214results about How to "Increased swelling resistance" patented technology

The invention discloses an oxidized graphene-modified super-hydrophilic super-oleophobic oil-water separation film and a preparation method and application thereof. The method comprises the following steps: mixing a hydrophilic polymer water-sensitive agent and a cross-linking film-forming agent according to a ratio of 1:9-9:1, dissolving the mixture and nano-silica sol in water according to a mass ratio of 1:9-9:1, magnetically stirring uniformly to prepare a 1-99% solution, adding 0.5-1 percent of oxidized graphen as an inorganic cross-linking agent, and ultrasonically and uniformly dispersing; ultrasonically cleaning a fabric silk screen with the particle size of 100-300 meshes, drying at normal temperature, forming a film on the silk screen in a spraying, dip-coating or spinning manner, drying and cross-linking, thus obtaining the hydrophilic and underwater super-oleophobic oil-water separation film. The oil-water separation film has excellent swelling resistance and mechanical property after graphene cross-linking modification, has a contact angle of 0 degree with both water and oil in air and has high super-hydrophilic property; the film has a contact angle of 150 degrees with oil drops under the water and has the low-adhesion characteristic to oil drops. The film can be applied to separation of oil-water mixtures and treatment of oil-containing sewage.

The invention provides a preparation method for a metal organic framework modified graphene oxide lamellar structure composite membrane used for organic solvent nanofiltration, and belongs to the field of membrane separation. The preparation method includes the steps that firstly, a metal organic framework and graphene oxide are composited to prepare composite nanometer particles; and the composite nanometer particles and a polymer are assembled on a base membrane to prepare the metal organic framework modified graphene oxide lamellar structure composite membrane used for the organic solvent nanofiltration. The composite membrane has a good separation effect for dyes in organic solvent and still has high flux under the low operation pressure, and therefore the composite membrane has application potential on the aspect of organic solvent nanofiltration.

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.

Provided are compositions for improving the water-resistance and dimensional stability of wood and wood products. The compositions comprises wax and oil components, and can be applied as liquid compositions comprising little or no water. Also provided are methods for the application of the compositions to wood.

This invention provides a method for preparing cellulolytic enzyme lignin polyurethane and its raw materials. The raw materials comprise: cellulolytic enzyme lignin or its derivative, polyisocyanate, polyol oligomer, chain extension and crosslinking agent, organic solvent and additive. The method comprises: (1) dissolving cellulolytic enzyme lignin or its derivative in the organic solvent, mixing with polyol or a mixture of polyol and organic solvent, and heating or stirring to mix uniformly; (2) adding polyisocyanate, heating, adding conventional additives or fillers, heating to react completely, and vacuum-distilling to obtain brown solid; (3) washing the solid with water, and drying to obtain cellulolytic enzyme lignin polyurethane. The cellulolytic enzyme lignin is a natural polymeric material extracted from wood, bamboo and straw, thus can effectively utilize biomass resources and replace petrochemical raw materials. The method largely improves the process for preparing cellulolytic enzyme lignin polyurethane, which has a better modification effect than traditional sulfonated lignin, and lower cost than high-boiling-point alcohol lignin.

The invention provides an aromatic polymer sulfonamide. The above polymer adopts an aromatic polymer as a main chain, and the side chain of the polymer contains a sulfonamide group. The sulfonamide group is hydrophobic, can dissociate at a high temperature to provide protons, and cross-links with an acyl chloride group, a sulfonyl chloride group and a phosphoryl chloride group, so the aromatic polymer sulfonamide has the advantages of good barrier, good conductivity and good mechanical strength as a film material, and has good application prospects in fields of fuel batteries, flow batteries, electrodialysis and solid acid catalysts.

The invention relates to a preparation method of a pervaporation film with the preferential penetration of dimethyl carbonate. Film casting liquid containing vinyl polydimethylsiloxane (Vi-PDMS), hydrogen-containing polydimethylsiloxane (H-PDMS), hydrophobic nano SiO2, a catalyst and a solvent is adopted, a film is coated on an upper layer of a porous ultrafiltration film supported by a polyester non-woven fabric, is aired at room temperature and is also heated, and the cross linkage of the film is finished. An additive type polydimethylsiloxane compound film filled with the hydrophobic nano SiO2, which is obtained by the preparation method of the pervaporation film with the preferential penetration of the dimethyl carbonate, has a simple film preparation process, adopts the materials with low price, strong swelling resistance in dimethyl carbonate/methanol azeotropic liquid, and excellent performance of preferential penetration of the dimethyl carbonate. When the filling mass proportion of the hydrophobic nano SiO2 is 15 percent, the separation factor alpha of the pervaporation film is equal to 3.97, and the penetration flux J is equal to 0.707kg/m2h ([DMC]=30wt%, 40 DEG C).

