27 results about "Cellulose acetate membrane" patented technology

The invention provides a multi-stage synergistic wound repair nanofiber membrane and a preparation method thereof. The composite fiber membrane sequentially comprises an electrostatic spinning pullulan / tannic acid / tranexamic acid nanofiber membrane for promoting the formation of blood clots, a polydopamine / calcium chloride modified electrostatic spinning cellulose acetate membrane with coagulating, antibacterial and repairing effects, and a chitosan composite cellulose non-woven fabric, and the electrostatic spinning pullulan / tannic acid / tranexamic acid nanofiber membrane is a wound surface contact layer. The nanofiber membrane has the functions of a physical hemostasis barrier and continuously releasing regeneration promoting biological signals, and a dynamic hemostasis healing process is formed.

The invention discloses a construction method and an evaluation method for evaluating and regulating the optical performance of a cellulose acetate film. The construction method comprises the following steps: S1, molecular modeling: carrying out molecular modeling on an acetyl substituted monomer of cellulose acetate; s2, obtaining components alpha xx, alpha yy and alpha zz of polarizability in different coordinate directions corresponding to different wavelengths; s3, constructing a function relationship between the intrinsic birefringence delta n0 (monomer) of a certain monomer of the cellulose acetate monomer and the intrinsic birefringence delta n0i of a certain conformational isomer of the monomer; s4, respectively solving the intrinsic birefringence contributions of 2, 3 and 6 acetyl groups; s5, obtaining substitution degree distribution of 2, 3 and 6 bits; and S6, constructing a CA birefringence function relationship, and solving theoretical birefringence. According to the method, a logical relationship is established between the substitution degree of hydroxyl and acetyl in each monomer conformation, the conformation ratio and the birefringence, a theoretical value that the birefringence of the cellulose acetate is closer to an actual value is obtained, and an effective method is provided for accurate prediction and regulation of optical performance.

The application relates to a high-strength high-separation-performance carbon molecular sieve hollow fiber membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing cellulose acetate, cellulose, an organic solvent and an ionic liquid to prepare a casting solution, and stirring and heating the casting solution; (2) vacuumizing and defoaming the casting solution, and preparing a hollow fiber cellulose acetate membrane by using a dry-wet spinning method; and (3) drying the hollow fiber cellulose acetate membrane, and preparing the high-strength high-separation-performance carbon molecular sieve hollow fiber membrane by carbonizing under temperature rise in a protective atmosphere. Compared with the prior art, the carbon molecular sieve hollow fiber membrane has good gas separation performance and high strength. The carbon molecular sieve membrane is used for He / CH4 separation, has high He permeation performance and a high He / CH4 separation factor, has good gas separation performance under high pressure, and provides a new choice for natural gas helium extraction membrane materials.

The application discloses a kind of oil-containing water body separation membrane for refining process of Bupleurum volatile oil and preparation method and application.The preparation method of the application is first mixed and dissolved according to proportion with cellulose acetate and cellulose nitrate powder, form casting membrane liquid, and the base membrane is prepared using non-solvent phase conversion method;Second, the film is deacetylated;After that, it is soaked in acyl chloride n-hexane solution for crosslinking;Finally, by in-situ hydrolysis of silane coupling agent on the membrane surface, a hydrophobic surface is prepared, and an oil-containing water body separation membrane for refining process of Bupleurum volatile oil is obtained.This method forms a hydrophobic layer on the surface of the membrane, which strengthens the rapid passage of Bupleurum volatile oil molecules and inhibits the penetration of water;Using the oil-containing water body separation membrane avoids the formation of emulsion during oil-water separation, showing high separation efficiency and stability, and widening the application of cellulose acetate membrane in traditional Chinese medicine preparation process.

The application discloses a high-transparency nano-resin lens, which comprises a resin substrate, a nano-cellular membrane layer adhered to the front surface of the resin substrate through an organic silica gel layer, the nano-cellular membrane layer comprising an inner thermoplastic polyurethane film, a polyvinyl alcohol film, a triacetate cellulose film and an outer thermoplastic polyurethane film, and a functional membrane layer plated on the surface of the nano-cellular membrane layer; wherein the nano-cellular membrane layer has a honeycomb structure. The nano-cellular membrane layer with the honeycomb structure is arranged to improve the light transmittance of the resin lens, enhance the definition and reduce the interference of stray strong light.

