SU1327519A1 - Semipermeable porous membrane - Google Patents

Abstract

This invention relates to membrane separation technology for liquid systems and can be used in the manufacture of porous materials. The invention makes it possible to increase the functional properties of membranes by a factor of 2-3 by using as the active layer a copolymer of tetrafluoroethylene and vinylideneftride or its mixture with 0.1-2.5% by weight of other fluorine-containing polymers, and as a substrate for fibrous materials on the basis of polypropylene or nylon with a mass ratio of the substrate and the actin layer of 1: 0.2-G, 3. 1 tab.

Description

The invention relates to a membrane technology for separating liquid liquids, and thus can be used in the manufacture of semi-permeable porous material.

The aim of the invention is to improve the functional properties of the membrane.

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Example 22. For comparison, the semipermeable membrane of Example I is made without a substrate.

Examples 1-9. A semi-permeable porous membrane consisting of an active working layer connected

with a fibrous substrate, is obtained as follows. According to a known method, a copolymer of ninylidenefluanone with porisride with tetrafluoroethylene (f-42) is dissolved in ma.h. acetone, then, with stirring, 7.3 mech is added. water and 13.5 ma.ch, propanol. The solution is filtered and deaerated, applied

Examples 23-24. For lx, a semipermeable ME is known by its known substrate and without it.

Formula of the invention

The semi-permeable porous membrane, which includes an active working layer made of a fluorine-containing polymer and a fibrous porous substrate, is distinguished by a porous fibrous oxide, the structure characteristics of which are given in the table.

The mass ratio of the densities of the working layer and the fibrous substrate is 1: 0.4-1.2. /

Examples 10-16. The semi-permeable porous membrane of example 1, but the active working layer is made of a mixture of a copolymer of tetrafluoroethylene and vinylidene fluoride With a copolymer of vinyl, lidene fluoride and hexafluoropropylene or of tetrafluoroethyl copolymer

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Lena and vinylidene fluoride with a copolymer of vinylidene fluoride and trifluorochloroethylene in the ratios indicated in the table. .

Examples The semi-permeable porous membrane of example 1, but the mass ratio of the substrate and the active layer is 1; 0.2-1.3;

Example 22. For comparison, the semipermeable membrane of Example I is made without a substrate.

The semipermeable membrane is made by a known method with porous

Examples 23-24. For lx, a semipermeable ME is known by its known substrate and without it.

Formula of the invention

Nena by a known method with porous

A semi-permeable porita membrane comprising an active working layer made of a fluorine-containing polymer and a fibrous porous substrate is also distinguished by the fact that, in order to enhance the functional properties of the membrane, the active layer is made of a copolymer of tetrafluoroethylene and vinylidene fluoride or a mixture of a copolymer of tetrafluoroethylene and vinylidene fluorine with -2.5 May. / With other fluorinated polymers, the fibrous substrate is made of polypropylene or nylon with a mass ratio of the substrate and the active layer of 1: 0.2-1.3.

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Claims (1)

Claim A semi-permeable porous membrane comprising an active working layer of a fluorine-containing polymer and a fibrous porous substrate, characterized in that, in order to increase the functional properties of the membrane, the active layer is made of a copolymer of tetrafluoroethylene and vinylidene fluoride or a mixture of a copolymer of tetrafluoroethylene and vinylidene fluoride with 0.1-2.5 ma.X other fluorine-containing polymers, the fibrous substrate is made of polypropylene or kapron with a mass ratio of the substrate and active layer of 1: 0.2-1.3. • T 42 Woven material TU 17 1 2-19 75 Application of V 1 layer-membranes * on the basis of lavsan of the RSFSR was not formed - patient 67Z and hlonkh * 33Z. 52-10230-57 the number of defects .. 'Application and ate * pore size of the membrane " <l o »A 0 “-“ О ъ ”в - * © о ί I Μ - Μ Ϊ4 «* © © § and "η * * ΖΛ N U Mt? g. Ο " <4 A © V5 Ο A Ο η "4 Η a " 1 1 1 i ¢ 0 14 03 t * in w about a a • · ♦ · a • a Ο © 0 ABOUT © © about • Μ / © η Th Η <η I • 4 rt 0 "G" s 1 1 1 in 1 1 g t * <$ ¢ 4 & FROM* r> mid f <h a Th | I a «© about . © 0 about about tt ABOUT © N ABOUT about "E ₽ N - a . · § Gh 3 3 0 «> 4 Ф <л F 1 8 s f i § $ in ·* 3 3 oh chg 3 3 3 but F f f f f h> - X A ά X • X ; in> X J) Δ f 1 /· f ? f b in 1  # 1 1 1 1