277 results about "Dodecyl sulfate" patented technology

The invention discloses a core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule, the microstructure is of a spherical structure, the core-shell structure is adopted, the core structure is hexadecane, the shell structure is a methyl methacrylate (MMA) and N, N-methylene bisacrylamide (MBA) copolymer, the emulsifier is lauryl sodium sulfate (SDS), the initiator is potassium persulfate, and the pH value of the core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule is 7-8. And the coating efficiency is 70-75%. The preparation method comprises the following steps: 1, preparing an oil phase and a water phase; and 2, polymerization reaction of the microcapsule. A phase change cement material based on a core-shell structure P (MMA-MBA) copolymer heat storage phase change microcapsule is prepared by compounding the P (MMA-MBA) copolymer heat storage phase change microcapsule and a cement matrix, and has hydrophobicity; obvious weightlessness exists in two times.

The invention relates to the field of separation and purification, in particular to an anti-pollution nanofiltration membrane for magnesium-lithium separation, the anti-pollution nanofiltration membrane comprises a base membrane and a functional layer, and the functional layer is prepared from the following raw materials in parts by weight: a water phase: 1.5-2.5 parts of piperazine, 0.1-1 part of lauryl sodium sulfate, 0.5-2 parts of glycerol, 1-2 parts of triethylamine, 0.6-2 parts of ionic polymer, and the balance of water for supplementing the total amount of the water phase to 100 parts; the ionic polymer comprises at least one of sulfobetaine metacrylic acid ester, sulfobetaine and carboxyl betaine metacrylic acid ester; and an oil phase: 0.1-1 part of trimesoyl chloride, and the total amount of the oil phase is supplemented to 100 parts by normal hexane or isoparaffin. The ionic polymer is added, and a compact hydration layer is formed on the surface of the membrane by using a betaine group of the ionic polymer, so that the membrane pollution probability is reduced, and common inorganic scaling and organic pollution in the high-salt brine are remarkably inhibited; in addition, the ionic polymer enables the membrane surface to have strong negative electricity, and the magnesium ion rejection rate is improved; and the ionic polymer can also reduce the lithium ion transmission energy barrier and reduce the rejection rate.

The application belongs to the technical field of self-repairing materials, and particularly relates to a kind of double-microcapsule self-repairing water-based polyurethane material and its preparation method. It comprises: ultrasonic dispersion of cellulose nanocrystals in deionized water to form an aqueous phase, adding dry oil and sodium dodecyl sulfate, and stirring to obtain a dry oil microcapsule with a Pickering emulsion as a template. Then, polyvinylpyrrolidone aqueous solution, non-polar solvent solution of thiophene monomer and ammonium persulfate aqueous solution are prepared. The first two are mixed and ultrasonically dispersed, then mixed with the ammonium persulfate aqueous solution and stirred to polymerize. After the reaction is completed, polythiophene microcapsule suspension is obtained. After centrifugation, the supernatant is colorless. The solid is washed and dried to obtain polythiophene microcapsules. Finally, the two kinds of microcapsules are added to the water-based polyurethane, mixed uniformly, dried at room temperature to form a double-microcapsule self-repairing water-based polyurethane material. The application realizes the self-repairing and mechanical property improvement of the double-microcapsule self-repairing water-based polyurethane material under room temperature natural light.

This invention relates to the field of wastewater treatment technology, specifically to a highly efficient adsorbent wastewater treatment agent and its preparation method, comprising the following raw materials in parts by weight: 50-70 parts activated carbon powder, 8-12 parts deionized water, 5-10 parts ammonium bicarbonate, 1-3 parts sodium dodecyl sulfate, 15-25 parts additive A, and 8-15 parts additive B. In this invention, the stably loaded cerium ions can effectively exert their specific coordination and capture effect on heavy metals. The chitosan introduced into the carrier can enhance the electrostatic and chelate adsorption of anionic pollutants and organic molecules. Simultaneously, the well-developed pores formed after shellac carbonization combine with the network structure of chitosan, further increasing the specific surface area of ​​the material and the adsorption capacity of organic pollutants, achieving highly efficient and stable adsorption of heavy metals, dyes, and organic pollutants.

