215results about How to "Increased swelling resistance" patented technology

A composite ion exchange membrane having a high swelling resistance and being superior in mechanical strength and ion conductivity can be provided by means of an composite ion exchange membrane including an ion exchange resin composition and a support membrane having a continuous pore penetrating the support membrane, wherein the support membrane is one which accepts the ion exchange resin composition within the pore, and wherein the ion exchange resin composition is one which contains an ion exchange resin containing, as a main component, an aromatic polyether and / or its derivative, the aromatic polyether being obtained by mixing a compound having a specific structure, an aromatic dihalogenated compound and a bisphenol compound with a carbonate and / or a bicarbonate of an alkali metal and polymerizing the mixture in an organic solvent.

The invention discloses cellulose microsphere, and a preparation process and the application. The cellulose microsphere is prepared through dispersing cellulose solution in organic solvent which comprises emulsifier or composite emulsifier, solidifying in constant temperature for 1-10hr to shape after stirring to evenly disperse drops, then adding diluted acid to make cellulose regenerate into microsphere, standing and stratifying, filtering to obtain cellulose particles, finally obtaining cellulose microsphere after decantation. The solution of cellulose and the preparation of cellulose microsphere are physical processes without chemical reaction. The whole preparation technology is simple, has short time consumption, and organic solvent can be repeatedly used. The process has low device demand, which is convenient for industrial production. The cellulose microsphere which is prepared through adopting the process has favorable mechanical property, excellent flow-ability, heat stability and swelling resistance property, oxidation resistance ability, biodegrability resistance and acidic and alkali degradation capability, and has extensive usage.

The invention discloses a cellulose micro-sphere with a uniform size as well as a preparation method and an application thereof. According to the cellulose micro-sphere, the diameter distribution coefficient is less than 10% and the grain diameter ranges from 500 nanometers to 150 microns; the cellulose micro-sphere is prepared by the following manner: cellulose is dissolved into an alkali / urea water solution or an alkali / thiourea water solution at temperature from -12 DEG C to -5 DEG C; centrifuging and de-foaming, and removing impurities to obtain a cellulose solution which is used as a water phase; dissolving an oil-soluble emulsifying agent into oily liquid according to a volume ratio of 0-10% to obtain an oil phase; pressing the water phase into the oil phase by a hydrophobic porous membrane to obtain W / O emulsion; under an agitating condition, adding a curing solution into the W / O emulsion, and separating and washing to obtain the cellulose micro-sphere. The preparation method is convenient to operate, low in cost and good in repeatability and is suitable for large-scale preparation of the cellulose micro-spheres; the prepared cellulose micro-spheres are uniformly dispersed, have uniform size and are not easy to agglomerate; the cellulose micro-spheres can be used as medicines, macromolecular carriers, adsorbents and chromatographic column fillers.

The invention discloses a fluorine-containing polysiloxane rubber state composite gas separation membrane, a preparation method and an application thereof. A porous polymer material is used as a support membrane, and a fluorine-containing polysiloxane material is coated on the surface of the support membrane. The preparation method of the fluorine-containing polysiloxane rubber state composite gas separation membrane comprises the following steps of: dissolving fluorine-containing polysiloxane into a solvent to prepare coating liquid; adding a cross-linking agent and a catalyst into the obtained solution; uniformly stirring, standing and de-foaming; coating the coating liquid on the porous support membrane; and heating, curing and cross-linking until the porous support membrane is dried to obtain the fluorine-containing polysiloxane rubber state composite gas separation membrane. The composite gas separation membrane provided by the invention can be applied to separations of oxygen gas from nitrogen gas, carbon dioxide from nitrogen gas, and organic vapors, and has the characteristics of swelling resistance, resistance to pressure, weather fastness, and the like.

The invention relates to a crucible for melting crystalline silicon, a method for producing the crucible and a spray coating liquid, belongs to the technical field of crucibles, is used for solving the problem that the coating of the existing crucible is easy to peel off and damage during the use process, so impurities cannot be well prevented from permeating, and aims to provide the spray coating liquid for a coating of a crucible for melting crystalline silicon. The spray coating liquid comprises silicon nitride, a sintering additive, and organic binder, inorganic binder and a sintering binder which can be bonded with a crucible body at normal temperature. The invention further provides the crucible which adopts the spray coating liquid. The crucible comprises a crucible body, the internal surface of the crucible body is coated with a coating, and the coating is formed by spraying the spray coating liquid. The invention also provides the method for producing the crucible, which produces the crucible for melting crystalline silicon through spray coating, drying, burning off and sintering. The crucible can be repeatedly used, the coating is not easy to peel off and damage, so the impurities, particularly oxygen element in the crucible body can be effectively prevented from permeating.

The invention discloses a biomass internal wall paint and a preparation method thereof, and aims to solve the problems of high harmful substance content and especially high formaldehyde content in the existing internal wall paint. The preparation method comprises the following steps: taking softened water, dodecenyl starch aluminum succinate, dispersing agent, wetting agent, titanium white, calcined kaolin, highly-crosslinked porous starch, ground calcium carbonate and light calcium carbonate, adding into a dispersion machine, dispersing at the high speed of 1500 r / min for 20-40 minutes, lowering the speed to 500 r / min, sequentially adding the composite modified starch emulsion, propanediol and defoaming agent, and uniformly dispersing to obtain the composite modified starch-base biomass paint. The obtained biomass internal wall paint has the advantages of delicate paint film, scrub resistance, low VOC (volatile organic compound) content and no formaldehyde, has favorable humidity regulation function, and is green and environment-friendly.

