Hydrophilic porous membrane and method for producing hydrophilic porous membrane
A manufacturing method and technology of porous membrane, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve problems such as gas leakage, inability to determine defect integrity, etc., and achieve the effect of high water permeability
Active Publication Date: 2021-10-01
FUJIFILM CORP
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Problems solved by technology
At this time, if the filter membrane is not wetted by water and there are pores that are not blocked by water, even if there is no defect when pressure is applied, the gas will leak, and the presence or absence of the defect cannot be judged (integrity)
That is, if the filter membrane is hydrophobic, it is difficult to accurately confirm the presence or absence of defects through the integrity test
Method used
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Embodiment
[0148] Hereinafter, examples and comparative examples are given to further specifically describe the characteristics of the present invention. Materials, usage amounts, ratios, processing contents, processing procedures, etc. shown in the following examples can be appropriately changed within the scope not departing from the gist of the present invention. Therefore, the scope of the present invention should not be limitedly interpreted by the specific examples shown below.
[0149] [Preparation of hydrophilic solution]
[0150] NISSO HPC H grade (molecular weight: 1 million), M grade (molecular weight: 700,000), SL grade (molecular weight: 100,000), and SSL grade (molecular weight: 40,000) manufactured by NIPPON SODA CO., LTD. . As the hydroxyethyl cellulose, SANHEC M grade (molecular weight: 720,000) and L grade (molecular weight: 90,000) manufactured by Sansho Co., Ltd. were used. Either of the above was added to pure water so as to have a mass % concentration described i...
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Abstract
The invention provides a hydrophilic porous membrane that includes a porous membrane and a hydroxyalkyl cellulose supported on the porous membrane; and a method for producing the hydrophilic porous membrane. The two surfaces of the porous membrane have different average pore diameters. The hydroxyalkyl cellulose, which is distributed in the thickness direction of the hydrophilic porous membrane, shows two detection intensity peaks in GPC. Between those peaks, the weight average molecular weight (Mwmin) of the peak that is detected last is less than 100,000. The method for producing a hydrophilic porous membrane comprises separately preparing a hydrophilic liquid containing a hydroxyalkyl cellulose having a lower weight average molecular weight and a hydrophilic liquid containing a hydroxyalkyl cellulose having a higher weight average molecular weight, and sequentially coating both surfaces or one surface of the porous membrane with these hydrophilic liquids.
Description
technical field [0001] The invention relates to a hydrophilic porous membrane and a method for manufacturing the hydrophilic porous membrane. Background technique [0002] Porous membranes made of polymers are industrially useful as filtration membranes for water purification and the like, and products that are pleated and housed in cartridges of a certain capacity are commercially available. Typically, filter cartridges are integrity tested to identify defects such as pinholes or poor seals. In the integrity test, air pressure is applied after water is passed through a filter membrane installed in a filter to fill pores with water and leakage of gas is observed. At this time, if the filter membrane is not wetted by water and there are pores that are not blocked by water, even if there is no defect when pressure is applied, gas will leak, and the presence or absence (integrity) of the defect cannot be determined. That is, if the filter membrane is hydrophobic, it is diffic...
Claims
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IPC IPC(8): B01D69/00B01D69/10B01D69/12B01D71/12B01D71/68
CPCB01D71/68B01D67/0088B01D69/02B01D2323/02B01D2325/34B01D2325/36B01D71/12B01D69/10B01D2325/022B01D69/106B01D71/22B01D2325/023
Inventor 石井阳大梅原健志
Owner FUJIFILM CORP