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13 results about "Synthetic membrane" patented technology

An artificial membrane, or synthetic membrane, is a synthetically created membrane which is usually intended for separation purposes in laboratory or in industry. Synthetic membranes have been successfully used for small and large-scale industrial processes since the middle of twentieth century. A wide variety of synthetic membranes is known. They can be produced from organic materials such as polymers and liquids, as well as inorganic materials. The most of commercially utilized synthetic membranes in separation industry are made of polymeric structures. They can be classified based on their surface chemistry, bulk structure, morphology, and production method. The chemical and physical properties of synthetic membranes and separated particles as well as a choice of driving force define a particular membrane separation process. The most commonly used driving forces of a membrane process in industry are pressure and concentration gradients. The respective membrane process is therefore known as filtration. Synthetic membranes utilized in a separation process can be of different geometry and of respective flow configuration. They can also be categorized based on their application and separation regime. The best known synthetic membrane separation processes include water purification, reverse osmosis, dehydrogenation of natural gas, removal of cell particles by microfiltration and ultrafiltration, removal of microorganisms from dairy products, and Dialysis.

An Ag / TiO2 / Ag3PO4 / chitosan quaternary ammonium salt / lignocellulose nanofiber / starch composite membrane, its preparation method and application

PendingCN122302382AStarch gelatinizationNanoparticle
This invention discloses an Ag / TiO2 / Ag3PO4 / chitosan quaternary ammonium salt / lignocellulose nanoparticles / starch composite membrane, its preparation method, and its applications, relating to the field of fruit and vegetable preservation technology. Chitosan quaternary ammonium salt, starch, glycerol, lignocellulose nanoparticles, and Ag / TiO2 / Ag3PO4 photocatalyst are mixed in water, and the starch is gelatinized by heating to obtain a composite film-forming solution; this solution is then cast to obtain the Ag / TiO2 / Ag3PO4 / chitosan quaternary ammonium salt / lignocellulose nanoparticles / starch composite membrane. The chitosan quaternary ammonium salt in the composite membrane can modify the surface of the Ag / TiO2 / Ag3PO4 photocatalyst, and its polar groups can form a hydrogen bond network with the hydroxyl groups of cellulose and starch, improving the composite membrane's ability to enrich ethylene and the interfacial bonding force between the photocatalyst and the matrix, thereby enhancing the composite membrane's adsorption and degradation effect on ethylene. The chitosan quaternary ammonium salt and the photocatalyst form a dual long-lasting antibacterial effect—both photoresponsive and contact-type—synergistically improving the antibacterial performance of the composite membrane.
Owner:SOUTH CHINA AGRICULTURAL UNIVERSITY

Inorganic-organic composite solid electrolyte membrane and method for manufacturing the same

This invention provides an inorganic-organic composite solid electrolyte membrane and its preparation method, belonging to the field of solid electrolyte membrane technology. The invention uses anisole and tetrahydrofuran as a mixed solvent to dissolve methyl-terminated PEO. Tetrahydrofuran weakens the interaction between the ether oxygen atoms on the PEO chain and anisole, promoting the dispersion of PEO in the mixed solvent and facilitating the formation of a homogeneous coating slurry. Meanwhile, methyl-terminated polyethylene oxide not only improves the loss of ionic conductivity after the sulfide solid electrolyte is composited with a non-ionic binder, but its methyl termination also inhibits the degradation effect of polyethylene oxide on the sulfide solid electrolyte, better preserving the high-performance characteristics of the sulfide. Furthermore, the addition of Li3PO4 increases the lithium ion transport rate in polyethylene oxide, thereby improving the ionic conductivity of the composite solid electrolyte membrane.
Owner:GUIZHOU MATERIAL IND TECH INSTITUE

Preparation method of nano-salt porous waterproof and breathable membrane

This invention relates to the field of polymer materials technology, specifically to a method for preparing a nano-salt-based porous waterproof and breathable membrane. The method includes: S1, water-soluble inorganic salts are pulverized, surface-modified, and wet-ball-milled, followed by centrifugal precipitation. The particle size distribution index of the nano-salt particles is controlled to be between 0.10 and 0.22 through gradation design, and then gently treated in a mixture of water and low molecular weight alcohol; S2, the nano-salt slurry is added to a polymer film-forming liquid, and dispersed by high-speed shearing and vacuum degassing to obtain a casting liquid, with the viscosity controlled at 5000-20000 cP at 25°C; S3, the casting liquid is coated onto a substrate and pre-dried using a temperature gradient; S4, water-soluble inorganic salts are dissolved in hot water; S5, drying. The core of this invention lies in introducing and defining the pore size conversion coefficient K as the core control target. The K value is controlled through active intervention throughout the entire process of water-soluble inorganic salt preparation, mixing, and film formation, achieving refined and quantitative adjustment of the final membrane pore size and pore size distribution.
Owner:QUANZHOU XIANGXING FABRIC RESEARCH INSTITUTE CO LTD +1