The utility model discloses a kind of polarizing sheets with double-sided adhesive, including polarizer, the top and bottom of the polarizer are all fixedly connected with triacetate cellulose film, the outside of triacetate cellulose film is fixedly connected with polarizer layer, the outside of the polarizer layer is fixedly connected with adhesive film, the outside of the adhesive film is fixedly connected with release film, the outside of the release film is fixedly connected with scratch-resistant coating, the outside of the scratch-resistant coating is fixedly connected with reinforcing coating strip, the inside of the scratch-resistant coating is provided with ceramic fine powder particle layer, the ceramic fine powder particle layer cooperates with scratch-resistant coating and uses, the bottom of the ceramic fine powder particle layer is provided with carbonized nitrogen powder layer.The utility model polarizing sheet changes traditional in storage or handling process, very easy to encounter friction scratch and other phenomena, scratch-resistant coating and reinforcing coating strip are used to carry out scratch-resistant reinforcing treatment, so that it can guarantee that its service performance will not be damaged due to external force, increase its service life.

The invention discloses a modified cellulose acetate dialysis membrane and a preparation method thereof.The preparation method comprises the following steps that after a cellulose acetate membrane is hydrolyzed for 1 min, the acetyl part of the cellulose acetate membrane is removed, then the cellulose acetate membrane with the acetyl part removed is subjected to an oxidation reaction, and the cellulose acetate membrane with the acetyl part removed is obtained; a selective oxidation catalyst A and / or a co-catalyst B are / is used in the oxidation reaction process, and an oxidant C is one of sodium hypochlorite, sodium chlorite, calcium hypochlorite, hydrogen peroxide, persulfate or sodium periodate; and then adding chitosan which is subjected to crosslinking modification by dialdehyde cellulose to carry out grafting reaction. According to the method, the grafting effect can be optimal only through the synergistic cooperation of the carboxyl active site amount and the crosslinking degree of the chitosan, and the urea adsorption capacity and the blood compatibility of the cellulose acetate membrane are remarkably improved.

This invention relates to the field of cellulose acetate (TAC) membrane technology, specifically to a cellulose acetate membrane and its preparation method. The components include a solvent and solid components, by weight, wherein the solid components include: 80-110 parts cellulose, 5-10 parts plasticizer, and 0.1-5 parts benzotriazole derivative, with the solid components comprising 10-30 wt% of the total components. The prepared TAC membrane exhibits the following characteristics: fewer than 3 precipitates on the membrane surface; after high-temperature and high-humidity aging for 1000 h, the TAC membrane has a ΔE value < 0.10, a Δtsb transmittance (380nm-550nm value) < 0.5, and the area ratio of point-like, oily, and contaminant precipitates on the membrane surface is < 1%.

The invention discloses a preparation method and application of Chinese herbal medicine hydrogel. The preparation method of the Chinese herbal medicine hydrogel comprises the following steps: (1) preparing keratinocyte vesicles by taking keratinocytes as a raw material, then adding asiaticoside, and extruding back and forth through a cellulose acetate membrane to obtain keratinocyte loaded asiaticoside vesicles; and (2) diluting the keratinocyte loaded asiaticoside vesicles with a buffer solution, then adding calcium carbonate powder, then adding atriplex obscura leaf powder, uniformly mixing, and then shaping with a mold to obtain the Chinese herbal medicine hydrogel. According to the Chinese herbal medicine hydrogel, the asiaticoside is combined with the keratinocyte bionic nano-vesicles, so that the medicine can be promoted to better reach the interior of skin cells, and the Chinese herbal medicine hydrogel is particularly suitable for treating burn wounds, diabetic wounds and other wounds difficult to heal.

The invention discloses a high-transparency, low-temperature processable cellulose acetate film and its preparation method. The high-transparency cellulose acetate film comprises, by weight percentage, the following raw materials: 75-85 parts of modified cellulose acetate, 12-20 parts of plasticizer, 2-6 parts of transparency agent, where the plasticizer and transparency agent are both composite additives. The preparation process involves uniformly blending all raw materials, followed by uniform mixing and drying, extrusion, granulation, drying, and casting, to obtain a high-transparency cellulose acetate film. The cellulose acetate film prepared by the above method utilizes the synergistic effect of the specific plasticizer and transparency agent, which not only significantly reduces the processing temperature but also results in a film with high light transmittance and low haze. The film exhibits good extensibility and flexibility, excellent antibacterial properties, and the process is simple, time-saving, and efficient, making it suitable for large-scale industrial production.