The invention provides an aluminum alloy plate used for a battery housing used for deep-draw processing, and the battery housing using the aluminum alloy plate. The occurrence of hot adhesion in a forming processing process can be prevented. And the aluminum and the battery housing has excellent pulse weldability. The aluminum plate used for the battery shell contains, by mass, 0.1 percent to 2.0 percents of Fe, 0.05 percent to 0.5 percent of Si, 0.05 percent to 0.5 percent of Mn, less than 0.04 percent of Ti, less than 10 percents of B and rest of Al and inevitable impurities. In the central part in a thickness direction of the section of the aluminum alloy plate used for the battery housing, the area rate of intermetallic compound having a maximum length more than 1 micrometer is 0.3 to 3.5 percents, and the number of the intermetallic compound having maximum length more than 11 micrometers is less than 140/mm2. The electric conductivity of the aluminum alloy plate used for the battery housing is lower than 62 IACS percent.

The invention discloses a nucleic acid aptamer functionalized POSS (polyhedral oligomeric silsesquioxane) crosslinking organic-silica gel hybridization monolithic column, and a preparation method thereof. The monolithic column is a compatible monolithic column formed in a way that highly-hydrophilic organic polymerized monomer, POSS, acrylic ester cross-linking agent, nucleic acid aptamer aqueoussolution and initiator are dissolved through ternary pore-forming agent to form homogeneous solution; the homogeneous solution is injected into the column to synchronously generate free radical thermal-initiation polymerization and 'sulfydryl-alkene' click chemistry reaction to be directly prepared; the ternary pore-forming agent is mixed solution formed by three ingredients of aqueous-N,N-dimethyl formamide-PEG (polyethylene glycol) 10000. The nucleic acid aptamer is bonded by covalent bonds through a one-step method, and the prepared compatible monolithic column has the advantages of stablestructure and simple and quick method and is suitable for the specific recognition separation of ochratoxin A.

The invention provides a cross-linked polyacrylonitrile-based amidoxime fiber. A method for preparing the cross-linked polyacrylonitrile-based amidoxime fiber includes steps of (1), carrying out cross-linking on polyacrylonitrile fibers by the aid of triethylenetetramine to obtain cross-linked polyacrylonitrile fibers; (2), carrying out amidoximation on the cross-linked polyacrylonitrile fibers obtained at the previous step by the aid of hydroxylammonium chloride to obtain the cross-linked polyacrylonitrile-based amidoxime fiber. The cross-linked polyacrylonitrile-based amidoxime fiber and the method have the advantages that the problem that common amidoxime fibers cannot be directly applied to Bayer solution for extracting gallium can be effectively solved; the cross-linked polyacrylonitrile-based amidoxime fiber is high in mechanical strength and high in gallium adsorption capacity and selectivity and has a broad market prospect.

The invention discloses an EPDM/EPM engine synthetic brake fluid and expansion resistance rubber material. The material is characterized in that the following components are proportionally mixed in parts by mass: 70-90 parts of EPDM (ethylene propylene diene monomer); 2-4 parts of zinc oxide; 1-3 parts of stearic acid SA; 2.5-4 parts of antiager BLE (liquid); 2-3.5 parts antiager SP (liquid) of 0.5-2 parts of antiager RD; 55-65 parts of N550 carbon black; 18-21 parts of EPM (binary ethylene propylene copolymer); 19-22 parts of StronWiNTC; 19-21 parts of liquid EPDM; 0.5-1.5 parts of assistant crosslinker IS; 1-2 parts of accelerant DM; 0.5-1.5 parts of crosslinker 96% peroxide vulcanizing agent DCP; 1.5-2.5 parts of polyethylene glycol; the invention further discloses a manufacturing process of the rubber material; the rubber material disclosed by the invention is high in quality and low in cost, does not expand in brake liquid, softener is not extracted, and volume expansion, solution, contraction and other phenomena of master and assistant cups are not caused.

The invention relates to the field of polymeric separation membrane, in particular to nanocellulose-compound nanofiltration membrane (CNF-NF). The nanocellulose-compound nanofiltration membrane (CNF-NF) comprises base membrane, a main supporting layer and a separation skin layer which are sequentially arranged, wherein pore diameters of the base membrane, the main supporting layer and the separation skin layer decrease progressively; a water-based binder located between the base membrane and the main supporting layer is arranged on the main supporting layer; and the base membrane, the main supporting layer and the separation skin layer are polyacrylonitrile membrane, a cellulose nanocrystalline layer and a polyamide layer respectively. The nanocellulose-compound nanofiltration membrane (CNF-NF) is of a multi-layer compound structure, wherein cellulose nanocrystalline is a one-dimensional nanometer material, and has good hydrophilicity, mechanical strength and resistance to swelling; byintroducing the cellulose nanocrystalline middle layer, physical support can be provided for the skin layer; and a production process of the nanofiltration membrane is simple to operate and mild in reaction condition, and the nanofiltration membrane has a good industrial production basis and wide application prospects.

