discloses a method for preparing high-density polyethylene / ethylene-vinyl acetate blended hydrophobic microporous membranes. The method is characterized in that the high-density polyethylene / ethylene-vinyl acetate blended hydrophobic microporous membranes comprise, by weight, 10-50 parts of high-density polyethylene, 1-30 parts of ethylene-vinyl acetate, 50-80 parts of diluents and 0-4 parts of nucleating agents. The method for preparing the high-density polyethylene / ethylene-vinyl acetate blended hydrophobic microporous membranes which are blended membranes is a thermally induced phase separation method. The method has the advantages that obvious modification effects can be realized for the blended membranes under the condition that the excellent chemical properties and thehigh strength of the high-density polyethylene are not changed; the mechanical performance of the membranes which are products can be greatly enhanced, and the membranes are excellent in flexibility,high in breaking elongation and long in service life; the ethylene-vinyl acetate is added, accordingly, the membrane pore sizes are narrow and uniform in distribution, the pore sizes and the porosityare easy to control, the pore sizes range from 0.1 micrometer to 1 micrometer, and the porosity is higher than 62%; the heat conductivity coefficients of the membranes which are the products can be lowered, the method can be applied to membrane distillation procedures, accordingly, the temperature difference of two sides of each membrane and the vapor pressure difference can be increased, heat loss can be reduced, and the heat efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a high-density polyethylene / ethylene vinyl acetate blended hydrophobic microporous membrane and a preparation method thereof. Background technique [0002] Hydrophobic microporous membranes can be used as the transfer medium of membrane contactors in a variety of new membrane separation processes, including membrane distillation, membrane extraction, membrane absorption, membrane stripping, and membrane adsorption. Compared with other membrane separation technologies, membrane distillation (MD) has the advantage that it can be operated at low temperature and normal pressure, and the effective use of cheap energy (such as solar energy, industrial waste heat, waste heat) has great potential in today's increasingly energy-constrained society. competitiveness. MD has a great advantage in concentrating high-concentration saline solution. In the reverse osmosis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/02B01D67/00
Inventor 唐娜华欣欣李昭张蕾程鹏高杜威项军
Owner TIANJIN UNIV OF SCI & TECH
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