Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
  • D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
  • D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
  • D06M14/26—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin
  • D06M14/28—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
  • D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
  • D06M14/26—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin
  • D06M14/30—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M14/32—Polyesters

Definitions

• the invention relates to a method of grafting functional chemical groups on a textile substrate, as well as a textile substrate and a battery separator grafted by implementing such a method.
• the invention is particularly applicable to the grafting of textile substrates so as to give them an ion exchange function.
• the invention provides a method of grafting a bipolar textile substrate, that is to say comprising a different ion exchange function on each of its faces.
• the grafted textile substrates according to the invention are particularly useful in the agri-food, pharmaceutical, medical, energy, biological and environmental fields.
• the use of textile ion exchange substrates according to the invention allows:
• the implementation of the known methods poses the problem of removing the solvent and ungrafted chemical substances that are contained in the textile substrate, as well as the problem of their subsequent recycling.
• the aim of the invention is to overcome the problems of the prior art by proposing a process for grafting functional chemical groups onto a textile substrate which is particularly simple and adaptable in its implementation, said method also making it possible to obtain quality bipolar textile substrates.
• the invention provides a method of grafting functional chemical groups on a textile substrate, said method providing for impregnating said substrate with a solution of a functional molecule comprising the functional chemical group and a reactive group under ionizing radiation, said solution further comprising a surfactant molecule which is capable of improving the wettability of the textile substrate by said solution, said surfactant molecule comprising at least two types of reactive groups under ionizing radiation, said method providing for the application of ionizing radiation to the textile substrate impregnated for, by reaction of the reactive groups, ensuring the grafting of the functional molecules by bridging with the surfactant molecules.
• the invention proposes a textile substrate of which at least one surface is grafted with functional chemical groups, said grafting being carried out by bridging with a surfactant molecule by means of such a process.
• the invention provides a battery separator comprising a textile substrate on which are grafted sulfonic groups and phosphoric and / or carboxylic groups, said grafting being carried out by bridging with at least one surfactant molecule by means of a such a method.
• the invention relates to a method of grafting functional chemical groups on a textile substrate, in particular functional chemical groups capable of exchanging cations or anions with their environment, in particular with a medium in which the textile substrate is disposed.
• the method provides for impregnating the textile substrate with a solution of a functional molecule comprising the functional chemical group and a reactive group under ionizing radiation.
• the solution may be at least partially in the form of an emulsion.
• the impregnation is performed by padding, the impregnated textile substrate being dried prior to the application of ionizing radiation.
• the reactive groups may comprise an unsaturated bond which, under the effect of ionizing radiation, forms a reactive free radical.
• the reactive groups under ionizing radiation are chosen from the group comprising hydroxyl, carboxyl, carbonyl, acrylate, methacrylate, allyl, amine, amide, imide and urethane groups.
• the chemical cation exchange group is chosen from the group comprising sulphonic, carboxylic and phosphoric groups, the chemical cation exchange group being chosen from the group comprising amino and ammonium groups.
• the functional molecule is chosen from the group comprising sulphoalkyl methacrylates (in particular sulphopropyl methacrylate), acrylates or alkyl carboxylic methacrylates (in particular acrylic acid), alkyl phosphoric methacrylates and ethylene glycol methacrylate.
• sulphoalkyl methacrylates in particular sulphopropyl methacrylate
• acrylates or alkyl carboxylic methacrylates in particular acrylic acid
• alkyl phosphoric methacrylates and ethylene glycol methacrylate.
• the solvent of the solution is water, for example the concentration of functional molecule is between 0.5 and 1 M.
• the solution can comprise other agents, in particular for improving the solubility of the molecules and / or the stability of said solution.
• the textile substrate is based on fibers made of synthetic material, in particular polyolefinic material, as is frequently imposed by the applications envisaged for grafted textile substrates.
• the fibers may be polypropylene, polyethylene, polyester, polyvinyl alcohol or polytetrafluoroethylene (PTFE), or a mixture of these different fibers.
• the substrate may comprise a nonwoven web, for example having a thickness of between 0.2 and 5 mm and a weight of between 30 and 600 g / m 2 .
• the textile substrate may be formed of at least one woven or knitted layer.
• the grafting method according to the invention can also be implemented with textile substrates made of natural fibers, such as cotton or wool, or artificial fibers, such as viscose or cellulose.
• the method provides, for improving the wettability of the textile substrate by the solution, that said solution further comprises a surfactant molecule.
