116 results about "Cross linked membrane" patented technology

The present invention is for high performance UV-cross-linked membranes from polymers of intrinsic microporosity (PIMs) and the use of such membranes for separations. More specifically, the invention involves the methods of making UV-cross-linked membranes from PIMs. These membranes were prepared by cross-linking the UV-cross-linkable membranes from PIMs by exposure to UV-radiation. Pure gas permeation test results demonstrate that the UV-cross-linked membranes from PIMs exhibit CO₂/CH₄ performance well above the Robeson's polymer upper bound trade-off curve for CO₂/CH₄ separation. They have more than doubled selectivity for CO₂/CH₄ and extremely high permeability of CO₂ compared to the original UV-cross-linkable membranes from PIMs. These membranes also show excellent separation performance for CO₂/N₂, H₂/CH₄, O₂/N₂, and propylene/propane separations. These high performance UV-cross-linked membranes are very useful for gas and liquid separations such as CO₂/CH₄, CO₂/N₂, H₂/CH₄, O₂/N₂, olefin/paraffin, deep desulfurization of gasoline and diesel fuels, and ethanol/water separations.

A compressible substrate coated at least in part with a waterborne coating composition comprising at least one base neutralized active hydrogen containing film-forming resin and a water dispersible carbodiimide crosslinker capable of reacting with the film-forming resin to form a crosslinked film is disclosed. An article of manufacture having at least two different flexible substrates coated at least in part with such a coating is also disclosed.

The invention provides an aqueous cosmetic composition for providing a durable crosslinked film on a keratinous substrate having at least two water-based film-form polymers including at least one water-based self-crosslinking film-form polymer. The self-crosslinking film-form polymer has functional groups capable of crosslinking with each other after the cosmetic composition is placed on the keratinous substrate. The aqueous cosmetic composition as whole forms a film on keratinous substrate that adheres to the keratinous substrate and is removable and durable.

This invention discloses a composition of, a method of making, and an application of high plasticization-resistant chemically cross-linked organic-inorganic hybrid membranes such as cross-linked cellulose acetate-cellulose triacetate-polyurethanepropylsilsesquioxane membranes. These cross-linked membranes with covalently interpolymer-chain-connected hybrid networks were prepared via a sol-gel condensation polymerization of cross-linkable organic polymer-organosilicon alkoxide precursor membrane materials. CO₂ plasticization tests on these cross-linked membranes demonstrate extremely high CO₂ plasticization resistance under CO₂ pressure up to 5516 kPa (800 psig). These new cross-linked membranes can be used not only for gas separations such as CO₂/CH₄ and CO₂/N₂ separations, O₂/N₂ separation, olefin/paraffin separations (e.g. propylene/propane separation), iso/normal paraffins separations, but also for liquid separations such as desalination.

The invention discloses a click chemistry based metal-organic framework cross-linking membrane and a preparation method and application thereof.Polymerizable double bonds are introduced into MOFs (metal-organic frameworks) through a post-synthetic modification method, and the chemical cross-linking type MOF membrane is prepared in situ by thiol-ene click reaction, so that a novel rapid efficient solvent-free method mild in conditions is provided for MOFs membrane synthesis.By means of applying the strategy, an obtained independent homogeneous MOFs hybrid membrane material is excellent in membrane forming performance and toughness, and the defects of agglomeration of MOFs crystals and poor compatibility between the MOFs and polymers are overcome.The synthesized MOFs membrane material is excellent in selective separation effect on dye molecules in water and has a promising application prospect in the field of membrane separation.

The invention discloses an anti-pollution composite graphene oxide nanofiltration membrane. The anti-pollution composite graphene oxide nanofiltration membrane comprises a base membrane and a graphene oxide membrane used as a separation layer, the base membrane is covered with the graphene oxide membrane, and the graphene oxide membrane is covered with a cross-linking membrane for protecting the graphene oxide membrane, wherein the cross-linking membrane is obtained through cross-linking polyvinyl alcohol and a cross-linking agent, the cross-linking agent is dialdehyde or maleic anhydride, and the cross-linking membrane has a porous structure. The invention also discloses a method for producing the anti-pollution composite graphene oxide nanofiltration membrane. The production method comprises the production of a cross-linking layer. The method is simple to operate and is easy to implement.

