Fold protection for spiral filtration modules utilizing UV cured polyurethane and method of providing same

Abstract

To provide a high-performance fold protection adhesive that is rapidly curable and has good flexibility and resistance to high pH / temperature environments.SOLUTION: Dual UV and reaction curable two component adhesives comprising both acrylic and polyurethane chemistry are disclosed. The UV curable acrylate component provides a rapid cure reaction and produces a tack free surface. The mixed two component polyurethane cures to a reaction product that provides flexibility and chemical resistance. The adhesive serves as a fold protection for the spiral wound filtration module. Once cured on the membrane, the adhesive maintains integrity and adhesion to the membrane after creasing and soaking at elevated temperatures, pressures, and over a wide pH range.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates generally to materials used as reinforcing coatings for membranes used in spiral wound filtration assemblies. [Background technology]

[0002] <Brief description of related technology> Currently, industries utilize spirally wound filtration assemblies to process water, food, and beverage materials. Adhesives are widely used to assemble the membrane leaf components of these assemblies. During the rolling process of the elements, the membrane leaf typically "folds" or "folds" on the permeate tube, creating weak spots in the membrane leaf. Details of such assemblies are known, for example, from U.S. Patents 4,842,736 and 7,303,675, the contents of each of which are incorporated herein by reference in their entirety.

[0003] Adhesives have been used as coatings on folded membrane leaf areas to provide membranes with improved durability in the crease area and to prevent leaks during use. In some applications, membrane assemblies are subjected to daily cleaning with strong chlorine solutions or high-temperature (70-85°C) and high-pH (11.0-12.5) solutions. Adhesives used for crease protection must be resistant to these cleaning solutions, high temperature, and high pH conditions and must maintain their mechanical integrity without cracking or peeling from the membrane material.

[0004] Currently, two types of adhesives are used as fold protection materials: one is a curable two-component polyurethane adhesive, and the other is a curable acrylate adhesive. Polyurethanes have good flexibility and resistance to high pH / temperature environments, but require long curing times (8 hours to several days). The long curing time limits polyurethane adhesives to offline processes when manufacturing folded membrane packs. UV-curable acrylate adhesives have been proposed for use as fold protection materials. Some acrylate adhesives are too brittle for this use. 1) More flexible acrylate adhesives cannot achieve a tack-free surface under short UV exposure, and 2) easily lose membrane integrity and adhesion under the required high temperature and pH conditions, resulting in membrane delamination. As a result, neither two-component polyurethane adhesives nor acrylate adhesives are optimal for membrane fold protection. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, there is a need for high performance crease protectant adhesives that are fast curing and have good flexibility and resistance to high pH / temperature environments. [Means for solving the problem]

[0006] (overview) One aspect of the present disclosure provides a hybrid two-component dual-cure adhesive. The adhesive combines two-component reactive-cure polyurethane chemistry and UV-cure acrylate chemistry. The hybrid adhesive provides a tack-free surface after short-cycle exposure to UV radiation, reduces shrinkage, and increases flexibility. The hybrid adhesive also has increased resistance to cleaning solution treatments operating at high temperatures and high pH. In the adhesive, the proportions of polyurethane and acrylate are adjusted to optimize UV ​​cure, chemical resistance, and cost.

[0007] Another aspect of the present disclosure provides a membrane leaf having a hybrid two-component dual-cure adhesive applied over the folding area.

[0008] Another aspect of the present disclosure provides a method of applying a hybrid two-component dual-cure adhesive to a membrane fold area.

[0009] In general, unless expressly stated otherwise, the disclosed materials and methods can alternately be formulated to comprise, consist of, or consist essentially of any suitable components, moieties, or steps disclosed herein. The disclosed materials and methods may additionally or alternatively be formulated to be free of, or substantially free of, any components, ingredients, constituents, adjuvants, moieties, species, and steps used in prior art compositions, and which are not necessary to achieve the function and / or purpose of the present disclosure. [Brief explanation of the drawings]

[0010] Reference is made to the drawings in which like elements are numbered alike in the several drawings. [Figure 1] FIG. 1 is a schematic diagram of one embodiment of a wound filtration assembly. [Figure 2] FIG. 1 is a schematic cross-sectional view of a membrane. [Figure 3] FIG. 2 is a schematic cross-sectional view of a filtering leaf. [Figure 4] FIG. 1 is a schematic diagram of a cut membrane having a curable composition applied adjacent to a fold. [Figure 5] FIG. 10 is a schematic diagram of a cutting membrane folded around a feed spacer. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Detailed explanation] Unless otherwise limited, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. For each of the various embodiments, as used herein, the following definitions apply:

[0012] The singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise.

[0013] When about or "approximately" is used herein in connection with a numerical value, it refers to the numerical value ±10%, preferably ±5%, more preferably ±1% or less.

[0014] As used herein, "at least one" means one or more, i.e., 1, 2, 3, 4, 5, 6, 7, 8, 9, or more. With respect to components, this designation refers to the type of component, not the absolute number of molecules. Thus, "at least one polymer," for example, means at least one type of polymer, i.e., one type of polymer or a mixture of several different polymers can be used.

[0015] As used herein, the terms "comprising," "comprises," and "comprised of" are synonymous with "including," "includes," "containing," or "contains," and are inclusive or open-ended and do not exclude additional, unrecited members, elements, or method steps.

[0016] When expressing amounts, concentrations, dimensions, and other parameters in the form of ranges, preferred ranges, upper limits, lower limits, or preferred upper limits and limits, it is to be understood that any range obtained by combining any upper or preferred value with any lower limit or preferred value is also specifically disclosed, regardless of whether the resulting range is expressly stated in the context.

[0017] The term "preferably" is often used herein to refer to embodiments of the present disclosure that may offer certain benefits, under certain circumstances. However, the recitation of one or more preferred or preferred embodiments does not imply that other embodiments are not useful or to exclude these other embodiments from the scope of the present disclosure.

[0018] One-component or one-part (1K) compositions are the only formulations that have sufficient commercial stability to be prepared, stocked, and shipped to end users. 1K compositions can be used without the addition of additional components and crosslink or cure when exposed to the appropriate conditions. As used herein, two-component or two-part (2K) compositions have two or more components. Each component is prepared, stocked, and shipped separately from the other components. The components are mixed immediately before use. Mixing of the components initiates the curing reaction, so commercial storage after mixing is not possible.