A pest control composition includes from about 4 wt % to about 10 wt % of sodium lauryl sulfate; one or more C5 to C9 hydrotropic salt; from about 1 wt % to about 10 wt % of one or more active ingredients selected from the group consisting of corn mint oil, peppermint oil, spearmint oil, rosemary oil, thyme oil, citronella oil, clove oil, cedarwood oil, cinnamon oil, geranium oil, eugenol, 2-phenylethyl propionate, menthol, menthone, thymol, carvone, camphor, methyl salicylate, p-cymene, linalool, geraniol, cinnamyl acetate, cinnamic alcohol, cinnamaldehyde, citronellol, eucalyptol / 1,8-cineole, alpha-pinene, bornyl acetate, gamma-terpinene, and combinations thereof; and from about 60 wt % to about 95 wt % of water. The pest control composition exhibits a water peak in a 2H spectrum having a width encompassing 90% of the area of the entire water signal of about 50 Hz or more, as determined by the 2H NMR Method.

The invention discloses a compound fluralab chewable tablet and a preparation method thereof, and relates to the technical field of veterinary drug preparations, the chewable tablet is composed of fluralab, pyrantel and moxidectin solid dispersion constructed by poloxamer 407 / lauryl sodium sulfate (or sodium dodecyl sulfate); preferably, the particle size D50 of the dispersion is 5-30 microns, and D90 is less than or equal to 80 microns. The preparation method comprises the following steps: firstly, dissolving moxidectin in the system to form a clear solution, drying under reduced pressure, and grinding and sieving at low temperature to obtain a dispersed material; premixing with microcrystalline cellulose, then mixing with lactose, adding a disintegrating agent and a lubricating agent, and carrying out prepressing-main pressing two-stage tabletting to obtain the tablet. The system can maintain amorphous distribution of moxidectin in the tablet, the content uniformity and dissolution and acceleration stability are remarkably improved, broad-spectrum synergy is formed by the moxidectin, the fluralasodium and the pyrantel, and the moxidectin tablet is suitable for killing fleas and ticks, treating roundworms and hookworms and preventing canine heart filariasis and tubuloidiasis.

The invention discloses a decontamination and dust fall reagent as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a compound solution: adding ferrous gluconate, sodium alkyl sulfosuccinate, sodium alcohol ether sulfate, lauryl sodium sulfate and polyacrylamide into deionized water according to the mass fraction of 0.10%-0.15%, 0.05%-0.20%, 0.05%-0.15%, 0.10%-0.15% and 0.005%-0.02% respectively to obtain the compound solution; (2) preparing micro-nano bubble water; and (3) adding the compound solution into the micro-nano bubble water in a volume ratio of 1: (0.5-2), and fully mixing the compound solution and the micro-nano bubble water to obtain the decontamination and dust fall reagent. According to the decontaminating and dust-settling reagent prepared by the invention, an environment-friendly surfactant is selected, so that dust can be settled, toxic and harmful gases generated by explosion can be removed by utilizing the characteristic that micro-nano bubble water directly participates in catalytic oxidation, and a good decontaminating and dust-settling effect is achieved.