This invention relates to cross-linked block polymer anion exchange membrane, a preparation method and applications thereof. According to the method, during the membrane preparing, a chloromethylatedblock polymer is simultaneously cross-linked and aminated by using a one-step method; after the membrane is formed, the membrane is further quaternized with tertiary amine; and alkalization is performed to obtain the cross-linked anion exchange membrane. According to the present invention, the polymer is chloromethylated by using the environmentally-friendly low-toxicity 1,4-dichloromethoxybutaneas a chloromethylating agent, the cross-linking and amination of the polymer is performed with the tertiary amine during the membrane forming, and after the membrane forming, the re-amination is performed with the tertiary amine so as to increase the number of the quaternary ammonium groups; with the method, the cross-linking and the quaternization are performed simultaneously during the membraneforming, such that the mechanical strength and the dimensional stability of the cross-linked membrane are improved, and the quaternization efficiency is effectively increased; and the obtained cross-linked anion exchange membrane has high conductivity, and has potential application prospects in alkaline anion exchange membrane fuel cells.

The invention discloses a polybenzimidazole/polyvinylbenzyl chloride cross-linked high temperature proton exchange membrane with high oxidation resistance, and a production method thereof. The cross-linked membrane adopts polybenzimidazole as a polymer skeleton, a cross-linked netted structure is formed in the membrane through a polymerization reaction by using the polyvinylbenzyl chloride as a cross-linking agent, and spraying of two sides of the membrane is carried out to produce anti-oxidation layers with strong free radical quenching ability in order to produce the high temperature proton exchange membrane with high oxidation resistance and high conductivity. The cross-linked high temperature proton exchange membrane has good proton conduction ability and excellent dimension stability without moistening, also has high oxidation resistance, can effectively solve the problem of polymer skeleton life shortening caused by attack of free radicals, and can be applied as a proton exchange membrane to high temperature proton exchange membrane fuel cells, direct alcohol fuel cells, electrochemical sensors or other electrochemical devices.

The invention relates to a method for preparing polybenzimidazole cross-link membranes from functionalized graphene oxide. The polybenzimidazole cross-link membranes comprise polybenzimidazole homopolymers, modified graphene oxide and phosphoric acid. The method has the advantages that binary acid and aromatic quaternary amine are used as monomer raw materials, polyphosphoric acid is used as a reaction medium, reaction is carried out at the temperature of 150-220 DEG C under the condition of nitrogen protection for 5-30 h to obtain the polybenzimidazole homopolymers, and the prepared polybenzimidazole homopolymers in solvents such as dimethyl sulfoxide, N, N-dimethylacetamide, phosphoric acid, sulfuric acid and methylsulfonic acid are excellent in dissolubility; graphene oxide (GO) powderis prepared by the aid of improved Hummers processes, and graphene oxide is modified by the aid of silane coupling agents (KH560) to obtain the functionalized graphene oxide (KH560-GO); the prepared functionalized graphene oxide (KH560-GO) is used as a cross-linking agent, and the polybenzimidazole cross-link membranes with excellent mechanical performance and methanol diffusion resistance can beprepared by the aid of cross-linking reaction between imidazole rings in the prepared polybenzimidazole homopolymers and epoxy functional groups in the functionalized graphene oxide (KH560-GO); cross-link membranes can be ultimately soaked in phosphoric acid solution (with the concentration of 50-85%) for 6-24 h to obtain the polybenzimidazole cross-link membranes with low phosphoric acid doping,and service requirements in the field of high-temperature fuel cells, sensors and the like can be met.

The invention discloses a cross-linked poly(triazole) ion liquid/polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. The cross-linked membrane adopts polybenzimidazole as a polymer skeleton, adopts triazole ion liquid-based polyethylene as a cross-linking agent, and the cross-linked high-temperature proton exchange membrane is formed by virtue of self cross linking. The cross-linked poly(triazole) ion liquid/polybenzimidazole high-temperature proton exchange membrane proposed by the invention has good proton electric conductivity and excellent size stability in a case of not increasing the humidity, and the weaknesses of the polybenzimidazole/phosphate high-temperature membrane such as unstable electric conductivity caused by the loss of phosphoric acid can be effectively avoided. The cross-linked poly(triazole) ion liquid/polybenzimidazole high-temperature proton exchange membrane has the advantages of high electric conductivity, low air permeability and the like. The cross-linked poly(triazole) ion liquid/polybenzimidazole high-temperature proton exchange membrane proposed by the invention can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohol fuel cell, an electrochemical sensor or other electrochemical apparatuses.

The invention discloses a cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and a preparation method thereof. The cross-linking membrane takes free radical quencher-containing porous polybenzimidazole as a substrate; pores are filled with polybenzimidazole and organosilicone cross-linking resin. The cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention has good proton conducting capacity and excellent oxidation resistance without humidifying, and the problem about swelling after the polybenzimidazole is immersed into phosphoric acid is effectively solved. The cross-linking type polybenzimidazole/silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohols fuel cell, an electrochemical sensor and other electrochemical devices to serve as a proton exchange membrane.

