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JP-7855314-B2 - Grafted polysulfone membrane

JP7855314B2JP 7855314 B2JP7855314 B2JP 7855314B2JP-7855314-B2

Inventors

  • ジャービル， ジャド アリ
  • ジョカ， アルケタ
  • リー， サクサータ

Assignees

  • インテグリス・インコーポレーテッド

Dates

Publication Date
20260508
Application Date
20210208
Priority Date
20150626

Claims (6)

  1. A grafted polysulfone film comprising one or more monomers grafted onto one or more surfaces of a film, wherein the monomers are selected from anionic monomers and cationic monomers, (i) a water flow rate of the grafted polysulfone membrane is at least 75% of the water flow rate of the ungrafted polysulfone membrane, and (ii ) a dye binding ability between 1 μg/ cm² and 5 μg/ cm² , wherein the dye is methylene blue or Ponceau S, and the anionic monomer is one or more of vinyl sulfonic acid or sodium vinyl sulfonate, 2-ethyl acrylic acid, 2-carboxyethyl acrylate, 3-sulfopropyl potassium acrylate, 2-propyl acrylic acid, 2-(trifluoromethyl)acrylic acid, 2-methyl-2-propene-1-sulfonate sodium salt, mono-2-(methacryloyloxy)ethyl maleate, and 3-sulfopropyl potassium methacrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 3-methacrylamidophenylboronic acid, vinyl sulfonic acid, and vinylphosphonic acid, and the cationic monomer is 2-(dimethylamino)ethyl acrylate hydrochloride, [2-(acryloyloxy)ethyl A grafted polysulfone membrane comprising one or more of the following: trimethylammonium chloride, 2-aminoethyl methacrylate hydrochloride, N-(3-aminopropyl) methacrylate hydrochloride, 2-(dimethylamino)ethyl methacrylate hydrochloride, [3-(methacryloylamino)propyl]trimethylammonium chloride solution, [2-(methacryloyloxy)ethyl]trimethylammonium chloride, acrylamidopropyltrimethylammonium chloride, 2-aminoethyl methacrylamide hydrochloride, N-(2-aminoethyl)methacrylamide hydrochloride, N-(3-aminopropyl)methacrylamide hydrochloride, diallyldimethylammonium chloride, allylamine hydrochloride, vinylimidazolium hydrochloride, vinylpyridinium hydrochloride, and vinylbenzyltrimethylammonium chloride .
  2. The grafted polysulfone film according to claim 1, wherein one or more monomers are anionic monomers.
  3. The grafted polysulfone film according to claim 1, wherein one or more monomers are cationic monomers.
  4. A grafted polysulfone film according to claim 1, comprising one or more monomers grafted onto one or more surfaces of the film, The water flow rate is at least 75% of the water flow rate of the non-grafted polysulfone membrane, The grafted polysulfone film according to claim 1, wherein the grafted monomer is a cationic monomer comprising one or more of the following: 2-(dimethylamino)ethyl acrylate hydrochloride, [2-(acryloyloxy)ethyl]trimethylammonium chloride, 2-aminoethyl methacrylate hydrochloride, N-(3-aminopropyl) methacrylate hydrochloride, 2-(dimethylamino)ethyl methacrylate hydrochloride, [3-(methacryloylamino)propyl]trimethylammonium chloride solution, [2-(methacryloyloxy)ethyl]trimethylammonium chloride, acrylamidopropyltrimethylammonium chloride, 2-aminoethyl methacrylamide hydrochloride, N-(2-aminoethyl)methacrylamide hydrochloride, N-(3-aminopropyl)methacrylamide hydrochloride, diallyldimethylammonium chloride, allylamine hydrochloride, vinylimidazolium hydrochloride, vinylpyridinium hydrochloride, and vinylbenzyltrimethylammonium chloride.
  5. The grafted polysulfone film according to claim 1 or 4 , wherein the longitudinal brittleness does not exceed 30% of the longitudinal, cross-web, or both brittleness of the non-grafted polysulfone film.
  6. A grafted polysulfone membrane according to claim 1 or 4 , having a bubble point between approximately 65 psi and approximately 75 psi when measured by an ethoxy-nonafluorobutane bubble point test.