The application discloses a preparation method and application of Lactobacillus plantarum fermentum based on environmental stress, and comprises the following steps: activating Lactobacillus plantarum; inducing and culturing the Lactobacillus plantarum in a culture medium containing sodium dodecyl sulfate to obtain Lactobacillus plantarum under environmental stress; dissolving milk powder in deionized water, adding alkaline protease, adjusting the pH to 7-10, and performing enzymolysis to prepare an enzymolysis solution; mixing the enzymolysis solution with sugar to obtain a fermentation substrate; inoculating the Lactobacillus plantarum into the fermentation substrate, performing fermentation culture, centrifuging to collect supernatant, sterilizing, and obtaining the Lactobacillus plantarum fermentum under environmental stress. It is found for the first time that sodium dodecyl sulfate stress can promote the synthesis of anti-inflammatory peptides of Lactobacillus plantarum, and the efficacy threshold of a natural strain is broken. The method is mild in conditions, simple in operation, is conducive to industrialized production, and fully guarantees the stability of product quality.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a latent curing epoxy resin based sound absorption and insulation composite material and application thereof. The composite material is prepared from bisphenol A type epoxy resin, a latent curing agent, a latent accelerant, a triethylene tetramine functionalized three-dimensional microporous metal organic framework material containing europium-cobalt bimetallic clusters, a lauryl sodium sulfate intercalated zinc-aluminum layered bimetal hydroxide halloysite nanotube hybrid body, hollow glass beads, fumed silica, a coupling agent, a coupling agent and a coupling agent. A silane coupling agent and acetone. The preparation method comprises the following steps: dissolving the epoxy resin in acetone, adding the silane coupling agent and water, stirring, heating, adding the functionalized metal organic framework material and the hybrid, carrying out vacuum concentration and ultrasonic dispersion, adding the hollow glass beads and the fumed silica, finally adding the curing agent and the accelerant, and carrying out vacuum defoaming and segmented heating curing molding. The material has excellent sound absorption and sound insulation performance.

The application discloses a lanthanum-cobalt composite catalyst and a preparation method and application thereof. The lanthanum-cobalt composite catalyst is composed of La2O2SO4, Co4S3 and Co3O4. Co(NO3)2.6H2O, La(NO3)3.6H2O, urea and sodium dodecyl sulfate are dissolved in an isopropyl alcohol solution to form a reaction solution, a precursor is obtained through a solvothermal method, and the lanthanum-cobalt composite catalyst is prepared through calcination. The prepared catalyst is used for selectively oxidizing ethylbenzene into acetophenone under the condition that molecular oxygen is used as an oxidant and no solvent is used, and excellent catalytic performance is shown. The catalytic system meets the requirements of green chemical industry and sustainable development.

The invention discloses an efficient flame-retardant fire extinguishing agent for rapidly extinguishing a lithium battery fire and a preparation formula, and relates to the technical field of fire fighting. The fire extinguishing agent is composed of a liquid-phase component and a solid-phase component, wherein the liquid-phase component comprises ethylene glycol, triethanolamine, fluoroalkyl betaine, sodium dodecyl benzene sulfonate, a phosphate flame retardant, an orange peel extracting solution and purified water; the solid-phase component comprises dodecyl sulfate, ammonium phosphate, potassium perchlorate, sodium carboxymethyl cellulose, polyacrylamide, benzotriazole and the like. The method comprises the following steps: drying and activating solid-phase components after graded crushing, and stirring in a nitrogen atmosphere; carrying out segmented treatment on liquid-phase components, and carrying out ultrasonic emulsification on an orange peel extracting solution; and after solid-liquid mixing, carrying out vacuum defoaming, high-speed shearing dispersion and homogenization treatment. According to the lithium battery fire extinguishing agent, component particle sizes with different dissolution rates are matched through graded crushing, nanoscale dispersion is achieved through ultrasonic emulsification, the bubble residual rate is reduced through vacuum defoaming, and the problems that a traditional lithium battery fire extinguishing agent is low in insulativity, low in cooling efficiency and insufficient in flame retardant efficiency are solved.

This invention discloses a denitrification biological carrier, its preparation method, and its application. The raw materials for preparing the denitrification biological carrier include an iron agent, modified activated carbon, polycaprolactone, sodium dodecyl sulfate, and a hydrogel binder. The modified activated carbon is 3-chloro-2-hydroxypropyltrimethylammonium chloride-modified activated carbon. The iron agent not only removes dissolved oxygen from water but also reduces total nitrogen in wastewater. The modified activated carbon improves its adsorption affinity for nitrogen-containing compounds. Polycaprolactone serves as a slow-release carbon source for denitrification, exhibiting high carbon source utilization. Sodium dodecyl sulfate, through its foaming properties, together with the modified activated carbon, iron agent, and polycaprolactone, forms a high-mechanical-strength, rough, and porous biological carrier structure, providing excellent attachment conditions for heterotrophic denitrifying bacteria. Therefore, applying the denitrification biological carrier of this invention to wastewater treatment systems can achieve good nitrogen removal efficiency and economic benefits.