[0019] Unless otherwise specified, all percentages quoted in connection with the compositions described herein refer to weight percent (wt %) with respect to the final composition of all components for one-part (1K) compositions, or with respect to the final composition of all components in the reference part for two-part (2K) compositions.

[0020] Alkyl refers to a monovalent group containing carbon and hydrogen atoms, e.g., 1 to 8 carbon atoms, i.e., an alkane group, including straight-chain and branched forms. Examples of alkyl groups include, but are not limited to, methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, and 2-ethylhexyl. In the present invention, such alkyl groups may be unsubstituted or optionally substituted. Preferred substituents include one or more groups selected from halo, nitro, cyano, amido, amino, sulfonyl, sulfinyl, sulfanyl, sulfoxy, urea, thiourea, sulfamoyl, sulfamido, and hydroxy. Halogenated derivatives of the above exemplary hydrocarbon groups may be particularly mentioned as examples of suitable substituted alkyl groups. Preferred alkyl groups include unsubstituted alkyl groups containing 1 to 6 carbon atoms (C1-C6 alkyl), e.g., unsubstituted alkyl groups containing 1 to 4 carbon atoms (C1-C4 alkyl).

[0021] Alkylene means a divalent group containing carbon atoms, e.g., 1-20 carbon atoms, i.e., an alkane group, and includes linear and branched organic groups that may be substituted or unsubstituted. Preferred alkylene groups include those containing 1-12 carbon atoms (C1-C 12 alkylene)--includes, for example, unsubstituted alkylene groups containing 1-6 carbon atoms (C1-C6 alkylene) or 1-4 carbon atoms (C1-C4 alkylene).

[0022] An alkenyl group refers to an aliphatic carbon group containing, for example, 2-20 carbon atoms, preferably 2-10 carbon atoms, and more preferably 2-6 carbon atoms, and at least one double bond. The alkene may be an allyl group. The alkene may contain one or more conjugated double bonds. Like the alkyl group, the alkenyl group may be linear, branched, or cyclic, and may be unsubstituted or optionally substituted. Examples of C2-C8 alkenyl groups include, but are not limited to, allyl, isoprenyl, 2-butenyl, and 2-hexenyl.

[0023] "Alkoxy" refers to the structure -OR, where R is hydrocarbyl.

[0024] "Alkyne" or "alkynyl" refers to a hydrocarbon chain or group containing one or more triple bonds between carbon atoms in the chain. The alkyne can be a straight hydrocarbon chain or a branched hydrocarbon group. The alkyne may be cyclic. The alkyne may contain 1-20 carbon atoms, preferably 1-10 carbon atoms, and more preferably 1-6 carbon atoms. The alkyne may contain one or more conjugated triple bonds. In some embodiments, the alkyne can be substituted.

[0025] By "amine" is meant a molecule containing at least one -NHR group, where R can be a covalent bond, H, hydrocarbyl, or polyether. In some embodiments, the amine can contain multiple -NHR groups (which may be referred to as a polyamine).

[0026] "Aryl" or "Ar," used alone or as part of a larger moiety, as an "aralkyl group," refers to unsubstituted or optionally substituted monocyclic, bicyclic, and tricyclic ring systems in which the monocyclic ring system is aromatic, or at least one ring in the bicyclic or tricyclic ring system is aromatic. Bicyclic and tricyclic ring systems include benzo-fused 2- to 3-membered carbocyclic rings. Representative aryl groups include phenyl, indenyl, naphthalenyl, tetrahydronaphthyl, tetrahydroindenyl, tetrahydroanthracenyl, and anthracenyl.

[0027] Acrylate refers to the monovalent -OC(O)-C=C moiety. Methacrylate refers to the monovalent -OC(O)-C(CH3)=C moiety. (Meth)acrylate refers to acrylate and methacrylate.

[0028] Acryloyl (ACR) refers to the -C(O)-C=C moiety. Methacryloyl (MCR) refers to the -C(O)-C(CH3)=C moiety. (Meth)acryloyl refers to acryloyl and methacryloyl groups.

[0029] "Ester" means the structure RC(O)-O-R', where R and R' are independently selected hydrocarbyl groups with or without heteroatoms. The hydrocarbyl groups can be substituted or unsubstituted.

[0030] "Halogen" or "halide" means an atom selected from fluorine, chlorine, bromine, and iodine.

[0031] "Hetero" refers to one or more heteroatoms in a structure. Exemplary heteroatoms are independently selected from N, O, and S, atoms other than carbon or hydrogen, such as nitrogen, oxygen, phosphorus, or sulfur. The phrase "interrupted by at least one heteroatom" means that the main chain of the residue contains at least one heteroatom as a chain member.

[0032] "Heteroaryl" refers to a monocyclic or polycyclic aromatic ring system in which one or more ring atoms in the structure is a heteroatom. Exemplary heteroatoms are independently selected from N, O, and S. The cyclic rings can be connected by a bond or fusion. A heteroaryl can contain from 5 to about 30 carbon atoms, advantageously 5-12 carbon atoms, and in some embodiments, 5-6 carbon atoms. Exemplary heteroaryls include furyl, imidazolyl, pyrimidinyl, tetrazolyl, thienyl, pyridyl, pyrrolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, thiazolyl, quinolinyl, and isoquinolinyl. In some embodiments, a heteroaryl is substituted.

[0033] "Hydrocarbyl" means a group containing carbon and hydrogen atoms. The hydrocarbyl can be a linear, branched, or cyclic group. The hydrocarbyl can be an alkyl, alkenyl, alkynyl, or aryl. In some embodiments, the hydrocarbyl is substituted.

[0034] "Molecular weight" means weight average molecular weight unless otherwise specified. The number average molecular weight Mn and weight average molecular weight Mw are determined according to the present invention by gel permeation chromatography (GPC, also known as SEC) at 23°C using a styrene standard. This method is known to those skilled in the art. Polydispersity is obtained from the average molecular weights Mw and Mn. It is calculated as PD = Mw / Mn. Polydispersity indicates the width of the molecular weight distribution and therefore the different degrees of polymerization of individual chains in a polydisperse polymer. For many polymers and polycondensates, a polydispersity value of about 2 applies. Strict monodispersity exists at a value of 1. A low polydispersity, for example, less than 1.5, indicates a relatively narrow molecular weight distribution.

[0035] "Oligomer" means a defined small number of repeating monomer units, such as 2-5,000 units, advantageously 10-1,000 units, polymerized to form a molecule. Oligomer is a subset of the term polymer.