The invention belongs to the technical field of biomedical materials and discloses double-crosslinked sodium alginate hydrogel and a preparation method and application thereof. The preparation method includes: dissolving sodium alginate into deionized water, adding activating agents to activate, adding furfurylamine to react for 12-36 hours, and subjecting a reaction product to dialysis and freeze drying so as to obtain furan-modified sodium alginate; dissolving the furan-modified sodium alginate into the deionized water, adding maleimide-terminated polyvinyl alcohol, stirring sufficiently to dissolve, performing ultrasonic treatment, injecting into a mould, and crosslinking at 37-60 DEG C so as to obtain gel; soaking the gel into a calcium chloride solution for 12-48 hours for physical crosslinking so as to obtain the double-crosslinked sodium alginate hydrogel. By the aid of a double-crosslinking method consisting of click chemistry crosslinking and ionic crosslinking, the obtained double-crosslinked sodium alginate hydrogel has excellent mechanical and anti-swelling properties and can be applied to scaffolds for tissue engineering.

The invention discloses a method for preparing molecule print chitose / silicic acid carbethoxy hybridized film used to separate phenylalanine isomer of water solution. Said method comprises: adding chitose into acetate water solution whose content is 2%; mixing and filtering insoluble part with filter cloth to attain chitose solution; mixing and adding silicic acid carbethoxy into chitose solution; fully mixing, than adding L-phenylalanine water solution to be mixed for 12 hours; defoaming and filling casting liquid on the horizontally arranged clear organic glass plate horizontally to be extended and form transparent film; thermal treating the film and washing. The invention has the advantages that: the method is simple; attained molecule print chitose / silicic acid carbethoxy film has high density without significant phase separation, and it has better mechanical strength, and better separation function on phenylalanine isomer.

The invention discloses a method for functionalizing a graphene oxide nanosheet and application of a hybrid composite membrane constructed on the basis of the method. When dopamine is subjected to oxidation self-polymerization, oxygen-containing groups on the surface of graphene oxide are subjected to reduction, and the swelling resistance of the hybrid membrane is improved. The thickness of the membrane is about 6 micrometers, the membrane is composed of a polyether-polyamide block copolymer matrix and functionalized graphene filler, and the mass fraction of the graphene component in the filler ranges from 2% to 8%. The preparation process comprises the steps that polydopamine is subjected to oxidation self-polymerization on the surface of the graphene oxide nanosheet, graphene oxide is subjected to reduction, a functionalized graphene nanosheet is obtained, the polyether-polyamide block copolymer matrix is filled with the functionalized graphene nanosheet, the surface of a polysulfone ultrafiltration membrane supporting layer is subjected to spin coating with the functionalized graphene nanosheet, and the composite membrane is obtained. The preparation process of the composite membrane is simple, convenient and controllable, the obtained membrane is applied to the pervaporation oil product desulfurizing process, and high separating property and swelling resistance are both achieved.

The present invention discloses a production method of sugar-containing polymer hole-blocking compound membrane and the application in permeation vaporization and dehydration of organic solvent. The said method comprises the following steps: mixing sugar-contained monomer, comonomer, cross linker, evocating agent and solvent to formulate polymerized solution; performing in-situ polymerization by adopting photo-initiation or thermal initiation mode after the polypropylene microporous membrane is immersed in polymerization solution for a special time; getting sugar-contained polymer hole-blocking compound membrane after cleaning and drying. The sugar-containing polymer hole-blocking compound membrane prepared by the invention can be used for organic solvent dehydration, has advantages of high separation factor, large separation flux, good mechanical properties, good chemical stability and thermostability, and has utility value in separation and purification of organic solvent.

The invention provides a method for making a cation exchange membrane through photocuring. The method comprises the following steps: coating a substrate with a slurry containing a polymerizable monomer and a photoinitiator, wherein the polymerizable monomer contains sulfonate ions or a compound containing a functional group which can introduce the sulfonate ions; initiating the polymerization and crosslinking of alkenyl function groups on the monomer in the initiating slurry; and washing, and post-processing to obtain the sulfonic acid type cation exchange membrane with a physical conformation. Compared with present making methods of the cation exchange membrane through a hot pressing polymerization process, the method has the advantages of fast polymerization speed, low polymerization temperature, fast curing time and small pollution, and the obtained cation exchange membrane has the advantages of uniformity, stability, good mechanical properties and good chemical resistance, so the cation exchange membrane has a good application prospect in the fields of electrodialysis water treatment, pervaporation, gas separation, new energy batteries, the atomic energy industry and analysis, catalytic synthesis and the chlorine alkali industry.

The invention relates to a high-corrosion-resistance fluororesin powder coating composition and a preparation method thereof. The high-corrosion-resistance fluororesin powder coating composition can be used for preventing corrosion of a base material and preventing corrosive acid and other chemicals from permeating the base material so as to protect the base material. The existence of inherent pores and defects in a coating formed by fluororesin can accelerate the failure of the coating, so that the application and development of a coating protection technology are limited. Therefore, in order to further enhance the protection performance of the fluororesin coating, the effect of constructing a fluororesin powder coating synergistic protection system is achieved by selecting the multifunctional flaky filler, the flow promoter is optimally fumed silica, and when the fumed silica is used as the high-temperature-resistant powder coating, the composition can be used for electrostatic spraying and also can be used for a roller coating forming process with high requirements on powder fluidity.