309 results about "Octadecane" patented technology

The invention relates to the field of pharmaceutical analytical chemistry, in particular to a method for determining tandospirone and salt intermediates thereof, high performance liquid chromatography is adopted, and chromatographic conditions include that a chromatographic column with octadecylsilane chemically bonded silica as a filler is adopted, and gradient elution is performed by a mobile phase A and a mobile phase B; wherein the mobile phase A consists of a first water phase and acetonitrile; the mobile phase B is composed of a second water phase and acetonitrile; the first water phase is a water solution containing monopotassium phosphate and sodium hexanesulfonate, and the pH value of the first water phase is 3.0-3.8; the second water phase is an aqueous solution containing monopotassium phosphate and sodium hexanesulfonate, and the pH value of the second water phase is 1.8-2.6. The testing method disclosed by the invention has good specificity, accuracy and repeatability, and can be used for monitoring the quality of the tandospirone raw material medicine.

The invention relates to the field of plasma separation and detection, in particular to a composition for separating plasma and a using method thereof. The composition comprises: a phase change component, which is selected from n-alkanes, which are selected from at least one of n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, n-eicosane, n-heneicosane or n-docosane; a liquid phase carrier component, wherein the liquid phase carrier component is selected from silicone oil; the structural framework and rheology regulation and control component comprises fumed silica, and the structural framework and rheology regulation and control component comprises fumed silica; the dispersion and stabilization auxiliary agent component is selected from at least one of TiO2 and BaSO4, the density adjusting filler component is selected from at least one of TiO2 and BaSO4, and the dispersion and stabilization auxiliary agent component comprises a silane coupling agent. According to the device, plasma and blood cells can be reliably, rapidly and effectively separated only through one-time low-temperature centrifugation, and remixing caused by transportation jolting can be avoided.

The invention relates to the technical field of heat energy storage materials, and particularly provides a silicon dioxide aerogel composite phase change heat storage material and a preparation method thereof. The method comprises the following steps: mixing an organic silicon source, absolute ethyl alcohol and deionized water according to a specific ratio, fully stirring to obtain a mixed solution, and dropwise adding an acid catalyst into the mixed solution at room temperature for hydrolysis reaction to obtain a hydrolysate; sequentially adding a drying control agent and an alkali catalyst, and standing for gelation reaction to obtain gel; adding an organic solvent to carry out aging reaction, and then adopting the organic solvent to carry out replacement for multiple times to obtain alcogel; replacing the alcohol gel with an organic solvent for multiple times to obtain wet gel, soaking the wet gel in an excessive molten phase change material, and carrying out normal-pressure solvent replacement and drying at 40 DEG C to obtain the phase change material, the loading capacity of octadecane in the obtained CPCM is about 83%, the phase change enthalpy reaches up to 192J / g, the heat conductivity is as low as 0.0812 W / m.K, and no obvious leakage occurs after 200 times of circulation.

The invention relates to the technical field of chemical fiber manufacturing, in particular to a preparation process of graphene reinforced porous hollow polyester fibers. The problems that existing polyester fibers are insufficient in mechanical property and poor in moisture absorption and air permeability are solved. The preparation method comprises the following steps: modifying a PET sheet by using 2, 2-dimethylolpropionic acid and hydroxyl-terminated polydimethylsiloxane to obtain modified PET; the preparation method comprises the following steps: taking chitosan modified graphene as a carrier, and loading metal ions to obtain loaded graphene; polyethylene glycol and sodium bicarbonate are used as pore-foaming agents; modifying octadecyl dimethyl allyl ammonium chloride to obtain an antibacterial toughening agent; all the components are mixed, and the polyester fiber is prepared through melt spinning, stretching, heat treatment and alkali treatment. The mechanical property of the fiber is improved through the introduction of graphene and the modification treatment of the PET sheet; by utilizing the composite pore-foaming agent and adjusting the process, the moisture absorption and air permeability of the fiber are improved, and the service life of the fiber is prolonged.

The invention relates to a phase change energy storage fiber with ultraviolet shielding and heat regulation and control functions and a preparation method of the phase change energy storage fiber. The preparation method comprises the following steps: dissolving thermoplastic polyurethane in N, N-dimethylformamide to form a spinning mother solution; the preparation method comprises the following steps: firstly, adding nano titanium dioxide and uniformly dispersing, then adding a silicon dioxide shell layer-octadecane core layer phase change microcapsule, and stirring and ultrasonically defoaming to obtain a uniform composite spinning solution; extruding the spinning solution into a coagulating bath consisting of isopropanol and deionized water through an injection pump, and coagulating and forming to obtain nascent fibers; finally, washing, solvent replacement, tension setting and drying treatment are conducted, and compared with the prior art, the obtained fiber has efficient ultraviolet shielding performance and remarkable phase change energy storage capacity and has wide application prospects in the fields of intelligent temperature adjusting textiles, outdoor protective garments, building heat management and the like.