This application provides a housing for an electronic device and a method for manufacturing the same, relating to the field of electronic product technology. The housing has a cellulose acetate membrane and a protective layer sequentially disposed on the inner surface of a substrate. The cellulose acetate membrane imparts a unique texture and gloss to the housing. By using a polycarbonate layer, a polymethyl methacrylate layer, or a composite board made of polycarbonate and polymethyl methacrylate as the substrate and protective layer, and by making both the substrate and protective layer from plastic, the manufacturing cost of the housing can be reduced, thereby saving on the overall production cost of the electronic device. Furthermore, by sandwiching the cellulose acetate membrane between the substrate and the protective layer, the cellulose acetate membrane can be protected from both sides, and the gaps on both sides of the cellulose acetate membrane can be reduced, enhancing the density of the housing. This, in turn, improves the waterproof performance of the housing and enhances the reliability of both the housing and the overall electronic device.

This invention provides a method, replica film, and application for directly detecting silicon nitride grain boundary phases. The method includes the following steps: S1, etching a polished silicon nitride ceramic sample with hydrofluoric acid solution; S2, replicating the etched polished surface with a first solvent and a cellulose acetate film to obtain a primary replica; S3, vacuum-depositing a carbon film onto the primary replica to obtain a secondary replica; S4, cutting and attaching the secondary replica film to low-temperature paraffin wax, then dissolving the cellulose acetate in a second solvent; S5, transferring the dissolved secondary replica film to a third solvent, and after the secondary replica film has fully expanded, retrieving it with a copper mesh, drying it, and observing it under an electron microscope. The method provided by this invention can separate the grain boundary phase from the silicon nitride main phase, obtaining the solid grain boundary phase while retaining the morphological outline of the silicon nitride main phase. This method is simple to operate, low in cost, and provides great convenience for studying the influence of grain boundary phases on the mechanical and optical properties of silicon nitride separately.

The invention discloses a method for detecting thrombin activity in a biological product by using a functionalized electrode, and belongs to the technical field of electrochemical detection. Firstly, thrombin specific substrate polypeptide is fixed on the surface of a silk-screen printing gold electrode through an Au-S bond, and the N end of the polypeptide is modified with ferrocene (Fc) to serve as an electroactive signal molecule; then the surface of the electrode is coated with a cellulose acetate membrane (CA) to obtain a functionalized electrode, and the CA membrane can reduce non-specific adsorption and prevent electrode pollution and signal attenuation; dropwise adding a solution containing thrombin onto the functionalized electrode for reaction; and washing the reacted electrode, testing by using a square wave voltammetry, and obtaining the thrombin activity according to the change of the peak current. The method is convenient to operate, high in specificity, short in consumed time and long in storage time of the functionalized electrode, and is an effective means for detecting the thrombin activity in the biological product.

The invention discloses a photo-thermal evaporation water purification fabric based on cellulose acetate hollow fibers and a preparation method, and relates to the field of photo-thermal materials and solar interface evaporation. A carbon black-loaded cellulose acetate membrane is prepared from a mixed solution of cellulose acetate and carbon black and deionized water, the cellulose acetate membrane is deacetylated in an ethanol / water mixed solution of NaOH, then the surface of the cellulose acetate membrane is uniformly coated with ZIF-8 particles, composite hollow fibers are obtained, the composite hollow fibers are used as weft yarns, the carbon black-loaded cellulose acetate membrane is used as warp yarns, and the ZIF-8 particles are uniformly coated on the surface of the composite hollow fibers. The photothermal evaporation water purification fabric with a uniform structure is formed by carrying out plain weaving in a staggered manner according to the quantity ratio of 1: 1, can realize regulation and control of a solar water evaporation interface, integrates functions of photothermal conversion, water vapor regulation and control and pollutant separation, and can be widely applied to solar water purification scenes such as seawater desalination, organic wastewater treatment and environmental restoration.