[0036] "Polyether" refers to a polymer containing multiple ether groups (each ether group containing an oxygen atom bonded to two hydrocarbyl groups) in the main polymer chain. The repeating units in the polyether chain may be the same or different. Representative polyethers include homopolymers such as polyoxymethylene, polyethylene oxide, polypropylene oxide, polybutylene oxide, and polytetrahydrofuran, as well as copolymers such as poly(ethylene oxide-copropylene oxide) and EO-tipped polypropylene oxide.

[0037] "Polyester" means a polymer containing multiple ester bonds. Polyesters can be either linear or branched.

[0038] "Polymer" refers to any polymerization product having a chain length and molecular weight greater than that of an oligomer. A polymer can have a degree of polymerization of from about 20 to about 25,000. As used herein, polymer includes oligomers and polymers. Polymerization conditions refer to reaction conditions suitable for combining monomers into a polymer.

[0039] "Polyol" means a molecule containing two or more -OH groups. Polyols may also have other functional groups on the molecule. The term "polyol" encompasses a single polyol or a mixture of two or more polyols.

[0040] By room temperature is meant a temperature of about 22-25°C.

[0041] "Substituted" means that there are one or more substituents present on the molecule at any available position. Useful substituents are those that do not significantly impair the disclosed reaction scheme. Examples of substituents include, for example, H, halogen, (meth)acrylate, epoxy, oxetane, urea, urethane, N3, NCS, CN, NCO, NO2, NX 1 X 2 ,OX 1 , C(X 1 )3, C(halogen)3, COOX 1 ,SX 1 , Si(OX 1 ) i X 2 3-i , alkyl, alcohol, alkoxy, wherein X 1 and X 2 each independently comprises H, alkyl, alkenyl, alkynyl, or aryl, and i is an integer from 0 to 3.

[0042] By "thiol" is meant a molecule that contains at least one -SH group. In some embodiments, a thiol can contain multiple -SH groups (which may be referred to as a polythiol).

[0043] The adhesive can include one or more multifunctional polyols. As used herein, a multifunctional polyol is a molecule having two or more OH groups and, optionally, other functional groups. Multifunctional polyols include aromatic polyester and polyether polyols, aliphatic polyester and polyether polyols, polypropylene glycol polyols, castor oil-based polyols, polycaprolactone polyols, and polycarbonate polyols from various suppliers, such as INVISTA, BASF, Huntsman, Univar, and Bayer. The multifunctional polyols can have a MW of 60 g / mol to 6,000 g / mol. In some embodiments, the multifunctional polyols can have a MW of 140 g / mol to 4,000 g / mol.

[0044] The multifunctional polyol can include a short-chain polyol. The short-chain polyol typically has a MW of less than 1000 g / mol, preferably 60 g / mol-1,000 g / mol. Useful short-chain polyols include ethanediol, propanediol, and butanediol.

[0045] The adhesive can include one or more (meth)acrylate monomers. The (meth)acrylate monomers include monofunctional (meth)acrylate monomers, polyfunctional (meth)acrylate monomers, and combinations thereof. The monofunctional (meth)acrylate monomers can be selected from monofunctional alkyl (meth)acrylates, monofunctional alkenyl (meth)acrylates, and monofunctional heterocyclo (meth)acrylates, where alkyl is an alkyl group having 1-20 carbon atoms, optionally having one or more substituents; alkenyl is an alkenyl group having 2-20 carbon atoms, optionally having one or more substituents; and heterocycle is a heterocyclic group having 2-20 carbon atoms and a heteroatom selected from nitrogen and oxygen, optionally having one or more substituents, which may be selected from alkyl groups having 1-20 carbon atoms, alkyloxy groups having 1-20 carbon atoms, aryloxy groups having 6-20 carbon atoms, cycloalkyloxy groups having 3-20 carbon atoms, and hydroxyl.

[0046] The polyfunctional (meth)acrylate monomer can be selected from polyfunctional alkyl (meth)acrylates, polyfunctional alkenyl (meth)acrylates, and polyfunctional heterocyclo (meth)acrylates, wherein the alkyl is an alkyl group having 1-20 carbon atoms which may have one or more substituents, the alkenyl is an alkenyl group having 2-20 carbon atoms which may have one or more substituents, and the heterocyclo is a heterocyclic group having 2-20 carbon atoms which may have one or more substituents and having a heteroatom selected from nitrogen and oxygen, wherein the one or more substituents may be selected from an alkyl group having 1-20 carbon atoms, an alkyloxy group having 1-20 carbon atoms, an aryloxy group having 6-20 carbon atoms, a cycloalkyloxy group having 3-20 carbon atoms, and a hydroxyl group.

[0047] Representative examples of (meth)acrylate monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofurfuri (meth)acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2-phenoxyethyl acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, caprolactone acrylate, morpholine (meth)acrylate, hexanediol di(meth)acrylate, ethylene glycol dimethacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and combinations thereof.

[0048] The adhesives include polyethylene glycol di(meth)acrylate, tetrahydrofuran (meth)acrylate and di(meth)acrylate, hydroxypropyl (meth)acrylate, hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate ("TMPTMA"), diethylene glycol dimethacrylate, triethylene glycol dimethacrylate ("TRIEGMA"), benzyl methacrylate, tetraethylene glycol dimethacrylate, dipropylene glycol dimethacrylate, di-(pentamethylene glycol) di ... and one or more (meth)acrylate monomers including difunctional or trifunctional (meth)acrylates such as diglycol diacrylate, diglycerol tetramethacrylate, tetramethylene dimethacrylate, ethylene dimethacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, and bisphenol-A mono- and di(meth)acrylates, e.g., ethoxylated bisphenol-A (meth)acrylate ("EBIPMA"), bisphenol-F mono- and di(meth)acrylates, e.g., ethoxylated bisphenol-F (meth)acrylate.