The invention discloses a microcapsule phase change cement material, which is prepared by compounding a microcapsule with phase change performance and a cement matrix, the microcapsule is of a core-shell structure, the raw materials of the shell are melamine, urea and formaldehyde, the raw material of the core material is octadecane, and Tween 80 and lauryl sodium sulfate are used as emulsifiers. The preparation method comprises the following steps: 1, preparing an MUF resin prepolymer; 2, preparing a core material O / W emulsion; 3, polymerization reaction of the microcapsules; and 4, preparing the microcapsule phase change cement material. When the composite material is used as a cement-based composite material, the melting temperature ranges from 25 DEG C to 29 DEG C, the crystallization temperature ranges from 19 DEG C to 23 DEG C, the melting enthalpy ranges from 13.47 J / g to 29.78 J / g when the mixing amount is 10%-30%, the crystallization enthalpy ranges from 12.94 J / g to 28.41 J / g, and the coating efficiency is 67.5%. The initial decomposition temperature ranges from 386.13 DEG C to 390.96 DEG C, the finishing temperature ranges from 399.49 DEG C to 406.42 DEG C, and the maximum degradation temperature ranges from 438.78 DEG C to 443.64 DEG C; the heat conductivity coefficient is 0.3216 to 0.3949, and is improved by 39.4 percent compared with that of standard cement.

The invention discloses a surface low-energy silicon dioxide shell phase change microcapsule, a moisture resistance control construction method and application thereof. Firstly, core-shell structure microcapsules with octadecane as a heat energy storage core material and silicon dioxide as a protective shell layer are prepared through an interfacial polymerization method, and phase change microcapsule powder is obtained. And then, constructing an alkylated low-energy interface layer on the surface of the microcapsule shell by utilizing an organosilane hydrolysis-condensation reaction. The phase change microcapsule treated by the method can effectively inhibit a shell layer from adsorbing free moisture in a humid environment, alleviate the phenomenon of interface instability at the initial stage of cement hydration, and improve the construction fluidity and circulating energy storage durability of a cement-based material. Meanwhile, the composite can be used as functional microparticles to be applied to building outer surface coatings, and antifouling, anti-infiltration and photo-thermal regulation and control effects are achieved. The method is simple, convenient and high in adaptability, large-scale production can be achieved, and a new solution is provided for construction of building functional materials with energy conservation, energy storage and interface stability.

The invention relates to the technical field of analysis and detection, and discloses a construction method of a fingerprint spectrum of relevant characteristic peaks of rhizoma coptidis paste and radix rehmanniae recen, and the construction method comprises the following steps: S1, preparing a reference solution and a test solution; and S2, injecting the reference substance solution and the test solution into a high performance liquid chromatograph, adopting a chromatographic column with octadecylsilane chemically bonded silica as a filler, taking acetonitrile as a mobile phase A, taking a 0.0125 mol / L monopotassium phosphate solution as a mobile phase B, eluting according to a specified gradient program, and detecting by adopting an ultraviolet detector to obtain the fingerprint spectrum. By means of the provided construction method of the fingerprint spectrum of the relevant characteristic peaks of the coptis chinensis paste and the radix rehmanniae recen, the sequence and the mutual relation of the characteristic peaks can be indicated, and the effect of the fingerprint spectrum of the relevant characteristic peaks of the coptis chinensis paste and the radix rehmanniae recen is effectively represented.

The invention relates to a method for detecting genotoxic impurities of rupatadine fumarate, which is characterized in that a phosphate buffer solution is matched with acetonitrile, a high performance liquid chromatography method is adopted, a chromatographic column is a silica gel bonded octadecylsilane column, a gradient program is adopted for elution, and the content of the rupatadine fumarate genotoxic impurities in the rupatadine fumarate genotoxic impurities in the rupatadine fumarate genotoxic impurities is detected. Effective separation between rupatadine fumarate and genotoxic impurities and between genotoxic impurities can be achieved, accurate quantitative analysis can be achieved, and the quality of drugs can be effectively controlled.