Increasing concerns about cytotoxicity caused by traditional ophthalmic product preservatives have driven demand for preservative-free solutions while challenging manufacturers to maintain sterility and safety standards. Inherent user risks have been combined with random manufacturing contamination, resulting in devastating product recalls in recent years. The present invention is a bioactive, affinity filtration system for medical dispensing devices engineered to remove preservatives and contaminants from ophthalmic and other medical solutions when administered. This “just in time” filtration enables manufacturers to follow established preservative practices to ensure safety while delivering a “preservative free” solution upon administration. Without altering the therapeutic formulation, the invention combines adsorption and absorption filtration mechanisms with engineered fullerene derivatives and cellulose acetate membranes to remove preservatives like benzalkonium chloride, thimerosal, and stabilized oxychloro complexes. The invention is designed for integration into established manufacturing, packaging, and stability quality control protocols consistent with the most rigorous antimicrobial patient safety standards.

The application discloses a friction nanogenerator and a preparation method and application thereof. The composition of the friction nanogenerator comprises a first friction unit, a second friction unit and a flexible support framework, the composition of the first friction unit comprises a first electrode layer and a first friction layer which are laminated and attached, the composition of the second friction unit comprises a second electrode layer and a second friction layer which are laminated and attached, the first electrode layer and the second electrode layer are both fixed on the flexible support framework, the first friction layer and the second friction layer are arranged face to face and do not directly contact each other, the first friction layer is a porous cellulose acetate film, and the second friction layer is a polyvinylidene fluoride film. The friction nanogenerator has the advantages of light mass, good flexibility, high stability and the like, and the preparation method is simple, the production cost is low, the equipment requirement is low, and the friction nanogenerator is suitable for large-scale production and application.

This invention discloses a fluorescent probe molecule, a fluorescent cellulose nanoparticle membrane, and their applications. The fluorescent probe molecule uses methylene blue as the fluorophore and allyl groups as the recognition sites. The fluorescent cellulose nanoparticle membrane is prepared by uniformly mixing the fluorescent probe molecule with cellulose diacetate to form a spinning solution, and then using electrospinning technology to obtain a flexible fluorescent sensing film. The resulting flexible fluorescent sensing film is a fluorescent cellulose nanoparticle membrane for carbon monoxide detection. The prepared fluorescent probe molecule has advantages such as simple operation, low cost, high selectivity, rapid response, and real-time monitoring, making it suitable for detecting carbon monoxide in the ecological environment. The combination of the cellulose diacetate membrane and the fluorescent probe molecule not only improves the detection performance and application range but also reduces costs and environmental impact, demonstrating broad application prospects.

The invention provides a multifunctional non-woven material filter stick, a preparation method thereof and a cigarette product. The multifunctional non-woven material filter stick comprises a non-woven fabric and a base material which are stacked and wound, the non-woven fabric is made of one or more of lyocell fibers, modal fibers, polylactic acid fibers, viscose fibers, hemp fibers and wood pulp fibers; the base material comprises a membrane material, and the membrane material comprises one or more of a polylactic acid membrane, a polyvinyl chloride membrane, a polyethylene membrane, a polypropylene membrane, a polyethylene glycol terephthalate membrane, a polyadipic acid / butylene terephthalate membrane, a cellulose acetate membrane, a water-based coating membrane and a metallized membrane. The filter stick is prepared from the non-woven fabric made of the specific material and the base material made of the specific material, the non-woven fabric has a good tar reducing and harm reducing effect, and the content of harmful substances such as nicotine and tar in smoke can be obviously reduced; the base material can improve the roundness, hardness and the like of the filter stick, so that the filter stick has good supporting performance.

The application relates to the technical field of biological medicine, in particular to a bacterial endotoxin removing device. The removing column comprises a column body and a shaking mechanism; the inside of the column body is provided with a cavity, a plurality of activated carbon particles wrapped with cellulose acetate membranes are filled in the cavity, the two ends of the column body are respectively provided with openings, and a plurality of 0.22-micron microporous filter membranes are arranged at the ends of the column body at intervals; the shaking mechanism clamps and fixes the column body and is used for shaking the column body, so that the solution entering the inside of the column body fully contacts the activated carbon particles. The removing column can remove bacterial endotoxins in various product solutions, does not use stimulating solvents, does not damage the components in the product solutions, is simple to operate, is widely applicable, and is high in practicality.

