89 results about "Microporous membranes" patented technology

The aim of the present invention is to provide a microporous multilayer separator and a secondary battery comprising same, the microporous multilayer separator having a low coating weight per unit area, a thin coating layer, and a low heat shrinkage rate, and thus having improved energy density and safety, thereby being suitable for use in a lithium-ion secondary battery. To this end, provided is a microporous multilayer separator, comprising: a polyolefin-based microporous membrane; and an inorganic coating layer which is applied on one side or both sides of the microporous membrane and in which two or more types of inorganic particles are bound by an organic binder, wherein the inorganic particles comprise first inorganic particles and second inorganic particles, wherein the first inorganic particles have an average diameter (D50) of 0.1-10.0 μm, and the second inorganic particles have an average diameter (D50) of 50 % or less of the average diameter (D50) of the first inorganic particles.

This invention relates to the field of pet care product technology, and discloses a pet oral care spray and its preparation method. The preparation method employs a low-temperature gradient stepwise dissolution process: glucose oxidase is pre-dissolved at low temperature to obtain pre-solution A; bovine colostrum powder and lactoferrin are dissolved at low temperature to obtain protein pre-solution B; honey, folic acid, and vitamin D3 are dissolved at room temperature to obtain excipient pre-solution C; lysozyme is added to protein pre-solution B and stirred to dissolve; then pre-solution A and excipient pre-solution C are combined sequentially, the pH is adjusted, and purified water is added to make up the volume; the mixture is filtered through a microporous membrane for sterilization, and then filled and sealed under inert gas protection. This preparation method effectively protects the biological activity of each active protein and enzyme, achieving a long shelf life without the need for additional chemical preservatives. The resulting spray does not contain irritating ingredients such as alcohol and menthol, and is suitable for improving stomatitis, inhibiting plaque and tartar, and alleviating halitosis in pets of all ages and breeds.

The utility model discloses a standard metric thread waterproof and breathable pressure balance valve, include: upper cover, surface circumferential even distribution several U shape through -hole, be used for air exchange and block foreign matter and enter, base, with upper cover cooperation and connection, constitute valve body main part, inner cover, be located on the channel of inside air exchange of base, waterproof and breathable membrane, make by the modification treatment of the surface hydrophobic oleophobic of expanded polytetrafluoroethylene ePTFE microporous membrane, micropore diameter is 0.01~15um, fixed in the air intake side of inner cover, form waterproof and breathable barrier, through above -mentioned mode, the utility model can effectively solve the sealing problem of new energy automobile battery package in the use process because of the internal and external pressure difference, prevent the invasion of water vapor, dust and chemical liquid simultaneously, guarantee the safe operation of battery package, prolong the battery life, improve the reliability and safety of new energy automobile.

A microporous membrane is provided comprising 1) an organic polymeric matrix and 2) a particulate filler distributed throughout the matrix. The matrix comprises: a polyolefin component comprising ultra-high molecular weight polyethylene present in the organic polymeric matrix in an amount of 1 to 80 wt%; and an aliphatic polyketone polymer present in the organic polymeric matrix in an amount of 1 to 80 wt%. The particulate filler exhibits a total particle size in the range of 5 to 40 microns, is distributed throughout the organic polymeric matrix, and is present in the microporous membrane in an amount of 10 to 90 wt% based on the total weight of the microporous membrane, as determined by use of a laser diffraction particle size instrument.

This invention relates to a method for determining the migration amounts of 4,4'-biphenyl and 1,1'-sulfonyl di(4-chlorobenzene), belonging to the technical field of migration amount determination. The method includes the following steps: S1: conducting a migration experiment; S2: treating the soaking solution; S3: preparing a chemical substitute solution; taking 2 mL of the chemical substitute reagent (95% ethanol or isooctane) soaking solution obtained after the migration experiment into a 10 mL stoppered graduated glass tube, accurately adding 50 μL of dimethyl sulfoxide, mixing, blowing with nitrogen to near dryness under a 45°C water bath, making up to 2 mL with acetonitrile-water solution (1+1), mixing, filtering through a microporous membrane, and preparing for determination; S4: preparing a blank solution; S5: sample determination; S6: blank determination; S7: verifying the recovery rate and precision of the method using the above blank sample, selecting the detection limit and quantitation limit for two-level experiments at two concentrations.