The invention relates to porous hydrogel based on a photo-thermal material as well as a preparation method and application of the porous hydrogel, and relates to the technical field of hydrogel. The preparation method comprises the following steps: mixing a photo-thermal material with sodium alginate and sodium polyacrylate, adding lauryl sodium sulfate for foaming, and then performing freeze crosslinking and electrostatic self-assembly, thereby obtaining the photo-thermal composite material. The porous hydrogel based on the photo-thermal material prepared by the preparation method provided by the invention can efficiently realize interface evaporation and has excellent salt resistance and antibacterial performance, the pure water evaporation rate can reach 3.03 kg.m <-2 >. H <-1 >, the evaporation rate in 20% saline water is kept at 2.43 kg.m <-2 >. H <-1 >, and after the porous hydrogel is in dynamic contact with escherichia coli for 18 hours, macroscopic bacterial colonies do not exist, and the antibacterial rate reaches 99%; in addition, self-floating can be achieved, cost can be saved in practical application, and a new thought is provided for the interface evaporator for sea water desalination.

The application provides a preparation method and application of a near-infrared two-region fluorescent sensor, and chiral single-walled carbon nanotubes are separated by using a double water phase extraction method; materials in the separation process include deionized water, polyethylene glycol, dextran, sodium dodecyl sulfate, sodium deoxycholate and cholic acid sodium hydrate; the chiral single-walled carbon nanotubes are dispersed and mixed with 4-nitrobenzene tetrafluoroboric acid diazonium salt to obtain the fluorescent sensor; high-purity (6,5)-SWCNT is efficiently and simply separated by using the double water phase extraction technology, the prepared SWCNT-NBD nanomaterial has good optical performance, including bright light emission in the near-infrared two-region, has good penetration capacity on biological tissues, the fluorescent detector (SWCNT-NBD) has low detection line, wide linear range, good selectivity on DA, and is convenient to prepare and low in cost.

The application discloses heparin sodium cream and a preparation method thereof, and belongs to the technical field of pharmaceutical preparation production. The heparin sodium cream comprises the following components: heparin sodium, propylene glycol, hydroxyphenyl ethyl ester, sodium dodecyl sulfate, glycerol monostearate and distearate, octadecanol, liquid paraffin, white vaseline and water. The preparation method comprises the following steps: preparing an oil phase and mixing an aqueous phase; taking part of the mixed aqueous phase and the oil phase to form a water-in-oil type primary emulsion; then adding the remaining mixed aqueous phase into the primary emulsion, inducing phase transition into an oil-in-water type cream under mild conditions, and obtaining the finished product after vacuum defoaming and gradient cooling. The application realizes high-efficiency emulsification under mild conditions below 80 DEG C and 3000 rpm through a controlled phase inversion emulsification process, so that the particle size (D99) of the emulsion droplets is less than 5 microns, and the problem that the active substance heparin sodium loses activity under severe conditions is solved completely, and the stability of the product is improved significantly.

The invention discloses a forest fire prevention and extinguishment gel material and a preparation method thereof, and the forest fire prevention and extinguishment gel material comprises the following other raw materials in parts by mass: 3 parts of sodium silicate; 0.6 to 0.8 part by mass of hydroxypropyl methyl cellulose; 3-4 parts by mass of sodium bicarbonate and 1 part by mass of lauryl sodium sulfate; and 13-17 parts by volume of alkaline silica sol. The gel material provided by the invention has excellent water-retaining property, high viscosity, strong adhesive power, high foam stability and thermal stability. After combustion, a compact SiO2 carbon layer can be formed, and a lasting physical barrier is formed.