[0049] The adhesive can include one or more (meth)acrylate-functionalized urethanes. Useful (meth)acrylate-functionalized urethanes include tetramethylene glycol urethane acrylate oligomers and propylene glycol urethane acrylate oligomers. Other (meth)acrylate-functionalized urethanes are urethane (meth)acrylate oligomers based on polyethers or polyesters reacted with aromatic, aliphatic, or cycloaliphatic diisocyanates and capped with hydroxyacrylates. Some useful examples include, for example, polyester of hexanedioic acid and diethylene glycol terminated with isophorone diisocyanate and capped with 2-hydroxyethyl acrylate (CAS 72121-94-9), polypropylene glycol terminated with triene-2,6-diisocyanate and capped with 2-hydroxyethyl acrylate (CAS 37302-70-8), polyester of hexanedioic acid and diethylene glycol terminated with 4,4'-methylenebis(cyclohexyl isocyanate) and capped with 2-hydroxyethyl acrylate (CAS 37302-70-8), and polyester of hexanedioic acid and diethylene glycol terminated with 4,4'-methylenebis(cyclohexyl isocyanate) and capped with 2-hydroxyethyl acrylate (CAS 37302-70-8). 69011-33-2), polyester of hexanedioic acid, 1,2-ethanediol, and 1,2 propanediol terminated with tolylene-2,4-diisocyanate and capped with 2-hydroxyethyl acrylate (CAS 69011-31-0), polyester of hexanedioic acid, 1,2-ethanediol, and 1,2 propanediol terminated with 4,4'-methylenebis(cyclohexyl isocyanate) and capped with 2-hydroxyethyl acrylate (CAS 69011-32-1), and difunctional urethane acrylate oligomers such as polytetramethylene glycol ether terminated with 4,4'-methylenebis(cyclohexyl isocyanate) and capped with 2-hydroxyethyl acrylate.

[0050] (Meth)acrylate-functionalized urethanes also include difunctional urethane methacrylate oligomers such as polytetramethylene glycol ether terminated with tolylene-2,4-diisocyanate and capped with 2-hydroxyethyl methacrylate; polytetramethylene glycol ether terminated with isophorone diisocyanate and capped with 2-hydroxyethyl methacrylate; polytetramethylene glycol ether terminated with 4,4'-methylenebis(cyclohexyl isocyanate) and capped with 2-hydroxyethyl methacrylate; and polypropylene glycol terminated with tolylene-2,4-diisocyanate and capped with 2-hydroxyethyl methacrylate.

[0051] The adhesive can contain one polyisocyanate or a mixture of different polyisocyanates. Polyisocyanates include compounds with at least two reactive isocyanate (-NCO) groups. Polyisocyanates do not have to be polymeric, but can be low molecular weight compounds or monomers.

[0052] Polyisocyanates suitable for preparing the polyurethanes of the present invention include ethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,4-tetramethoxybutane diisocyanate, 1,6-hexamethylene diisocyanate (HDI), cyclobutane-1,3-diisocyanate, cyclohexane-1,3- and -1,4-diisocyanate, bis(2-isocyanatoethyl) fumarate, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (isophorone diisocyanate, IPDI), 2,4- and 2,6-hexahydrotoluylene diisocyanate, hexahydro-1,3- or -1,4-phenylenediisocyanate, and bis(2-isocyanatoethyl) fumarate. Included are 1,6-diisocyanato-2,2,4-trimethylhexane, 1,6-diisocyanato-2,4,4-trimethylhexane, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), 1,3- and 1,4-phenylene diisocyanate, 2,4- or 2,6-toluylene diisocyanate (TDI), 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, or 4,4'-diphenylmethane diisocyanate (MDI), and isomeric mixtures thereof.Also suitable are partially or fully hydrogenated cycloalkyl derivatives of MDI, such as fully hydrogenated MDI (H12-MDI), alkyl-substituted diphenylmethane diisocyanates, such as mono-, di-, tri-, or tetraalkyldiphenylmethane diisocyanates, and their partially or fully hydrogenated cycloalkyl derivatives, 4,4'-diisocyanatophenylperfluoroethane, phthalic acid-bis-isocyanatoethyl ester, 1-chloromethylphenyl-2,4- or 2,6-diisocyanate, 1-bromomethylphenyl-2,4- or 2,6-diisocyanate, 3,3'-bis-chloromethylether-4,4'-diphenyldiisocyanate, sulfur-containing diisocyanates such as those obtained by reacting two moles of a diisocyanate with one mole of thiodiglycol or dihydroxydihexyl sulfide, diisocyanates of dimer fatty acids, or mixtures of two or more of the named diisocyanates.

[0053] Other useful polyisocyanates include modified forms of polyisocyanate monomers. Examples of useful modified polyisocyanates include, for example, carbodiimide-modified diphenylmethane diisocyanate (carbodiimide-modified MDI), allophanate-modified diphenylmethane diisocyanate (allophanate-modified MDI), biuret-modified diphenylmethane diisocyanate (biuret-modified MDI), polymeric diphenylmethane diisocyanate (polymeric MDI), and combinations thereof. The production of modified polyisocyanates is generally known, and modified polyisocyanates can be produced by known methods and / or are commercially available.

[0054] Other useful polyisocyanates include polyisocyanates having a functionality of three or more obtained, for example, by the oligomerization of diisocyanates, more particularly by the oligomerization of the isocyanates mentioned above. Examples of such tri- and higher isocyanates are the triisocyanurates of HDI or IPDI or mixtures thereof, or the polyphenylmethylene polyisocyanates obtained by phosgenation of aniline / formaldehyde condensates.

[0055] The adhesive can optionally contain one or more linking components. A linking component is a bonding molecule capable of reacting with both acrylate and isocyanate moieties present in the mixed adhesive components. Useful linking components include hydroxyl-containing (meth)acrylates, amine-containing (meth)acrylates, and isocyanate-containing (meth)acrylates. The adhesive can contain one or more hydroxyl-containing (meth)acrylates. These components can form, for example, acrylate-acrylate bonds and isocyanate-hydroxyl bonds.

[0056] Hydroxyl-containing (meth)acrylates include (meth)acrylate compounds having one or more reactive hydroxyl (OH) moieties. Some useful hydroxyl-containing (meth)acrylates include, for example, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, N-hydroxyethyl acrylamide, hydroxybutyl acrylate, hydroxypolyethoxy(10) allyl ether, 3-phenoxy-2-hydroxypropyl methacrylate, glycerol monomethacrylate, and mixtures thereof.

[0057] Amine-containing (meth)acrylates include (meth)acrylate compounds having one or more reactive amine (NH or NH) moieties. Some useful amine-containing (meth)acrylates include, for example, 2-aminoethyl methacrylate, 2-diisopropylaminoethyl methacrylate, N-(3-aminopropyl)methacrylamide, and 2-(N,N-dimethylamino)ethyl acrylate.