The application discloses a movable membrane-shaped metamaterial sound barrier, which comprises a thin film noise reduction unit and a structure fixing unit for arranging and fixing the thin film noise reduction unit, wherein the thin film noise reduction unit comprises a microporous membrane, a first cavity, a first sound insulation layer, a second cavity and a second sound insulation layer arranged along the sound wave propagation direction, and the microporous membrane is provided with a plurality of micropores for absorbing sound waves; when sound waves enter the first cavity through the microporous membrane, the micropores and the first cavity are used for preliminary noise reduction to reduce reflected sound generated by the sound waves; the sound energy of the transmitted sound waves is reduced through the first sound insulation layer and the second sound insulation layer; and the sound energy of the transmitted sound waves is further reduced through the second cavity. The application further provides an installation method. The sound barrier provided by the application is convenient to disassemble and assemble and has the effects of sound insulation and sound absorption, so that the noise pollution of construction equipment in a construction site can be effectively reduced.

To provide a method of making a multilayer microporous membrane with improved shutdown, improved strength, and improved dielectric breakdown strength.SOLUTION: A method of making a multilayer microporous membrane comprises: extruding each of a polypropylene precursor comprising a plurality of sublayers, and a polyethylene precursor comprising a plurality of sublayers; laminating the extruded polypropylene and polyethylene precursor layers to produce a first intermediate precursor having a structure with alternating polyethylene and polypropylene precursors; simultaneously or singly laminating a first outer layer comprising one of the extruded polypropylene precursors to a first surface of the intermediate precursor and a second outer layer comprising one of the extruded polypropylene precursors to a second surface of the first intermediate precursor opposite the first surface so as to produce a second intermediate precursor; annealing the second intermediate precursor to produce an annealed multilayer membrane; and uniaxially or biaxially stretching the annealed multilayer membrane to produce a microporous multilayer membrane.SELECTED DRAWING: Figure 1

The present application discloses a composite microporous membrane, comprising a hydrophilic base membrane and a coating layer coated on one side or both sides of the hydrophilic base membrane, wherein the hydrophilic base membrane comprises a first fluorine-containing polymer and one or more first hydrophilic grafts grafted thereon, the coating layer comprises a second fluorine-containing polymer and one or more second hydrophilic grafts grafted thereon, and hydrophilic nanoparticles, wherein the first fluorine-containing polymer is the same as the second fluorine-containing polymer, and the composite microporous membrane has low surface resistance, high ionic conductivity and low mass loss rate.

This invention discloses an absolute quantification method for pathogens and drug resistance genes in atmospheric bioaerosols and its application. Addressing the bottleneck of achieving absolute quantification of low-concentration samples while maintaining cell integrity and high-concentration nucleic acid extraction, this invention constructs a collection carrier by immobilizing a hydrophilic mixed cellulose ester microporous membrane on a technical agar plate. This is combined with a flow rate ≤30 L / min impactor sampler, ensuring structural integrity while capturing microorganisms, laying the foundation for flow cytometry quantification. This front-end collection system is deeply coupled with a dedicated cascade lysis and concentration process, enabling the acquisition of high-quality DNA suitable for metagenomic library construction and relative abundance analysis even under short-term, low-flow-rate collection. Simultaneously, the total microbial count is absolutely quantified using flow cytometry on the collected samples, and this result is fused with the relative abundance results. Through synergistic optimization of the entire chain, quantitative analysis of species-level pathogens and drug resistance genes in atmospheric bioaerosols is ultimately achieved.

The technical scheme of the present application discloses a continuous preparation process of industrial glyoxylic acid, and belongs to the technical field of fine organic chemical industry and glyoxylic acid synthesis. The main innovation of the present application is to introduce microfluidic technology and microporous membrane separation technology into the synthesis process, and to use a composite catalyst to catalyze the air oxidation of glyoxal to synthesize glyoxylic acid. Compared with the prior art, the present application has the following obvious beneficial effects: (1) the process is safe, continuous, fast, high in production efficiency and small in space occupation; (2) no waste water, waste gas and waste solid are produced, and the recycled water can be recycled, which is very beneficial to environmental protection and water resource saving; (3) the composite noble metal catalyst is low in consumption, and the conversion rate of glyoxal is greatly improved; and (4) the present application has the characteristics that high-content glyoxylic acid can be obtained without distillation and concentration, which is very beneficial to reducing the production cost.

