237 results about "Cellulose acetate membrane" patented technology

The invention provides a drug residue competition-type quantum dot-labeled immunochromatography assay test-strip/detection card and an observation device thereof, comprising the following preparation steps of coating the antibody of quantum dot-labeled drug molecule on a fiberglass film, coating the drug-molecular-carrier protein coupler and second antibody on a pyroxylin film or a cellulose acetate film respectively to form a detection belt and a quality control belt; preparing the immunochromatography assay test-strip from the fiberglass film and the pyroxylin film or the cellulose acetate film on a polyester or plastic plate, and assembling a shell. The quantum dots of the detection belt and the quality control belt on the test-strip is triggered by the ultraviolet LED source of the observation device, and the change of the fluorescent intensity of the observation belt and the quality control belt is observed, thus being capable of quantitatively analyzing the content of the drug molecule in the sample. The invention has simple operation, high sensitiveness and quick quantification, is suitable for detecting the drug residue in the food and can be widely applied to the customhouse, airport, health supervising department, household and the like.

The invention discloses a preparation method of an anticoagulation polylactic acid hemodialysis membrane. Cellulose acetate membranes and polysulfone membranes are widely used in current clinical application. Poly lactic acid has a good membrane-forming property, but is inclined to hydrophobicity, and blood contacting materials are often required to have good hydrophilicity, can reduce the protein adsorption on material surfaces and reduce platelet aggregation. In the preparation method, firstly a polylactic acid hollow fiber membrane with epoxy groups is prepared by a one-step method, then diamine activation of the polylactic acid hollow fiber membrane is carried out, finally heparin is introduced into the activated polylactic acid hollow fiber membrane to obtain the anticoagulation polylactic acid hemodialysis membrane. In the preparation method, the polylactic acid is used as a dialysis membrane material, and the novel dialysis membrane is prepared through use of the wet/dry solution spinning method; and through in-situ polymerization of monomers having double bonds and the epoxy groups, groups of high reaction activity are introduced into a polylactic acid matrix, and reaction conditions of subsequent diamine grafting process and heparin fixing process are mild, so the method is a simple and convenient modification method.

The invention discloses test paper for rapidly detecting the immunochromatography of cadmium ion colloidal gold and a preparation method and application thereof. The test paper consists of a sample pad, a colloidal gold combination pad, a nitrocellulose membrane, absorbent paper and a plastic base plate; The sample pad, the colloidal gold combination pad, the nitrocellulose membrane and the absorbent paper are sequentially stuck on the plastic base plate; an anti-cadmium ion monoclonal colloidal gold label is coated on the colloidal gold combination pad; a goat anti-rat IgG antibody and a complete antigen Cd-iEDTA-BSA of heavy metal cadmium are sequentially coated on the nitrocellulose membrane; the goat anti-rat IgG antibody is used as a quality control line; and the complete antigen Cd-iEDTA-BSA of the heavy metal cadmium is used as a test line. The test paper detects residual metal cadmium in ambient soil, a water body and an aquatic product based on the immunology theory of antigen antibody; and compared with the prior detection system, the test paper has the advantages of rapidness, cheapness, convenience, sensitivity and speciality, can give a result within five minutes and is convenient to carry along to carry out field monitoring.

The invention relates to a fluorizated cellulose acetate film and a preparation method. The fluorizated cellulose acetate film is prepared by taking cerium salt as an initiator and grafting hydrophobic and oleophobic fluoroester methacrylic acid (FMA, such as methacrylic acid-12-fluorine heptyl ester G04, methacrylic acid hexafluoro-butyl ester G02 and the like) and hydrophilic polyglycol ester methacrylic acid (PEGMA) or methacrylic acid MAA and sulfanilamide MPDSAH sequentially onto cellulose acetate by a water-phase free-radical interfacial polymerization method; and then, taking the synthesized fluorizated cellulose acetate as a film material and preparing an asymmetrical oil-water separation film with pollution resistance and ultra-low flux depression by a non-solvent initiating phase conversion method. When the fluorizated cellulose acetate film is used for processing oil-water emulsion, the detention rate is as high as 99.8%, the rate of flux depression can be lowered to 3.4%, the water flux can be kept at 247.1L/m2h, and the rate of flux recovery is as high as 100%. The fluorizated cellulose acetate oil-water separation film has superior anti-pollution performance and strong recycle property.