A modified graphene material and its preparation method

ActiveCN121851792BOrganic filmPolymer science
This invention relates to the field of graphene materials technology, and discloses a modified graphene material and its preparation method. The preparation method includes: modifying graphene oxide with sodium lignosulfonate through π-π stacking to prepare an aqueous stable dispersion; introducing saponified rosin acid to attach the rosin acid tricyclic hydrophobic framework to the graphene surface; compounding tung oil emulsion, utilizing the α-tung acid conjugated triene double bond to form a film through free radical oxidation polymerization at room temperature (15-35℃), and covalently bonding graphene into the organic film-forming system through phenolic radical coupling; adding zinc borate, where zinc ions catalyze curing and promote the formation of zinc rosin acid, and borate ions form an inorganic borate ester crosslinking network with the hydroxyl groups of sodium lignosulfonate; adjusting the solid content and grinding to obtain the finished product. The conductive ink prepared by this invention self-cures at room temperature, and the cured coating has excellent water resistance and conductivity stability, making it suitable for heat-sensitive flexible substrates.
Owner:HUNAN SANMO NEW MATERIAL CO LTD

Highly infiltrative long-circulation lithium battery composite diaphragm, and preparation method and application thereof

The application relates to a high-wetting long-circulation lithium battery composite diaphragm and a preparation method and application thereof, wherein the method comprises the following steps: obtaining a carbonate-based electrolyte formula, adding a composite film forming agent, forming a mixed solution, and stirring until uniform; in the process of stirring the mixed solution, nano-aluminum oxide particles are added for catalysis, the particle size range of the nano-aluminum oxide particles is controlled to be 50-100 nanometers, cellulose is added to the mixed solution, the solution viscosity is adjusted, and the mixed solution is formed into a stable suspension system; the mixed solution in the suspension system state is injected and uniformly covered on the surface of a battery diaphragm, the mixed solution attached to the battery diaphragm is solidified under high-temperature conditions of 150-200 DEG C, a uniform dendrite-free diaphragm protection layer is formed, and the purposes of improving the electrolyte wetting property of a lithium battery diaphragm, prolonging the cycle life of a battery and maintaining high coulomb efficiency are achieved.
Owner:XIAMEN DONESTY ECOMMERCE CO LTD

Super-hydrophobic polylactic acid separation membrane, and preparation method and application thereof

The application relates to the technical field of membrane separation materials, in particular to an ultrahydrophobic polylactic acid separation membrane and a preparation method and application thereof. The application realizes chemical crosslinking of polylactic acid and hydroxyl groups of a base film by introducing hexamethylene diisocyanate (HDI) as a crosslinking agent through targeted modification of the base film, improves the combination stability and structural integrity of the composite film by combining polylactic acid-polyethylene glycol composite membrane forming and pore forming processes, realizes efficient and rapid separation of an oil-water mixture, and simultaneously considers the mechanical strength and environmental friendliness of the membrane.
Owner:DALIAN POLYTECHNIC UNIVERSITY

Polybutylene terephthalate and polyester film

PendingJP2026110776APolytetramethylene terephthalatePolymer science
The present invention provides polybutylene terephthalate, which has a sufficiently low volume resistivity at temperatures suitable for film formation and enables high-speed film formation, and a polyester film using this polybutylene terephthalate. [Solution] The volume resistivity at 250°C (ρV(250°C)) is 13 × 10 7 Polybutylene terephthalate with a resistivity of Ω·cm or less. Preferably, the volume resistivity at 285°C (ρV(285°C)) is 10 × 10⁻¹⁰. 7 Polybutylene terephthalate with a resistivity of Ω·cm or less, and a ratio of the volume resistivity at 250°C (ρV(250°C)) to the volume resistivity at 285°C (ρV(285°C)) (ρV(250°C) / ρV(285°C)) of 3.0 or less. A polyester film made by forming a film-forming material containing 50% by mass or more of this polybutylene terephthalate.
Owner:MITSUBISHI CHEM CORP