This application relates to the field of three-dimensional cell or organoid in vitro culture devices, specifically to an exhaust system for an automated liquid-changing in vitro culture device, which achieves efficient bubble blocking and adaptive discharge through hydrophilic microporous membranes installed in the upper and lower membrane chambers, as well as pressure relief branches and pressure relief valves.

This invention relates to the field of membrane materials technology, specifically to a biaxially stretched polyolefin film, its preparation process, and its applications. This invention solves the problem of uneven microstructure caused by non-uniform preheating and stretching of thick gel castings in existing technologies through a specific heat-setting process. It provides a gel film precursor with uniform three-dimensional properties (i.e., along the film production line's forward direction, width direction, and thickness direction) for subsequent stretching, thereby obtaining a microporous membrane with narrower pore size distribution and a more regular structure. It also solves the problem of the limiting stretching ratio restricted by the accumulation of stress within the connecting chains in existing stretching processes. By relaxing stress and widening the process safety window, it enables higher-ratio uniform biaxial stretching, thereby improving the final mechanical strength (such as tensile strength) and air permeability of the microporous membrane.

The utility model relates to a kind of multi-axle heavy ion microporous membrane full-automatic irradiation device, including the following components of split design: roll membrane discharger, including several roll membrane discharging assemblies, several roll membrane discharging assemblies are arranged into several columns side by side;Roll membrane collector, including several roll membrane collecting assemblies, several roll membrane collecting assemblies are arranged into several columns side by side, the column number of several roll membrane collecting assemblies arrangement is same with the column number of several roll membrane discharging assemblies arrangement, roll membrane discharger and roll membrane collector between it is provided with link shaft, steering shaft, transmission shaft, for connecting roll membrane;Heavy ion beam vacuum cavity, between roll membrane discharger and roll membrane collector, for irradiation through the roll membrane of link shaft;Robot, respectively in the material inlet end of roll membrane discharger and the material outlet end of roll membrane collector. Full-automatic feeding and discharging can be realized, multi-angle beam current detection and beam current follow-up are realized, automatic material collecting and rectifying function is realized, and beam irradiation window realizes the automatic adjustment of temperature control.

The utility model belongs to atmospheric sampling technical field especially relates to an atmospheric sampling device, include: the round tub one, the detachable installation round tub two on the round tub one upper end, the bucket groove two is established on the round tub two upper end, the filter screen is fixed in the bucket groove two inside bottom, the ring is fixedly installed in the filter screen, the fixed disc is fixed in the bucket groove two inside upper end, the screw thread disc is detachably installed in the fixed disc, the hydrophobic microporous membrane is fixed in the screw thread disc, the rubber sealing ring is fixed in the hydrophobic microporous membrane, the pipeline is fixed in the rubber sealing ring, the mounting plate is fixedly installed in the pipeline, the fan blade is rotatably connected to the mounting plate lower end, the threaded rod is fixed to the fan blade bottom, the threaded rod bottom penetrates the installation ring and extends into the round tub one, the threaded rod bottom penetrates the moving disc, and is threadedly connected. The utility model has the advantages that air and foreign particles in the atmosphere can be separated and sampled at the same time, the diversity and efficiency of the function are improved, and installation and dismounting are facilitated.

This invention proposes a polybenzimidazole microporous ion-conducting membrane and its one-step electrospray preparation method. Polybenzimidazole electrospray solutions are prepared using organic solvents with different boiling points. Electrospray parameters are adjusted under a high-voltage electrostatic field, and the polybenzimidazole electrospray solution is dispersed into nanodroplets using this field. A receiving roller rotates to spread and layer the droplets, followed by rapid drying and solidification, directly preparing the polybenzimidazole microporous membrane. This invention can directly prepare microporous membranes using non-ionic polymer materials, and the membrane preparation process is simple and easily scaled up. It overcomes the problem of high mass transfer resistance of non-ionic polymers, enabling highly selective proton conduction. Simultaneously, the high stability of non-ionic polymers improves the oxidative stability and mechanical strength of the ion-conducting membrane, showing broad application prospects in the field of new energy storage flow batteries.