• said solution further comprises a surfactant molecule.
• the nature and quantity of the surfactant molecules in the solution are provided so that the surface tension of the solution is similar to that of the fibers.
• the textile substrate can be impregnated with a large volume of solution, so as to increase the density of functional chemical groups which are grafted onto the textile substrate.
• the surfactant molecules used comprise at least two types of reactive groups under ionizing radiation, which types may be identical or different from each other and identical or different from that of the functional molecule.
• the reaction of the reactive groups ensures the grafting of the functional molecules by bridging with the surfactant molecules.
• the reactions of the reactive groups make it possible to connect the surfactant molecules to the fibers or to each other, as well as the functional molecules to the surfactant molecules or directly to the fibers. A network is thus created between the fibers, the functional molecules and the surfactant molecules which is particularly resistant to the chemical and mechanical stresses that the grafted textile substrate will have to undergo in the context of its use.
• the ionizing radiation is electron bombardment whose power and duration can be modulated to activate the reactive groups optimally.
• the grafting process is particularly flexible in that the nature of the surfactant molecule can be chosen as a function of the textile substrate, in particular as a function of its surface tension, whereas the nature of the functional molecule is chosen as a function of the functional chemical group to be grafted.
• the surfactant molecule may be difunctional by comprising two types of reactive groups, for example the surfactant molecule may be chosen from the group comprising diacrylates, in particular polyethylene glycol diacrylate glycols (PEG DA).
• PEG DA polyethylene glycol diacrylate glycols
• PTFE fibers 1 PEG600 DA is particularly satisfactory and, with the high density polyethylene fibers, the use of PEG200 DA is satisfactory.
• the surfactant molecule can be trifunctional by comprising three types of reactive groups, for example the surfactant molecule can be chosen from the group comprising triacrylates, especially ethoxylated trimethylolpropane triacrylates.
• the surfactant molecule can be chosen from the group comprising triacrylates, especially ethoxylated trimethylolpropane triacrylates.
• ethoxylated trimethylolpropane triacrylate is particularly suitable.
• the textile substrate After the application of the ionizing radiation, the textile substrate can be washed and then dried or undergo other treatments necessary for its subsequent use. In addition, prior to grafting, the textile substrate may undergo particular treatments, in particular to improve its cohesion and / or its wettability.
• the solution comprises two functional molecules each comprising a different functional chemical group, the application of the ionizing radiation being arranged to graft each of the functional chemical groups on one side of the textile substrate, respectively.
• the method is arranged to graft the textile substrate to a determined depth so as to form a surface layer of graft material.
• the textile substrate comprising two faces which are each grafted with a different functional chemical group.
• the textile substrate may have an anion exchange face and a cation exchange face.
• the ionizing radiation is applied to each of the faces, with a penetration thickness of said radiation which is less than the thickness of the textile substrate.
• the application of the radiation can be carried out in a passage on each side of the textile substrate and the power of the ionizing radiation is modulated to obtain the appropriate penetration thickness.
• the textile substrate can be grafted on one half of its thickness with anion exchange groups, and on the other half with cation exchange groups.
• the grafting method makes it possible to produce a battery separator comprising a textile substrate, in particular formed of a nonwoven web of synthetic fibers, on which are grafted sulfonic groups and phosphoric and / or carboxylic groups.
• the grafting is carried out by bridging with at least one surfactant molecule as described above.
• the battery is of the nickel metal hydride type which has good energy performance but has the defect of generating ammonium ions during recharge / discharge cycles.
• the ammonium ions pollute the electrodes and therefore reduce the rate of recharging of the battery.
• the battery life is decreased.
• the battery separator according to the invention is remarkable in that it incorporates:
• the trapping function of the ammonium ions which are produced during the electrochemical operation of the battery.

Landscapes

• Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Cell Separators (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38445663

Family Applications (1)

Country Status (8)

Families Citing this family (9)

Family Cites Families (7)

• 2007
  • 2007-01-29 FR FR0700593A patent/FR2911883B1/fr not_active Expired - Fee Related
• 2008
  • 2008-01-28 JP JP2009546792A patent/JP2010516916A/ja active Pending
  • 2008-01-28 WO PCT/FR2008/000098 patent/WO2008110681A1/fr active Application Filing
  • 2008-01-28 US US12/522,590 patent/US20100058542A1/en not_active Abandoned
  • 2008-01-28 EP EP08761809A patent/EP2126191A1/de not_active Withdrawn
  • 2008-01-28 CA CA002672054A patent/CA2672054A1/fr not_active Abandoned
  • 2008-01-28 CN CNA2008800017876A patent/CN101600833A/zh active Pending
  • 2008-01-28 RU RU2009124413/05A patent/RU2009124413A/ru not_active Application Discontinuation

Non-Patent Citations (1)

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