The invention relates to a preparation method for a cigarette filter tip adopting an electrostatically spun cellulose acetate membrane, and the method includes the following steps: (1) cellulose diacetate is dissolved in the mixture of acetone and dimethylacetylamide, electrostatic spinning is carried out, and thereby the nano cellulose acetate membrane is obtained; (2) cellulose acetate tows in a cigarette are pulled out, the nano cellulose acetate membrane is laid between the filter tip and the cigarette along the cross-sectional direction of the filter tip, the cellulose acetate tows which are originally pulled out are then put into the cigarette, the part of the filter tip, which exceeds connecting paper, is cut off, and thereby the improved cigarette filter tip is fabricated. The preparation method uses the electrostatic spinning technology to fabricate the nano cellulose acetate membrane and adds the nano cellulose acetate membrane into the cigarette filter tip, the nano cellulose acetate membrane not only can be perfectly combined with the cigarette filter tip, but also can enhance the harmful gas-filtering performance of the cigarette filter tip, meanwhile, the preparation method is easy to operate, the efficiency is relatively high, and the cigarette filter tip can remarkably reduce the contents of various harmful components, and has a good market prospect.

The invention provides a reusable three-dimensional (3D) polarized glass polarizer and glasses using the same. The polarizer comprises a protective film, a scratch resistant cellulose triacetate (TAC) film, a retardation film, a scratch resistant polarizing film and a protective film in turn. An absorption axis of the scratch resistant polarizing film and a slow axis of the retardation film form an angle between 40 and 50 degrees or an angle between 130 and 140 degrees. The reusable three-dimensional (3D) polarized glass polarizer can effectively be prevented from scratching, and the hardness effect of the scratch resistance can reach more than 2H to prolong the service life of a product.

The invention discloses a cellulose acetate commixed nano-filtration membrane and a preparation method thereof. The cellulose acetate commixed nano-filtration membrane is prepared by taking cellulose acetate as a base material phase and a macromolecular hydrophilic substance as a dispersed phase, adding a micro-molecular pore-forming agent, dissolving with a solvent to prepare a cellulose acetate membrane casting solution, coating the prepared membrane casting solution on a dry and clean glass plate with a supporting layer to form a flat-plate nascent-state membrane or extruding the prepared membrane casting solution and media for forming inner cavities of fibers through a spinneret plate to form a hollow fiber nascent-state membrane, and condensing and carrying out heat treatment on the hollow fiber nascent-state membrane. The macromolecular hydrophilic substance has good acid resistance, alkali resistance and biocompatibility and is added into a cellulose acetate membrane casting solution system to prepare the membrane, so that the water penetration amount and porosity of the membrane can be improved, and the flexibility, flatness and chemical reagent resisting stability of the membrane also can be improved; and compared with a single cellulose acetate nano-filtration membrane, the commixed nano-filtration membrane has relatively wide feasibility and relatively strong practicability.

The invention provides a preparation method of a cellulose acetate membrane surface crosslinked chitosan hydrophilic membrane and belongs to the technical field of membrane surface modification. A cellulose acetate membrane is activated by an acid solution, and has coupling crosslinking with the acetic acid water solution of the chitosan, so that a hydrophilic membrane material of the cellulose acetate membrane surface crosslinked chitosan can be prepared. The preparation method of the invention is simple in technology, low in cost, natural, and environmentally-friendly. The cellulose acetate membrane modified by the method is good in hydrophillic nature and binding capability, is good in mechanical strength and mechanical toughness, can be widely applicable to the field of biochemistry, molecular biology and environment, such as the immunoassay, the protein and DNA (deoxyribonucleic acid) analysis, the colloidal gold detection card, the absorption and removal of the toxic and harmful substances in the environment such as the environmental hormone and the like, and can be taken as biomedical material due to the improvement of the mold resistance of a cellulose acetate membrane.