The invention belongs to the technical field of pharmaceutical analysis, and particularly relates to a method for separating and determining nafamostat mesylate SM2 and related impurities thereof. The method is a high performance liquid chromatography, and comprises the following steps: by taking octadecylsilane chemically bonded silica as a chromatographic column filler, a potassium hexafluorophosphate solution as a mobile phase A and acetonitrile as a mobile phase B, separating nafamostat mesylate SM2 and related impurities thereof through linear gradient elution; and detecting by using detection wavelengths of 200 nm to 240 nm and 250 nm to 280 nm to obtain a chromatogram, so that effective determination of the nafamostat mesylate SM2 and the related impurities thereof is realized. The method provided by the invention adopts common buffer salt as a mobile phase, and has the characteristics of short analysis time, strong specificity, high sensitivity and good reproducibility.

The invention belongs to the field of pest repellents, and particularly relates to application of n-octadecane in preparation of a pest repellent. According to the invention, n-octadecane (n-octadecane, with the CAS number of 593-45-3) is screened and identified from chemical signal substances on the body surface of the spider brachyta, and the n-octadecane has remarkable behavior regulation and control activity. A behavioral experiment proves that the pest repellent taking n-octadecane as a unique effective repelling component can remarkably induce the repelling behavior of cockroach pests such as cockroaches and periplaneta americana. The invention provides a novel, environment-friendly and efficient prevention and control product and a prevention and control method for pest prevention and control.

The invention relates to the technical field of non-ferrous metal beneficiation, in particular to a flotation reagent composition for recycling micro-fine particle copper sulfide from copper oxide acid leaching residues and a beneficiation method of the flotation reagent composition. The flotation reagent composition for recovering copper sulfide from copper oxide acid leaching residues is characterized by comprising a collecting agent, a hydrophobic agglomeration agent and a foaming agent, and the collecting agent is ethyl thioacetate; the hydrophobic agglomeration agent is prepared from octadecyl triethoxy silane and kerosene; and the foaming agent is selected from terpilenol, methyl isobutyl carbinol or sec-octanol. The ethyl thioacetate serving as a collecting agent is stable in chemical property in an acid environment, weak in gangue mineral collecting capacity and good in selectivity in the copper sulfide mineral flotation process, and therefore the grade and the recovery rate of obtained copper sulfide concentrate are higher.

The application discloses a detection method and application of a fingerprint spectrum and a mark characteristic effective component of compound tung oil for burns and a detection method of the fingerprint spectrum, and the detection method of the fingerprint spectrum comprises the following steps: preparing a sample solution and a standard control solution of the compound tung oil for burns, and adopting HPLC chromatography to construct the fingerprint spectrum of the compound tung oil for burns; the HPLC chromatography conditions for constructing the fingerprint spectrum of the compound tung oil for burns comprise the following steps: adopting an octadecyl silica water-resistant analysis column chromatographic column, adopting methanol (A) and 0.08-0.12% ammonium acetate (B) as a mobile phase, adopting a flow rate of 0.5-0.7 mL / min, and adopting a sample injection amount of 5-15 muL. The method system is reliable in results and provides a scientific screening method for quality control of the compound tung oil for burns.

The invention belongs to the technical field of desulfurizer preparation, and particularly relates to a desulfurizer for oil extraction of oil and gas fields and a preparation method thereof. The desulfurizing agent for oil extraction of the oil and gas field is prepared from the following raw materials: N-octadecyl-1, 3-propane diamine, an ionic liquid and organic copper mixture, ammonium molybdate, lysine sodium, hydroxyethylidene diphosphonic acid, polyoxyethylene sorbitan monostearate and the balance of water. According to the desulfurizing agent for oil extraction of the oil-gas field, water is used as a solvent, N-octadecyl-1, 3-propane diamine, an ionic liquid and organic copper mixture and ammonium molybdate in raw materials are used as main desulfurizing components to remove organic sulfur and inorganic sulfur, and lysine sodium, hydroxyethylidene diphosphonic acid and polyoxyethylene sorbitan monostearate are added, so that the desulfurizing agent for oil extraction of the oil-gas field is obtained. Due to the synergistic effect of the raw materials, the efficient removal of inorganic sulfur and organic sulfur in oil extraction of an oil and gas field is realized.