The invention relates to a preparation method for microcapsules with magnetic nanoparticles-containing capsule walls. The microcapsules are medicine-carried microcapsules which take cross-linked films of sulfydryl-containing amino acid or peptide-modified magnetic nanoparticles as capsule walls and take an oil phase loaded with hydrophobic medicines as a core material. According to the preparation method, the magnetic nanoparticles are directly loaded on the capsule walls of the microcapsules, so that the agglomeration of the magnetic nanoparticles is avoided; the magnetic nanoparticles are uniformly distributed on the capsule walls of the microcapsules, so that the contact between the magnetic nanoparticles and the medicines loaded in capsule cores is reduced to the maximum; therefore, the influence on the medicine effect and the targeting caused by the magnetic nanoparticles is reduced; the controllable targeting transmission of the medicines is realized by utilizing the magnetic targeting of the magnetic nanoparticles; the controllable targeting release of the medicines is realized by utilizing the reduction responsiveness of disulfide bonds; the preparation method is easy to operate, efficient and quick, and moreover, impurities are not easily introduced.

The invention discloses a bionic micro-nano laminated hydrophobic biological valve and a preparation method thereof. The hydrophobic biological valve is formed by constructing a bionic micro-nano laminated compound network structure on the pericardium surface after cross-linking fixation through a layer-by-layer superposition mode, so that the contact angle of the surface of the valve is 90-145 degrees. The number of bionic micro-nano laminated compound laminations on the surface of the valve is 1-5, wherein a hydrophobic network topology basic framework is constructed on the surface and innerportion of the valve in the first layer; a stable network topology structure required by hydrophobicity is formed in the second layer, the third layer, the fourth layer and the fifth layer. The hydrophobic biological valve has obvious anticoagulation and anti-adhesion properties, and can effectively reduce the formation of thrombi and calcified spots; since the multilayer structure of the hydrophobic biological valve is hydrophobic high-molecular polymer mixed cross-linking membrane layers from inside to outside, the formed hydrophobic structure has long-term stability under the blood environment in the body.

The invention discloses a composite lignin nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: (1) mixing lignin, polyether imide and an organic solvent, carrying out stirring at 25 to 60 DEG C, then carrying out standing and defoaming at 6 to 25 DEG C so as to prepare a membrane casting liquid, smearing a smooth surface of a non-woven fabric with the membrane casting liquid, standing the non-woven fabric, then placing the non-woven fabric into deionized water for soaking, taking the non-woven fabric out and drying moisture through absorption so as to obtain a base membrane, wherein the smooth surface of the non-woven fabric with the smeared membrane casting liquid is called as surface A; (2) immersing the surface A in a methanol solution of ethene diamine, carrying out soaking, taking the surface A out and washing the surface A with deionized water so as to obtain a cross-linked membrane; and (3) soaking the surface A of the cross-linked membrane in an aqueous solution of m-phenylenediamine, taking the surface A of the cross-linked membrane out, draining moisture through absorption, then soaking the surface A in a hexane solution of trimesoyl chloride, taking the surface A out and carrying out air drying so as to obtain the composite lignin nanofiltration membrane. The preparation method has the advantages of usage of cheap and easily available raw materials, simple process and rapid reaction; and the obtained composite lignin nanofiltration membrane has high flux and high separation selectivity.

The invention provides a method for improving the color fastness of acid fluorescent dyes. The method includes the following steps: (1) a fabric dyed with the acid fluorescent dyes is provided; (2) first-time color fixing processing is carried out on the dyed fabric with an acid dye-fixing agent; (3) second-time color fixing processing is carried out on the dyed fabric with the acid dye-fixing agent. The method has the advantages that all steps are executed under the acid conditions, and two times of color fixing are continuously carried out with the acid dye-fixing agent. The dyes and the fabric can be bridged through the acid dye-fixing agent to form a compound; in other words, the acid dye-fixing agent can be in cross-linking reaction with -NH2 on the fabric while being bonded with dye molecules, cross-linking membrane formation can be carried out on the acid dye-fixing agent to form the high diversification cross-linked polymeric membrane of a cubic net structure, and the surface of the fabric is covered with the polymeric membrane, so that the dyes and the fabric are combined together more tightly and firmly, the dyes are effectively prevented from dropping from the fabric, and the color fastness of the acid fluorescent dyes is improved.