The invention relates to a preparation method of ethylene carbonate, and mainly solves the problems of low activity and easy inactivation of catalysts in the prior. According to a technical scheme, ethylene oxide and carbon dioxide are adopted as the raw materials, under the conditions of a reaction temperature of 60-200DEG C, a reaction pressure of 0.1-10.0MPa, and a catalyst/ethylene oxide weight ratio of 0.001-1, the reaction raw materials and the catalyst contact to generate ethylene carbonate; and the catalyst is halogen composite imidazolyl resin. The method well solves the problems, and can be used for the industrial production of ethylene carbonate from ethylene oxide and carbon dioxide.

The invention provides a preparation method of a graphene oxide/attapulgite/polyvinyl alcohol ceramic matrix composite membrane (GO/ATP/PVA composite membrane). A Al2O3 ceramic matrix is pretreated through 3-aminopropyl triethoxysilane (APTES), so that the binding force between the matrix and the composite membrane is increased, PVA is added to increase the swelling resistance of the composite membrane, and the GO/ATP/PVA composite membrane is prepared on the surface of the ceramic matrix through a vacuum filtration-low temperature drying method. The GO/ATP/PVA composite membrane has the advantages that the performance in the application of separating industrial wastewater is excellent, the preparation process is simple, the cost is low, and the preparation method is suitable for large-scale production.

The invention relates to a solvent-resistant polymer nanofiltration membrane as well as a preparation method and an application thereof. The preparation method comprises the following steps: carryingout cyclization imide on a diamine monomer and a dianhydride monomer in a first polar organic solvent at 160-230 DEG C under the action of a catalyst, and forming polyimide after complete reaction; wherein the diamine monomer comprises a carboxyl-containing diamine monomer and a carboxyl-free diamine monomer; dissolving polyimide in a second polar organic solvent to form a film forming solution with the concentration of 10wt%-40wt%; then carrying out phase inversion after the film forming solution forms a film to obtain an intermediate film; treating the intermediate membrane by adopting an organic solution of metal salt so that metal ions are coordinated and cross-linked with carboxyl in polyimide, and obtaining the solvent-resistant polymer nanofiltration membrane after cross-linking isfinished; wherein the metal salt is selected from metal salt and/or multivalent metal salt. The invention also discloses an application of the solvent-resistant polymer nanofiltration membrane in separation and/or purification of compounds in an organic solution.

Provided is a method for improving the dimensional stability of wood and wood products. The method comprises impregnation of wood with fluorocompounds. In one embodiment, the method comprises the impregnation of wood or wood products with a composition comprising fluoro-polymer emulsions and/or dispersions.

The invention discloses a method for preparing an anion-exchange membrane with a multi-crosslinked structure. The method comprises the following steps: (1) dissolving bromoethylated polyphenyl ether in N-methyl pyrrolidone to form a membrane casting solution, coating the membrane casting solution on a flat panel with a knife or coating the membrane casting solution on a supporting cloth, soaking in a coagulating bath, and drying to obtain a porous base membrane; (2) mixing 1-vinyl imidazole, bromopropane and isopropanol to enable the system to react; adding divinyl benzene, radical initiator and organic solvent after the reaction, and uniformly stirring to obtain a monomer solution; (3) soaking the porous base membrane with the monomer solution, putting the porous base membrane between twoPET films to form a complex; and heating the complex at the temperature of 60-100 DEG C, and releasing the two PET films to obtain an anion-exchange membrane semi-finished product; and (4) performingheat post-treatment on the anion-exchange membrane semi-finished product at the temperature of 130-150 DEG C to obtain the anion-exchange membrane. The anion-exchange membrane prepared by the methodhas low resistance, high transport number, good swelling resistance and good solvent resistance.

The invention provides a block type anion exchange membrane containing dense ion strings, and a preparation method thereof, wherein the block type anion exchange membrane can be used for an alkaline fuel cell, and is structurally characterized in that a plurality of ion strings are densely grafted on a hydrophilic segment of a block copolymer to serve as functional groups. The preparation method mainly comprises the following steps: (1) preparing a hydrophilic segment containing tetraphenylmethyl and a hydrophobic segment containing a suspended nitrile group; (2) preparing a block copolymer, and carrying out bromination modification; and (3) preparing the block type anion exchange membrane containing the dense ion strings. According to the invention, the anion exchange membrane prepared bythe method has a developed ion transmission channel, has the characteristics of high water content and low swelling rate, and overcomes the defect that the existing anion exchange membrane cannot have high water content, high conductivity and low swelling rate at the same time; and a highly toxic carcinogenic chloromethyl ether reagent is not used in the preparation process, so that the membranehas a wide application prospect in the field of alkaline fuel cells.