Method for preparing alloy flat-sheet membrane by using low-temperature thermal induced phase separation method

A phase separation method and flat membrane technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of poor membrane pressure resistance, fewer flat membranes, and excessively large pore diameters, etc., and achieve long-term use. Effects of lifetime, small membrane pore size, and high crystallinity
CN104324618AInactive Publication Date: 2015-02-04唐山海清源科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
唐山海清源科技股份有限公司
Publication Date
2015-02-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing an alloy flat-sheet membrane by using a low-temperature thermal induced phase separation method. The method comprises the steps of blending polyvinylidene fluoride and polysulfone; mixing under stirring at a temperature of 60-150 DEG C, by using polyethylene glycol and polyvinyl pyrrolidone as additives and a normal temperature solvent of N,N-dimethyl formamide and a high temperature solvent of dibutyl phthalate as diluents; then desorbing to obtain a membrane-casting solution; and then scraping the membrane-casting solution on a non-woven fabric with a flat-sheet membrane scraper to obtain the alloy flat-sheet membrane.
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Description

technical field

[0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a method for preparing an alloy flat membrane by using a low-temperature thermotropic phase. Background technique

[0002] In the field of separation membranes, there are many types of membranes, such as hollow fiber membranes, capillary fiber membranes, tubular membranes, and flat membranes. Among them, the flat membrane is valued because of its anti-pollution, easy cleaning, long service life, and easy use in the separation field with harsh conditions. The flat film prepared by the common non-solvent-induced phase separation method has low crystallinity of the polymer after film formation, resulting in poor strength of the flat film, which is not resistant to cleaning and has a short service life. The preparation of porous membranes by thermally induced phase separation can effectively solve the shortcomings of non-solvent induced phase separation. At ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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