[0058] Isocyanate-containing (meth)acrylates include (meth)acrylate compounds having one or more reactive isocyanate (NCO) moieties and one or more (meth)acrylate moieties. Some useful isocyanate-containing (meth)acrylates include isocyanate-containing polyester urethane (meth)acrylates, polyether urethane (meth)acrylates, aliphatic urethane (meth)acrylates, and aromatic urethane (meth)acrylates available from suppliers such as Sartomer and Allnex.

[0059] The adhesive can include one or more photoinitiators. Photoinitiators increase the rapidity of the curing process when the mixed adhesive composition is exposed to actinic radiation, e.g., electromagnetic radiation such as ultraviolet (UV) radiation. Examples of some useful photoinitiators include those commercially available from Ciba Specialty Chemicals under the trade names "IRGACURE" and "DAROCUR," specifically "IRGACURE" 184 (1-hydroxycyclohexyl phenyl ketone), 907 (2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one), 369 (2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone), 500 (a combination of 1-hydroxycyclohexyl phenyl ketone and benzophenone), 651 (2,2-dimethoxy-2-phenylacetophenone), and 1700 (bis(2,6-dimethoxybenzoyl-2,4,4-trimethylpentane). Examples of photoinitiators include, but are not limited to, 819 [bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide] and "DAROCUR" 1173 (2-hydroxy-2-methyl-1-phenyl-1-propan-1-one) and 4265 (2,4,6-trimethylbenzoyldiphenylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one); and visible light [blue] photoinitiators, dl-camphorquinone and "IRGACURE" 784DC photoinitiator. Of course, combinations of these materials can also be used herein.

[0060] Other photoinitiators useful herein include alkyl pyruvates such as methyl, ethyl, propyl, and butyl pyruvate, and aryl pyruvates such as phenyl, benzyl, and appropriately substituted derivatives thereof. Photoinitiators particularly suitable for use in the present invention include 2,2-dimethoxy-2-phenylacetophenone (e.g., Irgacuré 651), and 2-hydroxy-2-methyl-1-phenyl-1-propane (e.g., Darocur 1173), bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (e.g., Irgacuré 819), and bis(2,6-dimethoxybenzoyl-2,4,4-trimethylpentyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propan-1-one (e.g., Irgacuré 1700), as well as ultraviolet photoinitiators such as the visible light initiator bis(5-2,4-cyclopentadien-1-yl)-bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]titanium (e.g., Irgacuré 784DC). Useful actinic radiation includes ultraviolet light, visible light, and combinations thereof.

[0061] Other photoinitiators useful herein include polymeric photoinitiators. Typically, these photoinitiators have a molecular weight of 600-1000 g / mol and are often referred to as oligomeric or polymeric photoinitiators. Preferably, molecular weights above 1000 g / mol are not considered toxicologically relevant. Polymeric photoinitiators include polymeric benzophenone derivatives, polymeric thioxanthone derivatives, and aminobenzoate derivatives available from suppliers such as RAHN. GENOPOL * TX-2 is a multifunctional thioxanthone derivative designed for use in UV-curable coatings and adhesives where low migration and low odor are required. * AB-2 is a multifunctional aminobenzoic acid derivative designed for use in UV-curable adhesives where low migration and low odor are required. *AB-2 can be used as a replacement for standard aminobenzoates and is insoluble in water.

[0062] Desirably, the actinic radiation used to cure the photocurable elastomeric sealant composition has a wavelength of about 200 nm to about 1,000 nm. Useful UV radiation includes, but is not limited to, UVA (about 320 nm to about 410 nm), UVB (about 290 nm to about 320 nm), UVC (about 220 nm to about 290 nm), and combinations thereof. Useful visible light includes, but is not limited to, blue light, green light, and combinations thereof. Such useful visible light has a wavelength of about 450 nm to about 550 nm.

[0063] The adhesive can include one or more catalysts. Catalysts include catalysts or cure-inducing components for modifying the reaction rate when two components are mixed. Some suitable catalysts are those commonly used in polyurethane reactions and curing, including organometallic catalysts, organotin catalysts, bismuth catalysts, zirconium catalysts, titanate catalysts, and amine catalysts. Examples of catalysts include (1,4-diazabicyclo[2.2.2]octane) DABCO® T-12 or DABCO® Crystals, available from Evonik; DMDEE (2,2'-dimorpholinyl diethyl ether); and DBU (1,8-diazabicyclo[5.4.0]undec-7-ene). The curable composition can optionally include one or more catalysts.

[0064] The adhesive may optionally contain one or more additives. The additives may be contained in either or both components. Some useful additives include fillers, thixotropes, rheology modifiers, antioxidants, reaction modifiers, thermoplastic polymers, adhesion promoters, colorants, tackifiers, plasticizers, flame retardants, diluents, reactive diluents, moisture scavengers, and combinations thereof.

[0065] The curable composition can optionally contain a filler. Some useful fillers include, for example, lithopone, zirconium silicate, hydroxides such as calcium, aluminum, magnesium, and iron hydroxides, diatomaceous earth, carbonates such as sodium, potassium, calcium, and magnesium carbonate, oxides such as zinc, magnesium, chromium, cerium, zirconium, and aluminum oxide, calcium clay, nanosilica, fumed silica, silane- or silazane-treated silica such as the AEROSIL® products available from Evonik Industries, acrylate- or methacrylate-treated silica such as AEROSIL® R7200 or R711 available from Evonik Industries, precipitated silica, untreated silica, graphite, synthetic fibers, and mixtures thereof. When used, fillers can be used in concentrations effective to provide the desired properties in the uncured composition and cured reaction product, typically from about 0% to about 90% by weight of the composition, more typically from 1% to 30% by weight of the composition. Suitable fillers include organoclays such as exfoliated graphite, such as Cloisite® nanoclays sold by Southern Clay Products and XGnP® graphene nanoplatelets sold by XG Sciences, In some embodiments, enhanced barrier properties are achieved with appropriate fillers.