This invention discloses a modified nanofiber membrane with both heavy metal adsorption and oil-water separation properties, its preparation method, and its applications. Belonging to the field of functional nanofiber materials technology, the invention includes the following steps: dissolving cellulose acetate and polyvinylpyrrolidone in a mixed solvent to obtain a spinning solution; obtaining a cellulose acetate membrane using electrospinning; and subjecting the cellulose acetate membrane to deacetylation treatment and chitosan loading to obtain the modified nanofiber membrane with both heavy metal adsorption and oil-water separation properties. The monolayer chitosan-loaded modified cellulose acetate membrane prepared by this invention possesses both heavy metal adsorption and oil-water separation properties, offering better adaptability and multifunctional applications for complex water treatment environments in actual production. Furthermore, the synthesis process is simpler and more efficient, the raw materials are widely available, inexpensive, and biodegradable. While ensuring certain mechanical and adsorption properties, it also has the potential for large-scale production, aligning with the concept of sustainable green development.

The invention discloses an application method of a cellulose acetate membrane in an OMD decoration process, and belongs to the technical field of an out-of-mold decoration process. The application method of the cellulose acetate diaphragm applied to the OMD decoration process comprises the following steps: step 1, carrying out prime coat treatment on a binding surface of the cellulose acetate diaphragm to form a prime coat layer; 2, coating thermal reactive PU glue on the surface of one side of the PC film, and baking to form a glue layer; step 3, performing hot-pressing compounding on the cellulose acetate membrane with the prime coat and a PC (Polycarbonate) membrane through thermal reactive PU (Poly Urethane) glue to obtain a composite membrane; 4, the composite membrane is integrally transferred and attached to the surface of an ABS / PC injection molding part through a vacuum pressure difference membrane covering technology, and OMD out-of-mold decoration is completed. The application effect of the cellulose acetate membrane in the OMD decoration technology can be effectively improved, and the high practical value is achieved.

The invention provides a construction method of a cellulose acetate nanofiltration membrane with anti-pollution and high separation performance, and the cellulose acetate nanofiltration membrane is prepared by taking tannic acid as a modification auxiliary agent and combining layer-by-layer self-assembly and interfacial polymerization technologies. The tannic acid has catechol and galloyl, and an adhesive layer formed after oxidation auto-polymerization can be adhered to the surfaces of various substrates. Chitosan and tannic acid are deposited on the surface of a membrane by utilizing a layer-by-layer self-assembly technology to construct an adhesive layer, and the adhesive layer and amino groups of a polyamide layer obtained by reacting PEPA and TMC are subjected to Michael addition and Schiff alkali reaction, so that the binding force between the polyamide layer and a substrate layer is enhanced, and a separation layer with a stable structure is constructed. The technology is simple to operate, effectively solves the problems that the cellulose acetate membrane is unstable in structure and easy to pollute, and is not applied to the cellulose acetate membrane.

The invention discloses lipid vesicles co-loading salvia miltiorrhiza-radix puerariae effective components, a preparation method and application, and the preparation method comprises the following steps: placing egg yolk lecithin, sodium deoxycholate, radix puerariae isoflavone, tanshinone and salvianolic acid in a round-bottom flask according to a weight ratio of 50: (22-27): 10: (0.3-0.9): 7, then adding methanol for fully dissolving, carrying out rotary evaporation under the conditions of 40 DEG C and 50 rpm / min, filtering, washing, and drying to obtain the lipid vesicles. Removing methanol to obtain a film; performing vacuum drying overnight at room temperature to obtain a dry and transparent film framework; adding ultrapure water into the membrane skeleton, and carrying out hydration treatment to obtain a liposome solution; and filtering the liposome solution with a 0.22 [mu] m cellulose acetate membrane to obtain the liposome. Through multi-component synergistic encapsulation, strong hydrophobic tanshinone is encapsulated in a phospholipid bilayer, weak hydrophobic pueraria isoflavone is distributed on a phospholipid layer or interface, and hydrophilic salvianolic acid is contained in a water phase or interface, so that the stability of a lipid vesicle system is enhanced, and the problem of low bioavailability of a preparation is solved.