Environment-friendly multifunctional film spreading agent and preparation method and application thereof

PendingCN122123369ABiocideFungicidesWater ChestnutsComposite film
This invention discloses an environmentally friendly, multifunctional spreading agent, its preparation method, and its application. The spreading agent consists of a plant-derived base oil, a composite film-forming system, a natural surfactant, and a synergist. The mass percentages of each component are: plant-derived base oil 40%-65%, composite film-forming system 15%-30%, natural surfactant 5%-15%, synergist 2%-8%, and the remainder is an environmentally friendly solvent. This spreading agent contains no chemical pesticide components and achieves targeted biological control through physical sealing and interfacial tension regulation. It features rapid spreading speed, large coverage area, long-lasting effect, and environmental friendliness. This spreading agent can quickly form a uniform and dense oil film on the water surface, effectively killing aquatic pests such as schistosomiasis cercariae and mosquito larvae. It also has an auxiliary control effect on pests and diseases of aquatic crops such as rice and water chestnuts.
Owner:INST OF PARASITIC DISEASE PREVENTION & CONTROL CHINESE CENT FOR DISEASE CONTROL & PREVENTION (NAT RES CENT FOR TROPICAL DISEASES) +2

Highly transparent low-haze cellulose composite and method for producing the same

PendingCN122344340ACelluloseNatural fiber
The application relates to the technical field of functional film preparation, and discloses a high-transparency low-haze cellulose composite material and a preparation method thereof, which comprises the following preparation steps: S1, after alkali activation of refined cotton raw materials, monochloromethane and propylene oxide are sequentially introduced to carry out reaction, and modified HPMC powder is prepared; S2, after sulfur hydrolysis of another refined cotton raw material, alkali activation is carried out, and then propylene oxide is introduced to carry out reaction, and a modified CNC system suspension is prepared; S3, the modified HPMC powder and the modified CNC system are compounded, film forming, crosslinking and drying, and a high-transparency low-haze composite film is obtained. In the technical scheme, natural cellulose raw materials are adopted, the compatibility of two phases is improved through homologous modification, the preparation process condition is mild, the obtained material is biodegradable, and the material has environmental friendliness and functional stability.
Owner:NINGJIN WANQIANG BIOTECHNOLOGY CO LTD

pH-responsive food spoilage indicator film based on carboxymethyl chitosan sodium alginate and preparation method thereof

PendingCN122167832AFlexible coversWrappersBiotechnologyNatural source
This invention belongs to the field of food packaging materials technology and discloses a pH-responsive food spoilage indicator film based on carboxymethyl chitosan and sodium alginate, and its preparation method. This invention provides a smart packaging film that integrates pH-responsive color change and active antibacterial functions within a single film layer. The film uses carboxymethyl chitosan and sodium alginate as the composite film-forming substrate, and simultaneously loads anthocyanins as a pH indicator and magnolol as a natural antibacterial agent. This invention is prepared by a casting method, which is simple. The film exhibits sensitive pH-responsive color change capability for amines produced by food spoilage, enabling real-time visual early warning of the spoilage process; simultaneously, magnolol and carboxymethyl chitosan synergistically endow the film with broad-spectrum antibacterial activity, actively extending the shelf life of fresh food. All components of this invention are derived from natural sources and have biodegradable capabilities, providing a simple, functionally integrated, green, and safe smart packaging solution for fresh food.
Owner:DALIAN UNIV

A coating agent for pervious concrete and a method for preparing the same

This application relates to the field of overlay materials, and more specifically to an overlay agent for permeable concrete and its preparation method. The overlay agent for permeable concrete, by weight, comprises at least the following raw materials: 60-80 parts silicone-acrylic emulsion, 4-8 parts composite film-forming agent, 0.6-1.2 parts wetting agent, 4-10 parts functional agent, 0.4-0.8 parts defoamer, 1-3 parts inorganic thickener, 5-12 parts color paste, and 10-20 parts deionized water. The overlay agent prepared in this application not only possesses advantages such as high hardness, strong adhesion, and good hydrolysis resistance, but also maintains good weather resistance, a long open time, and salt and alkali resistance, fully meeting the comprehensive performance requirements of permeable concrete in complex environments.
Owner:GUANGDONG XINHAOYUAN TECH CO LTD