This invention discloses a cell proliferation culture device, belonging to the field of biomedical experimental equipment technology, comprising: a culture body, a microporous membrane, a microfluidic channel, a temperature control module, a sensor module, a sampler, and a control unit. The cell proliferation culture device of this invention can dynamically monitor the glucose consumption rate and lactate production rate during cell proliferation in real time, supports pollution-free dynamic sampling and rapid microenvironment switching, and is particularly suitable for studying the interaction between SIRT2 and HKII to regulate aerobic glycolysis and growth proliferation of colorectal cancer cells. It also has advantages such as real-time monitoring, high sensitivity, pollution-free sampling, and dynamic microenvironment control.

The invention discloses a SO3 gas multistage PTFE microporous membrane filtration and purification device, and relates to the technical field of gas filtration, the SO3 gas multistage PTFE microporous membrane filtration and purification device comprises a filter barrel, a first filter plate and a membrane cylinder unit, the top of the first filter plate is rotatably connected with the membrane cylinder unit, the outer side of the membrane cylinder unit is provided with a microporous membrane layer, and the top of the first filter plate is slidably connected with a mounting cylinder; a film roll is arranged in the mounting cylinder, and a limiting frame is mounted on the outer wall of the mounting cylinder. The thickness of the microporous membrane layer on the outer side of the rotatable membrane cylinder unit is adjusted by arranging the rotatable membrane cylinder unit, the contact time of SO3 gas and the microporous membrane is prolonged, the gas filtering effect of the microporous membrane is improved, when the thickness of the microporous membrane layer is increased, the position of the installation cylinder can be automatically adjusted, and after the microporous membrane layer forms a complete ring layer, the installation cylinder can be automatically adjusted. The rotating frame is embedded into the clamping groove to fix the limiting frame, so that the mounting cylinder is kept in a stable state in the gas filtering process, the microporous membrane layer is fixed in an auxiliary manner by utilizing the mounting cylinder, the microporous membrane layer is prevented from loosening, and the SO3 gas filtering effect is favorably improved.

This invention discloses an antibacterial drainage bag medical membrane and its preparation process, belonging to the field of medical device technology. The medical membrane has a multi-layer composite structure, comprising, from the outside to the inside: a breathable and antibacterial outer layer, a structurally reinforcing intermediate layer, and an antibacterial inner layer; the breathable and antibacterial outer layer is a hydrophilically modified polyurethane microporous membrane; the structurally reinforcing intermediate layer is a polypropylene or polyethylene nonwoven fabric; the antibacterial inner layer is a polyvinyl alcohol-chitosan blend membrane loaded with a composite antibacterial agent, which is composed of inorganic and organic antibacterial components; each layer is laminated and fixed by hot melt adhesive bonding or hot pressing. The preparation process includes preparing the breathable and antibacterial outer layer and the antibacterial inner layer separately, and then laminating them with the intermediate layer. This invention solves the problems of retrograde bacterial infection and putrefaction and odor of drainage fluid in existing drainage bags through gradient antibacterial and synergistic functional design of "moisture permeability and antibacterial effect - mechanical reinforcement - contact sterilization," and has the advantages of high-efficiency antibacterial, high breathability and antibacterial effect, and good mechanical properties.

A bioreactor includes a first shell a first outer membrane and the first growth membrane. The first shell includes a first sidewall and a first end wall. The first sidewall defines a first chamber and has a first open end and a second open end that is opposite the first open end. The first end wall extends across the first open end of the first sidewall. The second shell includes a second sidewall that defines a second chamber. The first outer membrane is secured to the first end wall and is configured to substantially seal the first chamber at the first end wall. The first growth membrane is disposed in the second chamber. The first growth membrane is microporous and is configured to allow liquid media to pass through while retaining cells with in the second chamber.

This disclosure provides a composite cooling film comprising a microporous film layer having a solar-weighted reflectivity of 0.8 or greater for vertically incident electromagnetic radiation with wavelengths ranging from 400 nanometers (nm) to 2500 nm. The composite cooling film also includes a UV-reflective composite layer disposed adjacent to the main surface of the microporous film layer. The UV-reflective composite layer comprises a polymer matrix and inorganic particles distributed within the polymer matrix. The UV-reflective composite layer exhibits an average electromagnetic radiation reflectivity of at least 55% over a wavelength bandwidth of at least 30 nm in the wavelength range of 300 nm to at most, but not including, 400 nm.