[0066] The curable composition can optionally contain a thixotropic agent or rheology modifier. Thixotropic agents can alter the rheological properties of the uncured composition. Some useful thixotropic agents include silica, such as fused or fumed silica, which can be untreated or treated to alter its surface chemistry. Virtually any reinforcing fused precipitated silica, fumed silica, or surface-treated silica can be used. Examples of treated fumed silica include polydimethylsiloxane-treated silica, hexamethyldisilazane-treated silica, and other silazane- or silane-treated silicas. Such treated silicas are commercially available, such as AEROSIL®, from Cabot Corporation under the trade name CAB-O-SIL® ND-TS and from Evonik Industries under the trade name AEROSIL® R805. Also useful are acrylate- or methacrylate-surface-treated silicas, such as AEROSIL® R7200 or R711, available from Evonik Industries. Examples of untreated silica include commercially available amorphous silicas such as AEROSIL® 300, AEROSIL® 200, and AEROSIL® 130. Commercially available hydrated silicas include NIPSIL® E150 and NIPSIL® E200A manufactured by Japan Silica Kogya Inc. Rheology modifiers can be used at concentrations effective to provide desired physical properties in the uncured composition and cured reaction product, typically from about 0% to about 70% by weight of the composition, advantageously from about 0% to about 20% by weight of the composition. In certain embodiments, the filler and the rheology modifier can be the same.

[0067] The curable composition can optionally include an antioxidant. Some useful antioxidants include those commercially available from BASF under the trade name IRGANOX®. When used, the antioxidant should be present in an amount ranging from about 0 to about 15 weight percent of the curable composition, for example, from about 0.3 to about 1 weight percent of the curable composition.

[0068] The curable composition can optionally contain a reaction modifier. A reaction modifier is a substance that increases or decreases the reaction rate of the curable composition. For example, 8-hydroxyquinoline (8-HQ) and its derivatives, such as 5-hydroxymethyl-8-hydroxyquinoline, can be used to control the cure rate. When used, the reaction modifier can be used in a range of about 0.001 to about 15 wt % of the curable composition.

[0069] The curable composition can optionally contain a thermoplastic polymer. The thermoplastic polymer can be either functional or non-functional thermoplastic. Non-limiting examples of suitable thermoplastic polymers include acrylic polymers, functional (e.g., containing reactive moieties such as -OH and / or -COOH) acrylic polymers, non-functional acrylic polymers, acrylic block copolymers, acrylic polymers with tertiary alkylamide functional groups, polysiloxane polymers, polystyrene copolymers, divinylbenzene copolymers, polyetheramides, polyvinyl acetals, polyvinyl butyral, polyvinyl chloride, methylene polyvinyl ether, cellulose acetate, styrene acrylonitrile, amorphous polyolefins, olefin block copolymers [OBC], polyolefin plastomers, thermoplastic urethanes, polyacrylonitrile, ethylene acrylate copolymers, ethylene acrylate terpolymers, ethylene butadiene copolymers and / or block copolymers, styrene butadiene block copolymers, and mixtures of any of the above.

[0070] The curable composition can optionally include one or more adhesion promoters compatible and known in the art. Examples of useful commercially available adhesion promoters include aminosilanes, glycidylsilanes, mercaptosilanes, isocyanatosilanes, vinylsilanes, (meth)acrylatesilanes, and alkylsilanes. Common adhesion promoters are available from Momentive under the trade name Silquest or from Wacker Chemie under the trade name Geniosil. Silane-terminated oligomers and polymers can also be used. The adhesion promoter can be used in a range of about 0% to about 20% by weight of the curable composition, preferably in a range of about 0.1% to about 15% by weight of the curable composition.

[0071] The curable composition can optionally include one or more colorants. In some applications, a colored composition may be beneficial to allow for inspection of the applied composition. Colorants, such as pigments or dyes, can be used to provide a desired color beneficial to the intended application. Exemplary colorants include titanium dioxide, CI Pigment Blue 28, CI Pigment Yellow 53, and phthalocyanine blue BN. In some applications, fluorescent dyes can be added to allow for inspection of the applied composition under UV irradiation. The colorant will be present in an amount sufficient to allow observation or detection, for example, about 0.002% or more of the total composition. The maximum amount is influenced by cost, radiation absorption, and interference with the curing of the composition. More desirably, the colorant can be present in an amount up to about 20% by weight of the total composition.

[0072] The curable composition can optionally contain from about 0 to about 20% by weight, e.g., from about 1% to about 20% by weight of the composition, of other additives known in the art, tackifiers, plasticizers, flame retardants, diluents, reactive diluents, moisture scavengers, and combinations of any of the above, to produce desired functional properties, provided they do not significantly interfere with the desired properties of the curable composition or the cured reaction product of the curable composition.

[0073] When used as an adhesive, the curable composition can optionally contain up to 80% by weight of a suitable solvent based on the total weight of the curable composition. This type of adhesive is known as a solvent-based adhesive. After applying the curable composition to a first substrate, the solvent is rapidly evaporated, for example, by heating in an oven. A second substrate is then laminated to the curable composition-coated side of the first substrate to form a laminate structure. In other embodiments, the curable composition is substantially solvent- and / or water-free or free.

[0074] Referring to FIG. 1, a filtration assembly 30 typically includes a core or permeate carrier 32 around which multiple leaves (each 10) and other elements are spirally wound and secured. Each leaf 10 includes a membrane 12. In one embodiment, shown in FIG. 2, membrane 12 includes a thin, dense, semi-permeable layer 13, such as a polyamide membrane, on a filtration layer 14, such as polyethersulfone, on a support layer 16, such as a polyester scrim. The thin, dense, semi-permeable layer 13 defines one surface 18 of membrane 12, and support layer 16 defines the opposing surface 20 of membrane 12. The thin, dense, semi-permeable layer 13, or the thin, dense, semi-permeable layer 13 in combination with the filtration layer (14), performs the separation. In another embodiment, membrane 12 includes a filtration layer 14, such as polyethersulfone, on a support layer 16, such as a polyester scrim. The filtration layer 14 defines one surface 18 of membrane 12, and support layer 16 defines the opposing surface 20 of membrane 12. Filtration layer 14 provides the separation.

[0075] The membrane 12 is cut to the desired size from a roll of material. A fold 24 is formed in the cut membrane, as shown in FIG. 4. A curable composition 26 is mixed and applied to the cut membrane 12 adjacent to the fold 24. Adjacent to the fold area means above the fold area and extending beyond the fold for a specified distance. The curable composition can be coated onto the fold approximately 0.1-5.0 inches on either side of the fold. The curable composition is not coated onto the entire membrane surface, as this can reduce the membrane's filtration capacity and render the coated membrane unusable. The curable composition 26 can be applied adjacent to the fold 24 on either the filtration surface 18, the support layer surface 20, or both. Mixing and application of the curable composition 26 can be performed by established methods.