The effect of aqueous compositions of copper based fungicides is improved by including a mixture of sodium dioctyl sulfosuccinate and sodium lauryl sulphate surfactants in the aqueous composition which does not require the presence of a bicarbonate.

The application provides a fast-hardening early-strength high-pressure and freeze-resistant cement material and a preparation method thereof, belongs to the technical field of cement materials, and the cement material comprises silicate cement clinker, natural anhydrous gypsum, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent, a crystal bridge-pore dual functional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent is prepared by sintering, quenching and heat reaction of bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, and surface modification by KH-550. The crystal bridge-pore dual functional agent comprises a calcium silicate hydrate crystal bridge agent and a polymer-SiO2 composite elastic pore forming agent. The polymer-SiO2 composite elastic pore forming agent is prepared by shearing emulsification of an oil phase prepared from styrene, butyl acrylate, divinylbenzene and polyglyceryl-10 diisostearate and an aqueous phase prepared from deionized water, sodium dodecyl sulfate and polyethylene glycol allyl methyl ether, ammonium persulfate reaction and tetraethyl orthosilicate reaction.

The application discloses a preparation method of a titanium dioxide coated MIL-53(Fe) electrocatalyst. First, a catalyst MIL-53(Fe) is obtained through a hydrothermal method, then the catalyst is heated, stirred and dried under mild conditions, and titanium dioxide obtained by hydrolysis of tetra-n-butyl titanate is uniformly coated on the MIL-53(Fe) under the action of dodecyl sulfate, finally, the catalyst is improved in contact with nitrogen through heat treatment, so that the titanium dioxide coated MIL-53(Fe) with good stability is prepared.

The application relates to the field of building materials and discloses a sound and heat insulation light building material and a preparation method thereof. The light building material comprises cement, fly ash, river sand, quartz sand, a foaming agent, a modified composite filler-based water reducing agent and water. The foaming agent is made of sodium dodecyl sulfate, hydroxypropyl methyl cellulose, modified nano-aluminum oxide and nano-silicon dioxide. The modified nano-aluminum oxide is prepared by the following steps: reacting oleic acid with nano-aluminum oxide, emulsifying through a Pickering emulsion method, and selectively dissociating through a saponification reaction induced by sodium hydroxide. The modified composite filler-based water reducing agent is prepared by the following steps: in-situ esterification modification of a composite filler made by grafting isoprenyl alcohol polyoxyethylene ether on graphene oxide and carbon fiber, and then free radical copolymerization with acrylic acid. The light building material prepared by the application has high compressive strength and flexural strength, small water absorption and good heat insulation performance.

The invention discloses oxidized paraffin and antirust wax and a preparation method thereof, and relates to the field of paraffin. The antirust wax comprises oxidized paraffin, an emulsifier, an antirust agent and water, and the emulsifier is at least one of sorbitan monooleate, lauryl sodium sulfate and fatty alcohol-polyoxyethylene ether; the antirust agent is at least one of cyclohexylamine stearate, alkenyl succinic acid and alpha-mercaptobenzothiazole; the oxidized paraffin is loaded with a Mn metal element through a carrier. The catalyst loaded with the active component Mn is added in the preparation process of the oxidized paraffin, the acid value and the soap value of the oxidized paraffin are effectively increased, the oxidized paraffin interacts with the specific emulsifier and the antirust agent, the emulsifier does not affect the anti-oxidation protection function of functional components, and meanwhile, the antirust agent and the oxidized paraffin cooperate with each other to achieve the anti-corrosion effect in a synergistic mode; and the antirust capability of metal in a humid and hot environment and an acid-base environment is improved, and the application prospect is expanded.

