Preparation method of high molecule microfilter membrane and porogenic agent

A technology of polymer additives and microfiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of inconvenient storage and use of casting solution, instability of casting solution system, and microporous membrane strength. Poor and other problems, to achieve the effect of solving poor stability, conducive to large-scale commercial continuous production, and short time

Inactive Publication Date: 2008-12-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used porogens, whether they are inorganic porogens (such as lithium chloride, magnesium perchlorate, lithium perchlorate), or small molecular organic substances (such as glycerin, diethylene glycol, ethanol, oxalic acid, etc.), and polymers The compatibility of the solution is poor, and when it is added to the casting solution, it will cause strong curling and shrinkage of polymer molecular segments, forming mutually independent microphase separation (see figure 1 ), the strength of the prepared microporous membrane is poor, and the casting solution system is unstable, and even the precipitation phase separation occurs automatically, which brings a lot of inconvenience to the preservation and use of the casting solution

Method used

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  • Preparation method of high molecule microfilter membrane and porogenic agent
  • Preparation method of high molecule microfilter membrane and porogenic agent
  • Preparation method of high molecule microfilter membrane and porogenic agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Polyethersulfone (produced by Nanhu Chemical Factory of Jilin University, hereinafter referred to as PES) 15%, solvent N-methylpyrrolidone (hereinafter referred to as NMP) 60%, non-solvent porogen diacid diester 20%, polymer additive Polyvinylpyrrolidone (brand name K-30, hereinafter referred to as PVP) 5% is placed in the feed liquid tank together. Dissolve and stir into a homogeneous solution, filter, and vacuum defoam. Then adjust the temperature of the film-making room at 25°C, humidity 70%, scrape the film, control the dry phase volatilization time to 60 seconds, then immerse the nascent film in a water bath, the water bath temperature is 20°C, the casting liquid is solidified to form a film, and the film is placed in the water bath. Rinse in water at 40°C for 5-10 hours to make the casting solution completely gel, the solvent and additives flow out completely, and dry at room temperature. The surface structure of the obtained microporous membrane is as follows: ...

Embodiment 2～6

[0062] Keeping the mass ratio of the additive to the solvent constant and the content of the polymer additive constant, the casting solutions with the polymer concentrations of 8, 12, 18, 21 and 25% were prepared in sequence. Membrane was prepared in the same manner as in Example 1, and the obtained membrane performance results are listed in Table 3. Examples 2-6 illustrate that as the polymer concentration increases, the pore diameter of the membrane gradually decreases, and microporous membranes with different nominal pore sizes can be prepared by adjusting the size of the high polymer.

[0063] table 3:

[0064]

Embodiment 7～9

[0066] Change the type of solvent, and prepare polymer solutions with the same concentration with dimethylsulfoxide (DMSO), dimethylacetamide (DMAc), and dimethylformamide (DMF) solvents respectively. All the other operations were performed as in Example 1. The experimental data results are listed in Table 4. Examples 7-9 illustrate that different solvents can be used to prepare microporous membranes with a certain pore size.

[0067] Table 4:

[0068]

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Abstract

The invention relates to a method for preparing macromolecule micro filter film with phase shift method and relative holing agent. Wherein, it uses the multicomponent macromolecule homogeneous phase system of diglycolic acid maleate as the casting film solution; uses the polymer deposit (dry-wet method) method emerged into non-solvent bath to prepare the micro filter film, while the dry method costs 2mins; the micro filter film has symmetry holes, high strength and insensitivity on temperature and humidity vibration. The aperture of micro filter film is 0.1-0.80micrometer, the water osmosis is 5-150ml / cm2.min (0.1MPa), the whole rate is 70-85%. The invention has wide application.

Description

technical field [0001] The present invention relates to a kind of polymer microfiltration membrane preparation method of phase inversion method, especially relate to the film formulation of porogen diethylene glycol bismaleate (hereinafter referred to as diacid diester), adopt phase The conversion method can be used to prepare microfiltration membranes (such as polysulfones, polyvinylidene fluoride, and polyacrylonitrile microfiltration membranes), which are used in some related application fields. Background technique [0002] Polymer microfiltration membrane separation technology has developed rapidly in the past two decades, and has been widely used in various fields such as food, medicine, electronics, and environmental protection. The core of microfiltration membrane separation technology is to develop and produce high-performance microporous membranes. The preparation methods can be divided into sintering method, stretching method, track etching method and phase invers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/06B01D71/68B01D71/34B01D71/42
Inventor 张瑞丰肖通虎
Owner NINGBO UNIV
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