This utility model belongs to the field of protective clothing fabric technology, specifically a heat-insulating fabric for protective clothing, comprising an outer flame-retardant layer, a middle heat-insulating layer, and an inner skin-friendly layer; the heat-insulating layer is an aerogel film layer, with its heat-source-facing sidewall covered with a nano-high reflective film; the heat-source-facing sidewall of the flame-retardant layer is covered with a polytetrafluoroethylene microporous membrane; the flame-retardant layer, heat-insulating layer, and skin-friendly layer are bonded together with an adhesive. This comprehensively addresses the challenges of physical protection (flame retardancy, heat insulation, liquid resistance) and wearing comfort (lightweight, breathable), thus comprehensively improving the overall performance and user experience of protective clothing.

This invention discloses a method for purifying and distilling hydrochloric acid, belonging to the field of compound purification technology. This method involves sequentially processing industrial-grade hydrochloric acid through high-level temporary storage, atmospheric pressure distillation, condensation and collection, quality testing, and filtration to achieve the graded removal of volatile and non-volatile impurities. The filtration step employs a filtration device composed of two long-lasting microporous membranes. These microporous membranes are polytetrafluoroethylene (PTFE) long-lasting microporous membranes prepared using a specific lubricant system, possessing a stable microporous structure and excellent resistance to strong acids. Simultaneously, the hydrochloric acid waste gas generated during distillation and packaging is treated with water absorption, achieving waste gas treatment and resource recovery. Compared with existing technologies, this invention features a simple process flow, strong applicability, high filtration stability and operational reliability, effectively improving the quality of hydrochloric acid purification and reducing overall system operational risks, making it suitable for industrial-scale application.

This invention discloses a method for preparing Ganoderma lucidum polypeptides, belonging to the field of biotechnology. Addressing the problems of incomplete cell wall disruption, low enzymatic hydrolysis efficiency, and low polypeptide yield in existing Ganoderma lucidum polypeptide preparation processes, this invention employs ultrasound-assisted compound enzymatic hydrolysis combined with freeze-drying technology to achieve efficient preparation. Using dried Ganoderma lucidum fruiting bodies as raw material, the product is pretreated to obtain ultrafine powder. Cell walls are disrupted through intermittent ultrasonic pretreatment with specific material-to-liquid ratios and ultrasonic parameters. Then, a compound enzyme consisting of alkaline and neutral proteases is used for synergistic enzymatic hydrolysis. Following enzyme inactivation centrifugation, microporous membrane purification, vacuum concentration, and vacuum freeze-drying, Ganoderma lucidum polypeptide powder is finally obtained. The process conditions of this invention are mild and environmentally friendly, significantly improving protein dissolution rate and enzymatic hydrolysis efficiency. The obtained Ganoderma lucidum polypeptides contain at least 85% small molecule peptides (molecular weight ≤3000 Da), resulting in a significantly improved polypeptide yield while fully preserving polypeptide bioactivity. The product has high purity and good solubility, making it suitable for industrial-scale production and applicable to a wide range of food, health product, and pharmaceutical fields.

This invention discloses a hydrogel-modified membrane and its preparation method. The preparation method of the hydrogel-modified membrane is as follows: under light-protected inert atmosphere, tert-butylaminoethyl methacrylate, vinylpyridine, and a photoinitiator are added to water and mixed to obtain a premixed solution. The premixed solution is then irradiated with low-intensity ultraviolet light to obtain a grafting modification solution. A polypropylene microporous membrane is then immersed in the grafting modification solution and irradiated with high-intensity ultraviolet light before the membrane is removed. The modified polypropylene microporous membrane is then washed with an organic solvent and water to obtain the hydrogel-modified membrane. This invention effectively solves the problem of easy degradation of tert-butylaminoethyl methacrylate in water after ultraviolet irradiation by utilizing a prepolymerization reaction, making tert-butylaminoethyl methacrylate applicable to the preparation of hydrophilic gel layers. The modified polypropylene microporous membrane prepared by this invention has high water flux and a small water contact angle, significantly improving the hydrophilicity of the polypropylene microporous membrane and expanding the application range of polypropylene membrane materials in aquatic environments.

