128results about How to "Improve gas permeability" patented technology

The invention belongs to the technical field of membranes and in particular relates to a porous material-polymer gas separation composite membrane. The composite membrane comprises a separation layer and a supporting layer, wherein a porous material-polymer hybrid membrane is adopted as the separation layer; one of a porous flat plate and a tubular or hollow fiber membrane is adopted as the supporting layer; the porous material of the separation layer is metal-organic frame materials (MOFs) with large specific surface area and high gas adsorption. The MOFs are added into the separation layer so that the gas permeation and selectivity of the membrane are obviously improved; the separation layer and the supporting layer are compounded so that the membrane keeps good mechanical property, and the separation layer is allowed to exist in a compact or asymmetric structure. The composite membrane provided by the invention has high gas separation property, good mechanical property and wide industrial application prospect.

Disclosed herein are a polyimide dope solution composition, a method for preparing a hollow fiber using the composition and a hollow fiber prepared by the method. More specifically, disclosed are a method for preparing a hollow fiber, comprising preparing a polyimide dope solution composition comprising polyhydroxyimide, polythiolimide or polyaminoimide, spinning the composition to prepare a hollow fiber, and thermally rearranging the hollow fiber, and the hollow fiber prepared by the method.

In accordance with the method, a hollow fiber made of a high free volume polymer membrane can be prepared by spinning the dope solution composition to prepare a hollow fiber and thermally rearranging the hollow fiber via thermal treatment. The hollow fiber thus prepared exhibits excellent gas permeability and selectivity, thus being suitable for use as a gas separation membrane.

The invention discloses a preparation method of a carbon fiber/toughened epoxy resin prepreg for a non-autoclave vacuum bag forming process. According to the method, the dissolution degree and the particle size of a curing agent and a toughening agent in epoxy resin are controlled by controlling a resin formula, the particle sizes of the curing agent and the toughening agent and process conditionsfor resin system configuration, and meanwhile, two modification effects are achieved: 1, the resin system is toughened; and 2, the requirements of a non-autoclave process on the viscosity of the resin in the prepreg and a room-temperature storage period are met. The prepared epoxy resin system is prepared into a rubber film, the carbon fiber/epoxy resin prepreg is further prepared by adopting a rubber film calendering method, and the semi-impregnated prepreg (unsaturated impregnated prepreg) is obtained by controlling the pressure and temperature during compounding of the rubber film and carbon fibers.

The invention relates to an adsorption filter material with a multilayer construction, particularly with a permeable adsorptive barrier layer composite, preferably for ABC protective clothing, wherein the adsorption filter material has at least a first barrier layer having a plurality of openings and at least a second barrier layer having a plurality of openings, as well as an adsorption layer disposed between the first and second barrier layers, wherein the first and second barrier layers are disposed in such a manner, that the openings and the openings do not overlap and/or do not coincide. The adsorption filter material is very comfortable and, at the same time, offers excellent protection against chemical poisons.

The present invention generally relates to a crosslinked silane-modified molecularly self-assembling material, cured manufactured article comprising the crosslinked silane-modified molecularly self-assembling material, semipermeable membrane comprising the crosslinked silane-modified molecularly self-assembling material, method of using the semipermeable membrane to separate an acid gas from a separable gas mixture comprising the acid gas and a permeation-resistant gas, and method of preparing the cured manufactured article from a curable manufactured article comprising a shaped reactive silane-modified molecularly self-assembling material.

Provided is a hollow fiber with a structure including a cavity positioned at the center of the hollow fiber, macro-pores present in the periphery of the cavity, and meso-pores and pico-pores present in the periphery of the macro-pores, wherein the pico-pores are connected to each other in a three-dimensional manner to form a three-dimensional network. The hollow fiber contains a polymer derived from a polyamic acid, wherein the polyamic acid includes repeating units prepared from aromatic diamines and dianhydrides containing at least one functional group present in an ortho-position relative to an amine group.

The present invention relates to a method for making an open celled microcellular foam comprising providing at least one foamable polymer and a crosslinking agent in an extruder, injecting at least one blowing agent into said at least one foamable polymer and said crosslinking agent in said extruder, blending said blowing agent injected into said at least one foamable polymer and said crosslinking agent in said extruder, feeding said blended blowing agent, at least one foamable polymer and said crosslinking agent in said extruder to a die, and depressurizing said blended blowing agent, said at least one foamable polymer and said crosslinking agent.