The present application relates to the technical field of electronic products. Provided are a shell of an electronic device, a manufacturing method for the shell, and an electronic device. In the shell, a cellulose acetate membrane and a protective layer are sequentially provided on the inner surface of a substrate, wherein the cellulose acetate membrane can endow the shell with unique textures and luster. By setting the substrate and the protective layer to be a polycarbonate layer, a polymethyl methacrylate layer or a composite board formed by compositing polycarbonate and polymethyl methacrylate, the substrate and the protective layer are both made of plastics, such that the manufacturing cost of the shell can be reduced, thereby saving on the production cost of the whole electronic device. In addition, by sandwiching the cellulose acetate membrane between the matrix and the protective layer, the cellulose acetate membrane can be protected from both sides, and gaps in both sides of the cellulose acetate membrane can be reduced, thereby enhancing the compactness of the shell. Furthermore, the waterproof performance of the shell is improved, and the reliability of the shell and the whole electronic device is improved.

The invention discloses a preparation method of an oxidized tannic acid cross-linked enzyme-loaded membrane material and application of the oxidized tannic acid cross-linked enzyme-loaded membrane material in membrane pollution prevention and control. The invention develops a method for immobilizing a quorum sensing quenching enzyme (AiiA enzyme) based on an oxidized tannic acid modified cellulose acetate membrane. Compared with natural tannic acid, oxidized tannic acid has richer reaction active sites on modification sites due to introduction of quinonyl, can be combined with target substances more accurately and efficiently, and has more advantages in reaction selectivity and modification efficiency. According to the method, oxidized tannic acid is used as a green cross-linking agent to replace toxic glutaraldehyde, and AiiA enzyme is immobilized on the surface of the membrane through mild reaction, so that high enzyme activity is reserved, and a synergistic effect is generated by virtue of antibacterial activity of tannic acid and quorum sensing quenching function of enzyme, so that the membrane flux attenuation rate in 24-hour simulated filtration is reduced by 40-50%, and the membrane flux attenuation rate is reduced by 30-50%. And the technology is low in cost, simple to operate and suitable for large-scale production, and a sustainable solution is provided for MBR biological pollution resistance.

The invention relates to the technical field of polarizers, and discloses a pretreatment method of dichroic dye, a dye-based polarizer and a preparation method of the dichroic dye, and the pretreatment method comprises the following steps: filtering the dichroic dye through a mesh screen, mixing and stirring the dichroic dye with pure water, adding a boric acid solution to adjust the pH value to weak acidity, separating out the dye and dissolving impurities in water, and drying to obtain the dichroic dye. And filtering with filter cloth, and carrying out forced air drying to obtain a purified dichroism dye finished product. The method takes water as a medium in the whole process, does not need an organic solvent and is green and environment-friendly. When the purified dichroism dye finished product is used for preparing the polaroid, swelling, dip dyeing, stretching in a boric acid solution and drying are carried out on a PVA film to prepare a polaroid, then the polaroid is compounded with an anti-ultraviolet cellulose triacetate film, and gluing is carried out, so that the prepared dye system polaroid has high degree of polarization, high transmittance and excellent weather resistance; the optical performance change rate is less than or equal to 5% after dry heat and damp heat tests, no depolarization phenomenon exists, and the strict application requirements of high-end vehicle-mounted display and the like are perfectly met.

The embodiment of the invention discloses a preparation method of a cellulose acetate membrane and the membrane, and the method comprises the following steps: mixing and kneading: preparing material powder, and kneading the material powder to form kneading blocks; stir-frying: stir-frying the kneading blocks to form a stir-fried plate; a plurality of stir-frying plates are stacked in a stacked mode and extruded to form material blocks; extruding and pelletizing: extruding the ornament material block and cutting into colloidal particles; mixing colloidal particles: mixing the colloidal particles into a solvent to form colloidal particles to be pressed; pressing: pressing the rubber particles to be pressed into a rubber plate; flaking: the rubber plate is flaked into slices by using a metal cutting technology, and the thickness of the slices is less than 0.3 mm; and hot stretching: the thin sheet is subjected to hot stretching to form a membrane, and the thickness of the membrane is smaller than that of the thin sheet. The problem that an existing cellulose acetate film is thick and cannot be widely applied to other industries can be solved.