The invention belongs to the technical field of waste water treatment, and provides a cation exchange membrane for electrodialytic treatment and a preparation method thereof. The preparation method comprises the following steps: adding biological vermiculite powder into sodium alginate colloid, coating, drying to form a film, using iron chloride solution as a cross-linking agent, enabling sodium alginate to form a cross-linked membrane, removing iron ions by in a washing manner, and preparing the cation exchange membrane for the electrodialytic treatment of the ammonium and nitrogen waste water. Compared with the traditional method, the cation exchange membrane prepared by the invention is high in ammonium and nitrogen removal rate and longer in time for reaching the adsorption saturation,can be synergistic with microorganisms in the ammonium and nitrogen waste water comprising the microorganisms to realize the regenerative circulation, and the cation exchange membrane is high in ammonium and nitrogen desorption rate when in recycling, and recyclable. After being used for a long time and circularly, the membrane can still maintain a higher removal efficiency and mechanical performance and is long in service life.

The invention relates to a microcapsule containing functionalized graphene in a capsule wall and a preparation method of the microcapsule. In the microcapsule, a crosslinked membrane of sulfhydrylized graphene obtained by modifying a compound which simultaneously contains sulfhydryl and amino or bio-molecules is used as the capsule wall, and an oil phase which is loaded with hydrophobic drugs is used as a core material. The preparation method is achieved by ultrasonically radiating a water solution containing the sulfhydrylized graphene and the oil phase which is loaded with the hydrophobic drugs so as to obtain the microcapsule which contains the functionalized graphene in the capsule wall. The microcapsule disclosed by the invention is capable of achieving the controlled release of the drugs on the basis of the reducing responsiveness of a disulfide bond; and the preparation method is simple to operate, efficient and rapid and high in drug loading capacity, and the preparation method is not easy to introduce impurities, widely applicable to the cladding of the hydrophobic drugs and excellent in application prospect.

The invention discloses a solvent-resistant composite nanofiltration membrane and a preparing method. The preparing method comprises the steps that firstly, polyetherimide and an organic solvent are mixed and stirred at 35-80 DEG C, then standing is carried out at 6-25 DEG C for defoaming, a membrane casting solution is obtained and spread on non-woven fabric, the non-woven fabric is put in air, soaked with deionized water and taken out, moisture on the surface is absorbed with filter paper, and a base membrane is obtained, wherein the face, with the membrane casting solution spread, of the non-woven fabric is called a face A; secondly, the face A of the base membrane is soaked in an ethylenediamine methanol solution, taken out and washed with deionized water, and a cross-linked membrane is obtained; thirdly, the face A of the cross-linked membrane is soaked in an ammonium lignosulfonate aqueous solution and taken out, then the face A is soaked in a trimesoyl chloride n-hexane solution, taken out and air-dried, and the solvent-resistant composite nanofiltration membrane is obtained. The solvent-resistant composite nanofiltration membrane and the preparing method are low in cost, the method is simple, and a reaction is quick; the obtained solvent-resistant composite nanofiltration membrane has high separation selectivity and solvent tolerance.

The invention relates to the field of a lithium-ion battery and specifically discloses a lithium-ion battery diaphragm with a promoted heat resistance, a preparation method thereof and a lithium-ion battery. The method comprises the following steps: (1) melting and blending polyethylene, cross-linking agent and cross-linking auxiliaries, thereby acquiring a mixture A; (2) molding the mixture A into an initial diaphragm B, wherein the gel content of the initial diaphragm B is less than 5wt%; (3) performing high-temperature cross-linking on the initial diaphragm B, thereby forming a cross-linking diaphragm C, wherein the gel content of the cross-linking diaphragm C is 30-70wt%; (4) stretching the cross-linking diaphragm C, thereby acquiring a stretched diaphragm D; (5) annealing the stretched diaphragm D, thereby acquiring the lithium-ion battery diaphragm, wherein the melt index of polyvinyl is 0.02g/10min-5g/10min, and in 100 weight parts of polyvinyl, the dosage of the cross-linking agent is 0.03-8 parts by weight and the dosage of the cross-linking auxiliaries is 0.03-10 parts by weight. The method can be adopted for preparing the lithium-ion battery diaphragm with promoted heat resistance.

The invention discloses a sulfonated poly aryl ether ketone cross-linking membrane containing thioether keys and a preparing method thereof. A bisphenol monomer, diallyl bisphenol A, 4,4'-difluoro diphenyl methanone and 3,3'-sodium sulfonate-4,4'-difluoro diphenyl methanone are utilized for being subjected to condensation polymerization to generate sulfonated poly aryl ether ketone containing allyl; then a cross-linking agent is added, and the sulfonated poly aryl ether ketone cross-linking membrane containing the thioether keys are generated under catalysis of benzoyl peroxide. The prepared sulfonated poly aryl ether ketone cross-linking membrane containing the thioether keys has better size stability, low methyl alcohol permeability, good proton conduction performance and high antioxidant stability, and the cross-linking membrane has a potential application prospect in the field of fuel cell polymer electrolyte membranes.