A cycloolefin addition polymer is prepared by addition polymerization of a cycloolefin-functionalized siloxane and optionally norbornene in the presence of catalyst A which is a nickel or palladium complex having a cyclopentadienyl ligand and a methyl, triphenylphosphine or allyl ligand and co-catalyst B, typically tris(pentafluorophenyl)boron or trityltetra(pentafluorophenyl)borate. The polymer is easy to manufacture and has high thermal stability and mechanical strength as well as good gas permeability.

The invention discloses a mixed matrix membrane as well as a preparation method and application of the mixed matrix membrane. The mixed matrix membrane comprises a base material and packing, wherein the base material is polyetherimide and the packing is a molecular sieve; the polyetherimide is selected from one or more of polyetherimide represented by a formula I shown in the specification, wherein A is described in the specification; Z is described in the specification; R is H, CH3 or OCH3; and B is -O-, -CH2-, -CO-, -SO2- or a formula shown in the specification. The mixed matrix membrane takes polyetherimide as the base material so that a polar ether oxygen group in polyetherimide can be sufficiently utilized so as to improve the selectivity of CO2; meanwhile, the molecular sieve with an interconnection pore structure is used as the packing so that the infiltration capacity and the selectivity of gas can be improved and the gas separation performance is excellent. Therefore, the mixed matrix membrane has high selectivity and good gas permeability.

Disclosed is a spiral wound carbon membrane and preparation method thereof. The spiral wound carbon membrane is composed of one or more integral and windable membrane layers composed of a porous support and carbon materials containing fillers filled in the surface, pores and gaps thereof. The spiral wound carbon membrane has a developed ultramicropore porous structure with superior mechanical strength and toughness, and can be directly used to separate a gas mixture with different molecular sizes or liquid mixture.

Disclosed is a hollow fiber that includes a hollow positioned at the center of the hollow fiber, macropores positioned at adjacent to the hollow, and mesopores and picopores positioned at adjacent to macropores, and the picopores are three dimensionally connected to each other to form a three dimensional network structure. The hollow fiber includes a polymer derived from polyamic acid, and the polyamic acid includes a repeating unit obtained from aromatic diamine including at least one ortho-positioned functional group with respect to an amine group and dianhydride.

The invention discloses a high-performance heat conduction material. The high-performance heat conduction material contains organic silicon resin, hexagonal boron nitride, aluminum oxide, graphene, platinum catalyst, hydrogen-containing silicone oil with hydrogen content of 0.5 to 0.8 percent, silane coupling agent, organosiloxane surface modifier, organic silicone oil and antioxidant 168; the organic silicon resin is low in surface tension, small in viscosity-temperature coefficient, high in compressibility and high in gas permeability, and the hexagonal boron nitride is high in precision and excellent in heat conduction performance and heat radiation performance, so that when the hexagonal boron nitride material is used for preparing an LED heat radiator, a high effect of heat resistance transfer and heat radiation for the LED can be realized; the hexagonal boron nitride and the aluminum oxide are used as heat conduction fillers, so that the cost performance is high; the graphene and the heat conduction fillers are combined with organic silicon resin in the formula, so that the reaction performance of the hexagonal boron nitride in the preparation process can be enhanced through the surface modifier, the compatibility and mechanical properties among the materials can be coordinately improved by virtue of the coupling agent, hydrogen-containing silicone oil and other additives, and a product with high quality and high performance can be obtained.

The invention discloses a modified atmosphere preservation method of spinach. The modified atmosphere preservation method comprises the following steps: (1) the spinach to be preserved is picked and selected; (2) the picked and selected spinach is precooled; (3) the precooled spinach is sterilized; (4) the sterilized spinach is put in a packaging container and the mixed gas of oxygen, carbon dioxide and nitrogen is introduced into the packaging container until the concentration of nitrogen, oxygen and carbon dioxide is 85-95%, 1-8% and 1-6% respectively; (5) after modified atmosphere packaging, the spinach is refrigerated in a cold storage. According to the preservation method disclosed by the invention can, in-vivo breath of the spinach can be restrained, body water of the spinach can be kept and the shelf life of the spinach is prolonged.

The present invention relates to a technology for manufacturing a nanocomposite membrane comprising a graphene oxide coating layer with a thickness of 1 nm to 50 nm, which is formed on various supports and has nanopores, and a reduced graphene oxide nanocomposite membrane, and applying the membranes to gas separation. The graphene oxide nanocomposite membrane for gas separation of the present invention has excellent gas permeability and selectivity at the same time, and especially, excellent hydrogen gas permeability and hydrogen gas selectivity compared with carbon dioxide, and the reduced graphene oxide nanocomposite membrane has remarkably enhanced hydrogen gas permeability and hydrogen gas selectivity compared with carbon dioxide, and thus the membranes are applicable as a gas separation membrane in an industrial field involving a hydrogen separation process. Furthermore, a graphene oxide nanocomposite membrane for gas separation can be provided, in which strong binding force between a support and a graphene oxide coating layer is induced by modifying surfaces of various supports and thus the graphene oxide coating layer is not easily delaminated.

