Hydrophilic polyethene microporous membrane and preparation method thereof

Abstract

The invention provides a hydrophilic polyethene microporous membrane and a preparation method thereof, belonging to a polyethene microporous membrane containing blending compatilizer with a polar group, calcium carbonate and thinner and a preparation method thereof. In the preparation method of the microporous membrane, polyethene, blending compatilizer, calcium carbonate and thinner are taken as raw materials; and hydrophilic polyethene microporous membrane is finally prepared by blending processing, membrane pressing by a flat bed presser, quenching by water bath in constant temperature, extracting by extracting agent, acid cleaning, washing and drying. The invention is characterized in that the blended compatilizer with a polar group is selected to react with the calcium carbonate particles, calcium carbonate particles are evenly filled into polyurethane base body through blending processing; and porous structures are formed by the thermal induced phase separation method and the method for removing fillings by acid cleaning. As for the hydrophilic polyethene microporous membrane prepared by the method, the range of the internal average aperture is 0.1-10mu m, the aperture rate is greater than 50% and the contact angle is less than 80 degrees.

Description

technical field [0001] The invention relates to a hydrophilic polyethylene microporous membrane and a preparation method thereof. Background technique [0002] Polyolefin microporous membrane has strong hydrophobicity and is easily polluted during use, resulting in a decrease in its separation ability and increased cleaning costs, thus limiting its practical application in the membrane separation process. At present, the preparation of hydrophilic and surface functionalized polyolefin microporous membrane materials has become one of the research hotspots in this field. The main methods reported at present are: 1) surface grafting treatment method, using chemical, photochemical, radiation, plasma grafting and other methods, that is, grafting acrylic acid, methacrylate, methyl methacrylate on the polyolefin microporous membrane Polymers such as esters can be used to obtain hydrophilic film materials. Nie Junlan reported in Chinese Patent No. 101241985A that the polyolefin mi...

AI Technical Summary

Problems solved by technology

However, the preparation of hydroxylated polypropylene requires special comonomers and more complicated post-treatment processes, and its practical application will be limited.

Xu Youyi et al reported in Chinese patent 1654113A that the use of hydrophilic substances (cellulose materials, polyethylene glycol, hydrophilic inorganic nanomaterials such as nano-silicon dioxide, nano-titanium dioxide, etc.) and polyethylene melt blending, Then the hydrophilized modified polyethylene hollow fiber microporous membrane is prepared by melt spinning-stretching technology, but the compatibility of hydrophilic substances with polyethylene is poor, which will have an adverse effect on the properties of the blend