[0076] The applied mixture of curable composition 26 is exposed to actinic radiation, typically at ultraviolet (UV) wavelengths, to initiate a first cure. The mixed polyurethane components are then cured by reaction of the polyol and polyisocyanate materials.

[0077] 3 and 5, cut membrane 12 with the cured composition is folded along fold lines 24, and feed spacer material 22 is placed between adjacent filtration surfaces 18 of the folded membrane. Feed spacer 22 is typically a fluid-permeable polymer net-type structure. A permeate carrier 34 may be placed adjacent support surface 20. The components are wrapped around and secured to permeate carrier 34.

[0078] The filtration assembly 30 is disposed within a housing (not shown). A feed stream 36 is fed into the housing under pressure. The feed stream 36 includes at least two components. An illustrative example of a feed stream would be brine. The feed spacers 22 direct the feed stream 36 longitudinally across the filtration assembly, in contact with the filtration surface 18 of the thin, dense, semi-permeable layer 13 or filtration layer 14.

[0079] Salt-free or low-concentration water passes through membrane 10 in a generally perpendicular direction from filtration surface 18 toward support surface 20 within the filtration assembly, forming permeate stream 38 that is directed through porous permeable carrier layer 34 (not shown) into permeate tube 32. Permeate stream 38 exits permeate tube 32. The remaining portion of feed stream 36 now has a higher salt concentration, forming concentrate stream 42, which is directed out of filtration assembly 30 separately from permeate stream 38.

[0080] In the table below, the components of several embodiments of the presently disclosed adhesive composition are shown. These amounts are the weight percentage of that component based on the total adhesive weight. [Table 1]

[0081] The components are mixed into two parts. One part contains a polyisocyanate, and the other part contains a polyol, a hydroxyl-containing (meth)acrylate, and a polyurethane catalyst. The remaining materials can be placed in any desired component to maintain commercial stability. The two components are stored separately to prevent reaction. Immediately prior to use, the components are mixed to a substantial homogeneity to initiate the reaction between the polyisocyanate and the hydroxyl-containing material. During the reaction, the mixture increases in viscosity; the mixed material cannot be stored and must be used quickly before the mixture cures to an unacceptably high viscosity. In some embodiments, the mixed components will have an unacceptably high viscosity in about one hour. [Example]

[0082] The following examples are included for illustrative purposes so that the present disclosure may be more readily understood and are not intended to limit the scope of the disclosure, unless specifically indicated.

[0083] The ingredients in the table below were used in the examples. [Table 2]

[0084] The adhesive components were made using the ingredients and amounts in the table below. [Table 3]

[0085] Examples 4A, 4B, 5A and 5B were prepared by mixing the materials in the table below in the absence of moisture. [Table 4]

[0086] Comparative Samples A and B are commercially available single-component UV-cured acrylic adhesives. Comparative Sample C is a commercially available two-component polyurethane.

[0087] The samples were tested for cure, tack, flexural adhesion, and chemical resistance. The membrane used was DOW NF-245 3"X3" and a coating of the sample material was applied to the membrane surface to a thickness of approximately 0.2-0.3 mm and cured.

[0088] The sample was exposed to UV light with a wavelength of 405 nm at 1.61 W / cm 2 The UV cure was tested by exposing to 1000kJ / 2000kcal for 10 seconds. The cured sample surface was tested for tack by touch.

[0089] The reactive cure of the 3K mix was tested by mixing the two components in 30:70, 50:50, and 70:30 acrylic:polyurethane weight percent (wt%) ratios and holding at room temperature for 24 hours. The reactive cure for the integrated hybrid system was tested at a 1:1 volumetric mix ratio with a total polyurethane content of 55 wt% and 24 wt% in Samples 4 and 5. The samples were held at room temperature for 24 hours. After the sample surfaces were cured, they were tested for tack by feel.

[0090] Flexural adhesion was tested by a bend test. This test involves coating one surface of a membrane with a test composition and allowing the composition to cure. The coated membrane is first folded over so that the cured coating is on the inside of the bend, returned to the flat starting position, and folded a second time so that the cured coating is on the outside of the bend. If no cracking or delamination of the cured coating from the membrane is observed, the sample is considered to have passed.

[0091] Chemical resistance was tested using an immersion test. Samples were immersed in a 12.5 pH aqueous solution and placed in a temperature-controlled oven at 80°C. The samples were checked periodically for any deterioration or delamination and the results were recorded.

[0092] The results of the test are shown in the table below. [Table 5]

[0093] [Table 6]

[0094] Both Samples A and B can be cured under UV conditions to give a good tack-free film on the filtration membrane in less than 10 seconds.

[0095] Samples 1, 2, and 3 are three-component (3K) adhesives containing a UV-curable component and two separate polyurethane components. The three components are stored separately and mixed immediately before use to initiate cure of the polyurethane component. The polyurethane content in each sample is reduced from 70% to 30% by weight. Due to the increased PU content in Samples 1 and 2, the surface remained tacky for several hours after the initial UV cure, which is undesirable.

[0096] Samples 4 and 5 are integrated polyurethane-acrylate dual-cure two-component hybrid systems, each containing a primary UV-cure free-radical reaction with a secondary polyurethane reaction. Even with a PU content greater than 50 wt. % (Sample 4), a tack-free surface was obtained after exposure to UV light.

[0097] Samples 4 and 5 are 2K adhesives that are more convenient to use than the 3K mixtures of Samples 1, 2, and 3. Furthermore, the components of both Samples 4 and 5 are stable under commercial storage conditions for more than six months without separation of the materials in the components.

[0098] All samples passed the crease / wrinkle test, in which the membrane was bent along with the surface coating, holding the coating on the outer surface. Similarly, all samples passed the crease / wrinkle test, in which the membrane was bent along with the surface coating, holding the coating on the inner surface. No cracks or coating adhesion failures were observed on any of the samples in any of the tests.

[0099] Film samples, each coated on one surface with the cured reaction product of one of the samples, were immersed in a 12.5 pH aqueous solution and placed in a temperature-controlled oven at 80°C. After three days, Sample A lost adhesion and began to peel from the film, which would be unacceptable for use. Sample B dissolved completely in the solution, which would be unacceptable for use. Slight degradation was observed in Sample 3, which contained 70% by weight of the acrylic adhesive, which would be undesirable for use. Samples C, 1, 2, 4, and 5 showed no loss of adhesion or dissolution and maintained film integrity.