The application discloses a preparation method of a super-hydrophobic antistatic microporous membrane based on a modified microfibrillated cellulose framework, wherein microfibrillated cellulose is modified to obtain hydroxyapatite modified microfibrillated cellulose, which is further self-assembled with a conductive substance to form an interlaced cellulose framework, so that the oil-water separation flux is greatly improved; the self-assembly with the conductive substance also endows the microporous membrane with antistatic property, and the surface resistivity is less than 10 11 Ω; the microporous membrane prepared by compounding with polydimethylsiloxane has super-hydrophobic property, and the surface water contact angle is more than 150°; the super-hydrophobic antistatic microporous membrane prepared based on the method has excellent oil-water separation flux and oil-water separation efficiency, and has high stability, so that the wide application of the oil-water separation technology is promoted.

The utility model discloses an ultrasonic physiotherapy electrode piece with slow -release layer, including backing layer, the bottom of the middle part round hole of backing layer is equipped with copper foil, the downside of copper foil is equipped with microporous membrane, the downside of microporous membrane is equipped with medicine slow -release layer, still including connecting mechanism, connecting mechanism: it includes arc connecting seat no.

The application discloses a composite functional diaphragm for a zinc-bromine flow battery and a preparation method thereof, and belongs to the technical field of electrochemical energy storage. The diaphragm is based on a microporous membrane or an ion exchange membrane, and a first functional coating facing a positive electrode and a second functional coating facing a negative electrode are constructed on two surfaces of the diaphragm. The first functional coating is composed of a dense nanocomposite network formed by cross-linking quaternary ammonium chitosan and inorganic nanoparticles through a cross-linking agent. The second functional coating is composed of a porous zincophilic composite layer formed by cross-linking quaternary ammonium chitosan and micron-sized zinc powder through a cross-linking agent. By preparing a slurry and coating, a structure-stable asymmetric composite functional diaphragm is formed after solidification. The diaphragm can efficiently anchor polybromide on the positive electrode side to inhibit shuttling, and can induce uniform zinc deposition on the negative electrode side to inhibit dendrites, while ensuring excellent chemical and mechanical stability of the coating in a strong acid and high bromine environment, so that the overall performance of the zinc-bromine flow battery is synergistically and long-acting improved.

This invention relates to the field of traditional Chinese medicine and health food preparation technology, and discloses a selenium-enriched medicinal and edible compound preparation for improving diabetic encephalopathy, as well as its preparation and application. The preparation is made from a specific weight ratio of Codonopsis pilosula, Astragalus membranaceus, Polygonatum sibiricum, selenium-enriched Corydalis yanhusuo, and Morus alba leaves. The preparation method includes raw material pulverization, constant-temperature reflux extraction with water, filtration and purification using a 0.22μm microporous membrane, vacuum low-temperature concentration to extract, and addition of excipients to form granules, capsules, or tablets. This invention constructs a multi-target synergistic network integrating qi replenishment, blood sugar control, and nerve protection through scientific formulation. It utilizes the strong antioxidant properties of organic selenium to efficiently scavenge free radicals in the brain, improving cognitive impairment caused by diabetic encephalopathy and lowering blood sugar. Combined with a mild closed-loop process and microfiltration technology, it ensures the stability and dissolution rate of heat-sensitive active ingredients, improving the purity, safety, and batch-to-batch consistency of the preparation.

This utility model discloses a check device for a microporous aerator used in wastewater treatment, belonging to the field of wastewater treatment. It includes a microporous aerator body, with a microporous membrane at the upper end and a connector fixedly installed at the lower end. The connector is connected to a cavity within the microporous aerator body. A connecting pipe is movably installed at the lower end of the connector, with threaded caps at both ends. The threaded cap at the upper end of the connecting pipe is threaded onto the lower end of the connector. A check component for wastewater backflow is installed inside the connecting pipe. This check component effectively and quickly prevents wastewater backflow when aeration stops, avoiding a reduction in wastewater treatment efficiency and protecting the stable operation of the wastewater treatment system. Because it effectively prevents wastewater backflow, the treatment effect of the microporous aerator body is fully realized.