Provided is a hollow fiber with a structure including a cavity at the center of the hollow fiber, macro-pores disposed in the periphery of the cavity, and meso-pores and pico-pores disposed in the periphery of the macro-pores, wherein the pico-pores are connected to each other in a three-dimensional manner to form a three-dimensional network. The hollow fiber contains a polymer derived from a polyimide, wherein the polyimide includes repeating units prepared from aromatic diamines and dianhydrides containing at least one functional group existing at an ortho-position relative to an amine group.

The invention discloses a modified atmosphere preservation method of fresh honey peaches. Precooled fresh honey peaches are put in a packaging container; mixed gas of oxygen, carbon dioxide and nitrogen is introduced into the packaging container until the concentration of nitrogen, oxygen and carbon dioxide is 85-95%, 1-8% and 1-6% respectively. According to the preservation method disclosed by the invention, the problems that honey peaches are extremely difficult to store and the time for preservation is short can be mainly solved, and the refreshing time the honey peaches lasts for as long as 25 days.

To provide a fibrous laminate having excellent secondary processability in processing into a filter or the like by laminating a fibrous layer composed of ultrafine fibers with another fibrous layer and strongly adhering and uniting each interlayer while reduction of characteristics of the ultrafine fibers is suppressed at a minimum to compensate insufficiency of mechanical strength and rigidity of a layer of ultrafine fibers.

The fibrous laminate includes fibrous layer I composed of ultrafine fibers having a mean fiber diameter of 10 to 1,000 nm and fibrous layer II composed of thermo-fusible conjugate fibers having a mean fiber diameter of 5 to 100 μm, in which contact points between the ultrafine fibers and the thermo-fusible conjugate fibers are bonded by melting of the thermo-fusible conjugate fibers composing the fibrous layer II, and the fibrous layer I and the fibrous layer II are laminated and united by the formed bonding points.

The invention discloses a method for preparing ion exchange SAPO-34 molecular sieve membrane, comprising the following steps of: (1) synthesizing SAPO-34 molecular sieve seeds; (2) loading the SAPO-34 molecular sieve seeds on a porous carrier; (3) synthesizing a SAPO-34 molecular sieve membrane; (4) loading a metal salt with a melting point lower than a roasting temperature in a step (5) on the SAPO-34 molecular sieve membrane; and (5) high temperature roasting to remove a template, and simultaneously carrying out ion exchange to obtain the ion exchange SAPO-34 molecular sieve membrane. By loading metal salts with a low melting point on the surface of the molecular sieve membrane, the method combines two steps: template removal and ion exchange, into one step, thereby simplifying a preparation process of the SAPO-34 molecular sieve membrane, reduces synthesis cost, and simultaneously raising gas separating performance of the SAPO-34 molecular sieve membrane.

To provide resin-coated sand for a multilayer mold in which the consolidation strength of the casting mold obtained by using it and gas permeability thereof are improved at the same time, the amount of occurrence of pyrolytic products (tar, soot and the like) derived from organic substances is effectively inhibited, when molding is performed using such a casting mold, and further, the casting mold after molding can exhibit excellent collapsibility. Disclosed is resin-coated sand for a multilayer mold, in which surfaces of refractory particles are coated with a binder composition containing a phenolic novolak resin having an ortho/para bond ratio of methylene groups of 1.5 or more and an aromatic amine as indispensable constituents, and the grain fineness number is from 80 to 150.

The invention discloses an anti-blocking intelligent valve positioner and an intelligent valve. The anti-blocking intelligent valve positioner comprises an air source purifying unit which is used for being connected with an air source; an anti-blocking electrical conversion unit which is connected with the air source purifying unit and used for controlling a valve actuator; a circuit control unit which is connected with the anti-blocking electrical conversion unit and used for transmitting a control signal to the anti-blocking electrical conversion unit; and a position feedback unit which is connected with the circuit control unit and used for detecting the actuation position of the valve actuator. The intelligent valve comprises the anti-blocking intelligent valve positioner and the valve actuator which is matched with the anti-blocking intelligent valve positioner. Intelligent valve positioning is realized, and internal blocking caused by pollution of the air source can be effectively avoided so that the anti-blocking intelligent valve positioner and the intelligent valve are particularly suitable for industrial field environment process control.