| 主权项 |
1. A method for preparing a composite material, the method comprising:
(1) compounding a dispersion solution of an ion exchange resin containing a free radical initiator and a high-valence metal compound, with a functional monomer-grafted porous fluoropolymer membrane with a microporous structure by performing solution pouring, tape casting, screen printing process, spraying, or impregnating process; (2) subjecting a wet membrane to heat treatment at from 30 to 300° C., wherein the free radical initiator initiates a crosslinking reaction between the porous membrane and the resin to obtain the composite material; wherein a solvent used in the processes of solution pouring, tape casting, screen printing, spraying, impregnating and other processes, is selected from one or more of a group consisting of dimethylformamide, dimethylacetamide, methylformamide, dimethylsulfoxide, N-methylpyrrolidone, hexamethylphosphoric acid amine, acetone, water, ethanol, methanol, n-propanol, isopropanol, ethylene glycol and/or glycerol; preparation is performed under the following conditions: concentration of the resin dispersion solution from 1 to 80%, temperature of heat treatment from 30 to 300° C., and time of heat treatment from 1 to 600 minutes; the acidic crosslinking catalyst is added in an amount of from 0.1 to 1 wt % of the resin, wherein the ion exchange resin is prepared by copolymerization of fluorine-containing olefins, fluorine-containing olefin monomers comprising a functional group and fluorine-containing olefin monomers containing a crosslinking site and/or mixtures of the above-obtained copolymers, and has an EW value of from 600 to 1,300; the number average molecular weight of said resin is from 150,000 to 450,000; wherein the fluorine-containing olefin monomer containing a functional group is one or more selected from a group consisting of substances as defined in the following formula (II) and/or formula (III) and/or formula (IV) wherein a, b, c are an integer of 0 or 1, respectively, but a, b and c are not zero at the same time; d is an integer of from 0 to 5; n is 0 or 1; Rf1, Rf2, Rf3 are selected from perfluorinated alkyl or chlorofluorinated alkyl, respectively; X is selected from F or Br; Y1, Y2, Y3 are selected from SO2M, COOR3 or PO(OR4)(OR5), respectively, wherein M is selected from F, Cl, OR, or NR1R2; R is selected from methyl, ethyl or propyl, or selected from H, Na, Li, K or ammonium; R1 and R2 are selected from H, methyl, ethyl or propyl, respectively; R3 is selected from H, Na, Li, K, ammonium, methyl, ethyl or propyl; and R4, R5 are selected from H, Na, Li, K, or ammonium, respectively; the fluorine-containing olefin monomer containing a crosslinking site is one or more selected from a group consisting of substances as defined in the following formula (V) and formula (VI): wherein a′, b′, c′ are 0 or 1, respectively, but a′+b′+c′≠0; X1 is selected from F or Br; n′ is 0 or 1; and Rf4, Rf5, Rf6 are selected from perfluorinated alkyl, respectively. |