Description

Related Application This application claims the benefit of U.S. Provisional Patent Application No. 62/185222, filed on 26 June 2015. The entire teachings of the above application are incorporated herein by reference with due attribution. Chemical liquids are useful in various manufacturing processes. In some applications, such as semiconductor manufacturing, chemical liquids must be filtered to remove particulate impurities. Porous membranes are typically prepared from chemically compatible and mechanically stable polymer matrices and can have measurable capture capacity, pore size or pore size distribution, and thickness. The pore size can be selected according to the particle size or type of impurities to be removed in the application, as well as pressure drop and viscosity requirements. In use, porous membranes are generally inserted into a fluid flow and incorporated into equipment adapted to remove particles, microorganisms, or solutes from the process fluid. Particles filtered from the liquid may be neutrally charged, or positively or negatively charged. Fluid filtration or purification is typically performed by passing a process fluid through a membrane filter under a differential pressure across the membrane, creating a higher pressure zone upstream than downstream. During filtration, the liquid experiences pressure loss across the porous membrane, and the membrane is subjected to mechanical stress. This pressure difference can also cause dissolved gases to precipitate from the liquid. The liquid upstream of the porous membrane has a higher concentration of dissolved gases than the liquid downstream. This occurs because gases, such as air, have greater solubility in liquids at higher pressures than in liquids at lower pressures. As the liquid passes from upstream to downstream of the porous membrane, dissolved gases can be released from the solution, potentially creating bubbles in the liquid and/or on the surface of the porous membrane. This gas precipitation is commonly referred to as liquid outgassing. Therefore, there is a need for improved membranes capable of filtering chemical liquids, particularly membranes capable of filtering charged particles from chemical liquids. This specification describes a method for producing grafted polysulfone films. The method includes the steps of: contacting a polysulfone film with an alcohol solution containing a type II photoinitiator; contacting the polysulfone film with an aqueous exchange solution; contacting the polysulfone film with an aqueous grafting solution; and exposing the polysulfone film to electromagnetic radiation to produce a grafted polysulfone film. The grafting solution may contain anionic or cationic monomers, sodium sulfate, and sodium persulfate. The anionic monomer can be one or more of the following: 2-ethyl acrylic acid, acrylic acid, 2-carboxyethyl acrylate, potassium sulfopropyl acrylate, 2-propyl acrylic acid, 2-(trifluoromethyl)acrylic acid, methacrylic acid, sodium 2-methyl-2-propene-1-sulfonate, 1-[2-(methacryloyloxy)ethyl] maleate, potassium sulfopropyl methacrylate, 2-acrylamido-2-methyl-1-propanesulfonic acid, 3-methacrylamidophenylboronic acid, vinylsulfonic acid, and vinylphosphonic acid. In some cases, the anionic monomer is vinylsulfonic acid or sodium vinylsulfonate. The cationic monomer can be one or more of the following: 2-(dimethylamino)ethyl acrylate hydrochloride, [2-(acryloyloxy)ethyl]trimethylammonium chloride, 2-aminoethyl methacrylate hydrochloride, N-(3-aminopropyl) methacrylate hydrochloride, 2-(dimethylamino)ethyl methacrylate hydrochloride, [3-(methacryloylamino)propyl]trimethylammonium chloride solution, [2-(methacryloyloxy)ethyl]trimethylammonium chloride, acrylamidopropyltrimethylammonium chloride, 2-aminoethyl methacrylamide hydrochloride, N-(2-aminoethyl)methacrylamide hydrochloride, N-(3-aminopropyl)methacrylamide hydrochloride, diallyldimethylammonium chloride, allylamine hydrochloride, vinylimidazolium hydrochloride, vinylpyridinium hydrochloride, and vinylbenzyltrimethylammonium chloride. In some cases, the cationic monomer is diallyldimethylammonium chloride. Alcoholic solutions may contain type II photoinitiators. Benzophenone is a non-limiting example of a type II photoinitiator. While not intended to be theoretically limiting, type II photoinitiators undergo bimolecular reactions such that the excited state of the photoinitiator interacts with a second molecule (e.g., a polysulfone polymer chain) to generate free radicals. Alcoholic solutions may contain isopropyl alcohol. Aqueous exchange solutions may contain chaotropic salts such as sodium sulfate. Aqueous exchange solutions may contain type I photoinitiators. While not intended to be theoretically limiting, type II photoinitiators undergo monomolecular bond cleavage upon UV irradiation, yielding free radicals. Various persulfates, such as sodium persulfate and potassium persulfate, are non-limiting examples of type I photoinitiators. In so