This invention discloses a polyvinyl alcohol-based radiation-cooled porous material and its preparation method, belonging to the field of new materials. The material is prepared from a foaming system comprising an aqueous solution of polyvinyl alcohol, hydrophilic silica, a shrinkage-reducing agent, a foam stabilizer, polyethyleneimine, epichlorohydrin, and sodium dodecyl sulfate, through mechanical stirring foaming, heating curing, and atmospheric pressure drying. This invention effectively suppresses defects such as volume shrinkage, internal cracking, and skin separation in porous materials under atmospheric pressure drying conditions through the synergistic effect of the shrinkage-reducing agent and the foam stabilizer, avoiding the complex process of traditional freeze-drying. The porous material possesses both a high solar reflectivity of 93%–98% and an average infrared emissivity of over 97% within the 8–13 μm atmospheric window, enabling a cooling effect 10–20°C lower than ambient temperature without consuming additional energy, thus possessing significant practical application value.

This invention discloses a biomimetic tree-like hydrate promoting device, belonging to the technical field of natural gas hydrate preparation. It uses tree-like absorbent paper modified with sodium dodecyl sulfate. The device includes a main trunk and 10 branches symmetrically distributed on both sides of the trunk's centerline. The width of the main trunk gradually decreases from bottom to top. The branches are spaced apart along the bottom of the main trunk, and the length of each branch gradually decreases from bottom to top along the length of the main trunk. The length of each branch is the distance from the center of the branch's edge to the center of its end. The width of the branches first increases and then decreases in the direction away from the main trunk. By mimicking the shape of a natural tree, a larger surface area is provided, allowing more gas and water molecules to contact the surface of the promoting material, effectively increasing the gas-liquid contact area and accelerating the hydrate formation process. Especially within a limited space, it enables more efficient gas conversion and rapid growth of methane hydrates.

The invention relates to the field of material science and engineering, and particularly discloses an anti-caking potassium nitrate production method which comprises the following steps: taking high-purity potassium nitrate crystals as a base material, selecting lauryl sodium sulfate as an anti-caking agent, and adding 10-100g of sodium dodecyl sulfate into each ton of base material; the production method comprises the following steps: dissolving lauryl sodium sulfate in pure water to prepare a transparent modified solution; uniformly wetting the surface of the crystal with the modification liquid by adopting a layer-paving spraying method; drying the wet material in a non-closed heating environment in which a moisture removal channel is reserved, and inducing the formation of a stable hydrophobic membrane on the surface; and finally, carrying out secondary mechanical mixing and granulating to obtain a finished product. According to the invention, through liquid-phase trace coating and a specific temperature control and moisture removal process, the hygroscopicity and caking tendency of the crystal are remarkably reduced while the water insoluble substance and clarity of the product are ensured to completely meet the analytic purity standard, and the problems of turbid solution, excessive introduction of organic impurities and damaged purity caused by the traditional physical anti-caking technology are effectively solved.

The application provides a gas channeling prevention plugging composition and application thereof, and the gas channeling prevention plugging composition comprises a first system and a second system; the first system comprises a crosslinking monomer, a crosslinking agent, a gelation control agent and an initiator; and the second system comprises sodium dodecyl sulfate and N, N, N', N'-tetramethyl-1, 3 propanediamine. The gas channeling prevention plugging composition provided by the application comprises two systems, and the two systems have complementary effects; when the gas channeling prevention plugging composition is used in carbon dioxide displacement exploitation, the plugging rate is high and the application range is wide.

The invention discloses a preparation method of a 3D graphene-loaded tin oxide composite material. The preparation method comprises the following steps: preparing a precursor solution from graphene oxide, tin tetrachloride pentahydrate and ascorbic acid; dropwise adding a lauryl sodium sulfate solution into the precursor solution, and fully mixing to obtain a mixed solution; transferring the mixed solution into a glass bottle, and sealing and heating to promote the self-loading process of the solution; performing freeze thawing / 80 DEG C thermal reduction treatment on the preformed sample to form a preliminary composite material of tin oxide and graphene; repeatedly washing the sample subjected to thermal reduction by using ethanol to remove residual impurities, and then carrying out drying treatment; and carrying out annealing heat treatment on the dried sample in a nitrogen atmosphere to obtain the 3D graphene-loaded tin oxide composite material. The preparation method of the 3D graphene loaded tin oxide composite material provided by the invention is simpler in preparation process, lower in cost and suitable for large-scale industrial production.