A process for preparing biological ester/cellulose acetate composite membrane for sampling the toxic organic pollutants in environment monitor and removing them from water includes such steps as dissolving the cellulose acetate in solvent, adding biological ester, and preparing membrane by the L-S phase transfer method. The membrane contains cellulose acetate, dioxane, acetone, magnesium perchlorate, and neutral ester in a certain proportion.

A method of film fabrication is taught that uses a coating and drying apparatus to fabricate resin films suitable for optical applications. In particular, cellulose acetate films are prepared by simultaneous application of multiple liquid layers to a moving carrier substrate. After solvent removal, the cellulose acetate films are peeled from the sacrificial carrier substrate. Cellulose acetate films prepared by the current invention exhibit good dimensional stability and low birefringence.

The invention discloses a MoO<3-x>/g-C<3>N<4> composite photocatalytic material. The composite photocatalytic material is composed of a hydrophobically modified cellulose acetate membrane and a MoO<3-x>/g-C<3>N<4> compound supported on the cellulose acetate membrane, wherein the MoO<3-x>/g-C<3>N<4> compound is formed by connecting MoO<3-x> with g-C<3>N<4> via a Z-type heterojunction. The inventionalso discloses a preparation method for the above MoO<3-x>/g-C<3>N<4> composite photocatalytic material and the application of the composite photocatalytic material to degrading of VOCs in water bodies. The MoO<3-x>/g-C<3>N<4> composite photocatalytic material of the invention has high photothermal conversion efficiency and high quantum efficiency, and can improve the vaporization speed of waterand realize high-efficiency degradation of VOCs; and high-quality and high-efficiency production of clean water is successfully achieved through the synergistic effect of vaporization and degradation.

The invention discloses a preparation method of a high-throughput graphene oxide-cellulose acetate composite membrane which is prepared with an immersion precipitation phase inversion process. A casting membrane solution comprises components in mass of the casting membrane solution respectively of 15%-30% of cellulose acetate, 0.0001%-0.01% of graphene oxide, 10%-35% of formamide and 35%-70% of acetone. Single layer graphene oxide has the advantages of large specific surface area and high absorbability, the micro-structure of the membrane can be finely adjusted, and the membrane performance is improved. The prepared high-throughput graphene oxide-cellulose acetate composite membrane has a great application value and potential. Experiments prove that compared with a pure cellulose acetate membrane, the throughput of the high-throughput graphene oxide-cellulose acetate composite membrane is improved by 220%, the operating pressure can be reduced greatly, energy consumption is saved, and the high-throughput graphene oxide-cellulose acetate composite membrane has a better application in the fields of heavy-metal ion removal, industrial waste water treatment and seawater desalination and the like.

The invention provides a test strip for screening specific dust mite allergen IgE. The test strip is coated with dust mite allergen labeled by colloidal gold. The colloidal gold labeling technique is utilized, the colloidal gold is used for labeling the specific dust mite allergen for the first time, then the labeled allergen is uniformly sprayed on a cellulose acetate membrane or a nitrocellulose membrane in a line manner, and the prepared test strip is used for allergen detection, the operation is simple and convenient, the result is accurate, the cost is low and other free detection can be realized.