[0100] Film samples, each coated on one surface with the cured reaction product of one of the samples, were immersed in a 12.5 pH aqueous solution and placed in a temperature-controlled oven at 80°C for 10 days. After 10 days, Sample A (100% acrylic) lost all adhesion, but the film did not dissolve in the solution. This would be unacceptable for use. After 10 days, Sample 2 (50% acrylic and 50% polyurethane by weight) and Sample 3 (70% acrylic and 30% polyurethane by weight) lost all adhesion or began to show significant signs of degradation and delamination. This would be unacceptable for use. After 10 days, Sample 1 (30% acrylic and 70% polyurethane by weight), which had the highest PU weight percentage, began to show adhesion failure and the onset of delamination. This would be unacceptable for use. After 10 days, Sample 3 (100% polyurethane) showed no loss of adhesion or dissolution and maintained film integrity. However, the slow cure rate and extended tack duration of Sample 3 limits the adhesive's usefulness in many applications.

[0101] After 10 days, Samples 4 and 5 showed no loss of adhesion or dissolution and maintained their film integrity. Samples 4 and 5 were tack-free after the UV exposure period. Thus, Samples 4 and 5, which contain an integrated polyurethane-acrylate dual-cure hybrid system, have the cure speed of a light-cured acrylic without the adhesion loss and solubility issues of an acrylic adhesive, while possessing the chemical resistance of a polyurethane adhesive without the tacky cure state of a polyurethane adhesive.

[0102] It should be understood that the above description is illustrative and that variations and modifications can be made without departing from the concept and spirit of the invention as defined in the following claims.

Claims

1. a first component comprising a multifunctional polyol, optionally a short chain polyol, optionally a (meth)acrylate monomer, a urethane acrylate oligomer, a photoinitiator, a catalyst, and optionally one or more additives; a second component comprising a polyisocyanate, a (meth)acrylate monomer, a urethane acrylate oligomer, and optionally additives; Connected components that exist in the first component, the second component, or both the first and second components 1. A unitary hybrid two-component adhesive comprising: The mixed form adhesive has both a UV curing mechanism and a reaction curing mechanism, and the cured reaction product maintains adhesion to the membrane surface in a bending test, and the cured reaction product maintains adhesion to the membrane surface after 10 days of immersion testing.

2. 10. The unitary hybrid two-component adhesive of claim 1, wherein the mixed form adhesive can be cured to a surface tack-free state by exposure to UV radiation.

3. the first component comprises 2-40 wt% of a multifunctional polyol, 0-5 wt% of a short-chain polyol, 0-30 wt% of a (meth)acrylate monomer, 0-80 wt% of a urethane acrylate oligomer, a photoinitiator, a catalyst, and optionally one or more additives, the sum of all materials in the first component being 100 wt%; the second component comprises 5 to 80 wt. % of a polyisocyanate, 0 to 30 wt. % of a (meth)acrylate monomer, 0 to 80 wt. % of a urethane acrylate oligomer, and optionally additives, the sum of all materials in the second component being 100 wt. %; 10. The unitary hybrid two-component adhesive of claim 1, wherein 0 to 40 weight percent of the linking component is present in the first part, the second part, or both the first and second parts.

4. the first component comprises 10-35 wt% of a multifunctional polyol, 0.5-5 wt% of a short-chain polyol, 0-10 wt% of a (meth)acrylate monomer, 10-50 wt% of a urethane acrylate oligomer, a photoinitiator, a catalyst, and optionally one or more additives, the sum of all materials in the first component being 100 wt%; the second component comprises 20-75 wt% polyisocyanate, 0-30 wt% (meth)acrylate monomer, 5-35 wt% urethane acrylate oligomer, and optionally additives, the total of all materials in the second component being 100 wt%; 10. The unitary hybrid two-component adhesive of claim 1, wherein 20 to 40 weight percent of the linking component is present in the first part, the second part, or both the first and second parts.

5. 10. The integrated hybrid two-component adhesive of claim 1 in a mixed form coated on the surface of a filtration membrane.

6. 10. The integrated hybrid two-component adhesive of claim 1, wherein the mixed form adhesive is coated adjacent to the film folds on the film surface.

7. 10. The unitary hybrid two-component adhesive of claim 1, wherein the mixed form adhesive is coated adjacent to the membrane folds on a membrane surface, the surface being selected from polyamide, polyethersulfone, and polyester scrim.

8. 10. The integrated hybrid two-component adhesive of claim 1, wherein the mixed form adhesive is coated adjacent to the film fold on the film surface, with the remainder of the film surface being free of the mixed adhesive.

9. 10. The integrated hybrid two-component adhesive of claim 1, wherein the mixed form adhesive is coated adjacent to the membrane folds on the membrane filtration surface, the membrane support surface, or both the membrane filtration surface and the membrane support surface.

10. 10. The cured reaction product of the integrated hybrid two-component adhesive of claim 1 in a mixed form bonded to the surface of a filtration membrane.

11. 10. A filtration assembly comprising a plurality of membranes wound around a core, wherein the cured reaction product of the two-component adhesive of claim 1 in mixed form is bonded to a surface of at least one of the filtration membranes.

12. 10. A filtration assembly comprising a plurality of membranes wound around a core, wherein the cured reaction product of the two-component adhesive of claim 1 in mixed form is bonded to a surface of at least one of the filtration membranes adjacent a fold.

13. providing a first component comprising a multifunctional polyol, optionally a short chain polyol, optionally a (meth)acrylate monomer, a urethane acrylate oligomer, a photoinitiator, a catalyst, and optionally one or more additives; providing a second component comprising a polyisocyanate, a (meth)acrylate monomer, a urethane acrylate oligomer, and optionally additives; where a connected component exists in the first component, the second component, or both the first and second components, mixing the first component and the second component to initiate a first curing reaction between the polyol and the polyisocyanate to form a mixed adhesive composition; providing a membrane having a filtration surface, a support surface, and defining folds; coating the filtering surface, the support surface, or both the filtering surface and the support surface adjacent the fold with the mixed adhesive composition; A method of reinforcing a fold area of ​​a film comprising exposing the mixed adhesive composition coated on the surface of the film to actinic radiation to initiate a second curing reaction.

14. 14. The method of claim 13, wherein the cured reaction product of the mixed adhesive composition maintains adhesion to the membrane surface in a bend test, and wherein the cured reaction product maintains adhesion to the membrane surface after 10 days in an immersion test.

15. 10. Use of the integral hybrid two-component adhesive of claim 1 for coating fold areas of filtration assembly components.

Images