The invention discloses a multi-core green active microcapsule oil-displacing agent and a preparation method and application thereof, the preparation method comprises the following steps: adding myristic acid and cinnamyl aldehyde into absolute ethyl alcohol, stirring at room temperature until the myristic acid and the cinnamyl aldehyde are dissolved to obtain a composite core material solution, and standing for later use; adding sodium alginate into deionized water, stirring at 30-60 DEG C until no floccules exist to obtain a wall material solution, and standing for later use; mixing the composite core material solution with the wall material solution, adding lauryl sodium sulfate, stirring at 75-85 DEG C for 1-3 hours to form a composite electrostatic spraying solution, and standing for later use; performing electrostatic spraying on the composite electrostatic spraying solution to prepare primary microcapsules, curing with a calcium chloride solution, washing with water, and freeze-drying to obtain the microcapsule oil-displacing agent. The microcapsule has a multi-core structure, is high in load rate, is matched with a targeted release characteristic, can enhance the residual oil stripping efficiency and the crude oil recovery efficiency when being used in the field of oil displacement, and can also be used in the field of agriculture.

This invention provides viscose macrobiofibers containing antioxidant active components and a method for preparing them. [Solution] The viscose macrobio fiber prepared by reacting raw materials by weight of 20-24 parts COFs carrier, 5-8 parts plant-derived antioxidant active component, 200-240 parts spinning solution, 2-4 parts sodium dodecyl sulfate, 2-4 parts glyceryl monooleate, 3-5 parts cyclodextrin, 2-4 parts titanium dioxide, and 3-5 parts silane coupling agent, has the antioxidant active component attached to the COFs carrier during the preparation process. In the prepared viscose macrobio fiber, the COFs carrier functions as the backbone of the viscose macrobio fiber, and the ends of the COFs carrier are exposed to or close to the surface of the viscose macrobio fiber. The antioxidant active component on the COFs carrier is easily transferred to the surface of the fiber, and the viscose macrobio fiber has a good antioxidant effect.

This invention belongs to the field of pharmaceutical analysis technology and relates to a method for detecting the content of dimethicone and silica in simethicone oral sol-coating membranes. The simethicone oral sol-coating membrane is dissolved in dimethyl sulfoxide, followed by a first extraction with n-hexane, and then a second extraction with sodium dodecyl sulfate. The material from the second extraction is centrifuged, and the supernatant is dehydrated to obtain a test solution. The absorbance of the test solution is detected using infrared spectrophotometry to obtain an infrared absorption spectrum. Data on the Si-CH3 and Si-O absorption peaks are obtained from the infrared absorption spectrum. The content of dimethicone is calculated based on the Si-CH3 absorption peak data, and the content of silica is calculated based on the Si-CH3 and Si-O absorption peak data. This invention can simultaneously detect the content of dimethicone and silica in simethicone oral sol-coating membranes with high accuracy and good repeatability.

The invention discloses a passivation solution for improving the corrosion resistance of X40CrMoVN16-2 high-nitrogen martensitic stainless steel, and belongs to the technical field of stainless steel surface treatment. The passivation solution is prepared from, by mass, 6%-10% of citric acid, 3%-5% of hydrogen peroxide, 0.8%-1.2% of sodium molybdate, 0.1%-0.16% of lauryl sodium sulfate and 0.06%-0.12% of nano-silica sol, the passivation temperature is 35-45 DEG C, and the passivation time is 50-60 min. The self-corrosion current density of a sample passivated by the passivation solution is reduced to 0.076 [mu] A.cm <-2 > from 0.892 [mu] A.cm <-2 > of an unpassivated sample, the pitting potential is increased to 1.54 V from-1.55 V of the unpassivated sample, and the corrosion resistance of the X40CrMoVN16-2 high-nitrogen martensitic stainless steel is effectively improved.