The invention discloses a preparation method of a homogeneous enhanced cellulose acetate hollow fiber membrane, and the preparation method comprises the following process steps: 1, preparation of a hollow braided tube reinforced body, to be more specific, using a 2D woven technology to prepare a cellulose acetate filament into a hollow braided tube with the diameter of 1-2mm, and using the hollow braided tube as the reinforced body; 2, preparation of a cellulose acetate membrane casting solution comprising 4-18% by mass of cellulose acetate, 2-20% by mass of a pore forming agent, 0-4% by mass of a non solvent and 58-94% by mass of a solvent; 3, preparation of the hollow fiber membrane, to be more specific, homogeneously coating the surface of the hollow braided tube with the membrane casting solution by use of a co-extrusion spinneret, then using a silk guide roller for leading to pass through the air gap of 2-20cm to immerse into a solidification bath at 10-50 DEG C for forming to obtain the hollow fiber membrane; the hollow fiber membrane has good mechanical properties and interfacial bonding state, is easy to process after being abandoned, and has the advantages of simple preparation method.

The invention discloses a composite nuclear track membrane and a preparation method thereof. The composite nuclear track membrane comprises a polyester nuclear track membrane or a polycarbonate nuclear track membrane, wherein a porous cellulose acetate membrane is composited on one surface of the polyester nuclear track membrane or the polycarbonate nuclear track membrane so as to form the composite nuclear track membrane of which the thickness is 67-160 microns, the aperture of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 1-10 microns, the pore density of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 2*10<5>/cm<2>-2*10<7>/cm<2>, and the thickness of the polyester nuclear track membrane or the polycarbonate nuclear track membrane is 7-25 microns. The composite nuclear track membrane has the advantage that the surface hydrophilicity is good, the mechanical strength is high, the membrane thickness is moderate, the automatic operation can be realized easily, the flux of the filtering liquid is high, and the assimilative capacity is strong; the composite membrane is an integer, is not layered and is suitable for fabricating roll type filter cores; the porous cellulose acetate membrane composited on the nuclear track membrane is taken as a pre-filtering layer or a support layer of the nuclear track membrane, so that the problems about mechanical strength and thickness of the membrane are solved, and meanwhile, the a pre-filtering problem of the membrane is solved.

The invention discloses a modified cellulose acetate film as well as a preparation method and application thereof. The preparation method of the modified cellulose acetate film comprises the following steps of (1) mixing and dissolving cellulose acetate materials, organic solvents, modified materials, crosslinking agents, catalysts and pore forming agents; defoaming the mixed solution to obtain film casting liquid; (2) scraping the film casting liquid onto a substrate material to form a bottom film layer; then culturing the bottom film layer; (3) putting the cultured bottom film layer into a gel bath for conversion so that the gel becomes a primary film; then, removing solvents from the primary film; performing heat treatment to obtain a modified cellulose acetate base film; (4) modifying the modified cellulose acetate base film in modification liquid to obtain the modified cellulose acetate film. The modified cellulose acetate film has the anti-corrosion performance and low cost; meanwhile, the film material is applied to farmland irrigation waste water recovery and utilization; the fast irrigation water circulation utilization of salinization land pieces is realized; the environment-benefits are good.

The invention relates to a treatment method for heavy-metal-containing wastewater. The treatment method comprises the following steps: 1) adding a heavy metal adsorbent into the heavy-metal-containing wastewater, and fully stirring or shaking for 2-5 hours; carrying out centrifugal separation on the heavy metal adsorbent, or standing, so that supernatant is obtained after the heavy metal adsorbent is precipitated; 2) adding a complexing agent into the supernatant obtained in the step 1), and fully stirring or shaking for 1-3 hours; adding a reducing agent, and fully stirring or shaking for 1-3 hours; regulating the pH value to be 8-12 with an alkaline solution, heating to 60-80 DEG C, fully reacting for 2-3 hours, and carrying out solid-liquid separation; 3) enabling the liquid obtained in the step 2) to pass through activated CD-180 macroporous adsorption resin, enabling effluent liquid to pass through D61 macroporous cation exchange resin, and collecting effluent liquid; and 4) enabling the effluent liquid obtained in the step 3) to pass through a reverse osmosis cellulose acetate membrane at the pressure of 0.5-2MPa, so that the heavy-metal-containing wastewater is treated. The treatment method has the advantages that the content of target heavy metals in wastewater can be obviously reduced, and removal rates reach more than 90% respectively; and meanwhile, the technology is simple, and the operation is convenient, so that the method has good application prospects.

The invention discloses detection test paper for detecting benzoyl peroxide in flour and preparation method of the detection test paper. The test paper comprises a test strip and a standard colourimetric card, wherein the standard colourimetric card comprises 10 color lumps with corresponding concentration gradients of benzoyl peroxide from shallow to deep respectively 0mg/L, 12 mg/L, 36 mg/L, 60mg/L, 84 mg/L, 108 mg/L, 132 mg/L, 156 mg/L, 180 mg/L and 228 mg/L. The test strip comprises a substrate and a color-developing layer adhered on the front end of the substrate, the color-developing layer has a test function, the substrate is made of a PVC (polyvinyl chloride) sheet, and the color-developing layer is prepared by immersing a cellulose acetate film in a color-developing mixed solution consisting of 5-10 percent of potassium iodide, 0.2-0.8 percent of soluble starch and 2-8 percent of sodium carbonate and then drying in vacuum at a temperature of 40-80 DEG C for 20-50min. According to the comparison of the color-developing degree of a sample to be detected and the standard colourimetric card, the content range of the benzoyl peroxide can be rapidly judged. The detection test paper disclosed by the invention is simple, rapid and visual in operation when being used for detecting the benzoyl peroxide remained in the flour, and has high detection sensitivity and accuracy.

The invention relates to a polyvinylidene fluoride ultrafiltration membrane modification method for improving anti-pollution performance of the film. Cellulose acetate as a membrane material is added with hydrophilic nanoparticles to the change membrane hydrophilicity, so as to complete blending modification of the cellulose acetate membrane. The method of the invention has simple operations, effectively improves the interface bonding with matrix to better transfer the stress to inorganic particles, increases permeability of the composite membrane, improves the flexibility and the service life of the membrane, reduces costs, and maintains interception performance of the ultrafiltration membrane. The prepared ultrafiltration membrane has obviously improved hydrophilicity and significantly improved anti-pollution ability.

The invention discloses insulation particles of a three-dimensional electrode reactor and preparation and application method thereof. The insulation particles are prepared by polyimide membrane coated particle electrodes with the same materials and the same shapes; and the insulation particles and the particle electrodes are uniformly mixed by mass or volume ratio of 25-35% to 65-75% as bed fillers of the three-dimensional electrode reactor for degrading organic waste water. The insulation particles prepared by the invention are resistant to acid and alkali, wear-resistant, good in insulation effect, long in service life, strong in adaptability and wide in range of application, and can solve the problem of delamination and insulation failure of the particle electrodes and quartz sands, glass balls, plastics and the like, overcome the defects that the acetyl cellulose membrane is low in strength, non-resistant to wear and corrode and easy to dissolve and drop, increase repolarization rate of the particle electrodes in the bed fillers, reduce short circuit current, improve current efficiency, lower electric consumption, and enhance degrading efficiency and treatment effect of the three-dimensional electrode reactor on the organic waste water.

The invention provides a preparation and application method of filter paper collecting a biological sample. An absorbing material with high accuracy, high stability and good repeatability is prepared by adding a specific stabilizer to the filter paper so that the sample is convenient to convey and store at normal temperature and easy to elute after drying, and the storage time of the biological sample is prolonged. According to the invention, a high-performance cellulose acetate film and a cellulose nitrate film are used as the filter paper materials; the filter paper material is completely soaked in 3.8 mM or 7.7 mM of aqueous solution of ethylene diamine tetraacetic acid; the completely soaked filter paper material is taken out and dried at 45 DEG C; and the finished product is taken out and stored in a sealed manner. The method provided by the invention is convenient for the detection process, and can lower the clinical examination cost and reduce economical burden on patients.