The invention discloses a leakproof composite phase change material and application of the leakproof composite phase change material in wide temperature range operation of a lithium battery, and belongs to the technical field of battery thermal management. Boron nitride nanosheet modified ceramic fibers are used as an internal supporting framework to enhance thermal conductivity and provide capillary constraint, and a core material is a phase change medium such as paraffin or n-octadecane; the invention further discloses a preparation method of the composite material and application of the composite material in lithium battery thermal management, the composite material solves the problems that a traditional phase change material is prone to leakage, poor in heat conduction and single in function, the battery can be rapidly heated at low temperature, heat can be efficiently absorbed and diffused at high temperature / normal temperature and high rate, and the service life of the battery is prolonged. The safe, efficient and stable operation of the lithium battery in a wide temperature range is realized, the leak-proof performance is high, the cycling stability is good, the preparation cost is controllable, and the application prospect is wide.

The invention discloses a liquid-liquid coalescence filter element material for oil dehydration, which takes glass fiber paper as a substrate and is coated with the following modified materials in percentage by mass: 1 to 5 percent of nano silicon dioxide, 2 to 10 percent of gamma-aminopropyltriethoxysilane, 2 to 10 percent of octadecyltriethoxysilane and the balance of absolute ethyl alcohol. The water contact angle of the liquid-liquid coalescence filter element material is larger than 150 degrees, and the oil contact angle is smaller than 10 degrees; the invention also discloses a preparation method which comprises the following steps: uniformly mixing the raw materials to form a modified solution, spraying the modified solution on the surface of the cured glass fiber paper, and drying to obtain the liquid-liquid coalescence filter element material. According to the invention, the nano silicon dioxide is modified by gamma-aminopropyltriethoxysilane and octadecyltriethoxysilane, so that the super-hydrophobicity and super-lipophilicity of the glass fiber paper are improved; the prepared liquid-liquid coalescence filter element material is uniform and firm in coating adhesion and suitable for the fields of oil product production, storage, transportation and the like.

The invention discloses a preparation method and application of a super-hydrophobic antifouling coating with a self-repairing function, and belongs to the technical field of modification of self-repairing super-hydrophobic coatings of textiles. The method comprises the following steps: mixing boric acid, ethanol and n-octadecyltriethoxysilane, heating and stirring to completely dissolve the boric acid to obtain a mixed solution; and dropwise adding water into the mixed solution while heating and stirring, and then standing and reacting to form a B-O-Si covalent bond, thereby obtaining the super-hydrophobic antifouling coating material. After the fabric is subjected to immersion treatment by the super-hydrophobic antifouling coating material, a good dynamic hydrophobic effect is shown, the original air permeability and moisture permeability of the fabric are hardly influenced, and compared with the original fabric, the air permeability is reduced by 1.9-6.6%, and the moisture permeability is reduced by 3.2-4.8%; after the super-hydrophobic antifouling coating fabric is worn and damaged by washing, the super-hydrophobic performance can be recovered under the condition of standing for 180 minutes or heating at 110 DEG C for 30 minutes.

The application discloses an environment-friendly fluorine-free super-hydrophobic coating material and a preparation method thereof, and belongs to the technical field of super-hydrophobic coating materials. The preparation method comprises the following steps: mixing hyperbranched polyurethane, ethyl acetate and propylene glycol methyl ether acetate for 10-20 min, then adding polydimethylsiloxane and octadecyl isocyanate to carry out mixing reaction for 60-80 min, then adding multistage microspheres to carry out ultrasonic treatment for 15-30 min, and then adding Isopar G, isophorone diisocyanate, silane coupling agent KH-560, dibutyl tin dilaurate and triethylenediamine to carry out stirring and dispersion for 30-50 min, so as to obtain the environment-friendly fluorine-free super-hydrophobic coating material. The environment-friendly fluorine-free super-hydrophobic coating material prepared by the application has good super-hydrophobicity, self-repairing function and wear resistance.

The present application relates to the field of pharmaceutical analysis, and particularly relates to a method for determining the content of cetirizine hydrochloride and preservatives in cetirizine hydrochloride oral solution. The method provided by the present application uses octadecyl bonded silica as the filler of the chromatographic column, uses a mixed solution with specific composition and proportion as the mobile phase, adopts isocratic elution, uses a content volumetric pipette to prepare the test sample solution, injects the test sample solution and the mixed control solution into the liquid chromatograph respectively to perform liquid chromatography, thereby obtaining the chromatogram of the test sample solution and the chromatogram of the mixed control solution respectively; and then according to the external standard method, the content of cetirizine hydrochloride, the content of the hydroxy methylbenzoate preservative and the content of the hydroxy propylbenzoate preservative in the cetirizine hydrochloride oral solution are calculated by the peak area. The method has strong specificity, high accuracy, good precision, linear relationship and stability, and is conducive to the evaluation of sample quality.

The invention relates to the technical field of polyacrylamide preparation, in particular to a preparation method of a temperature response type polyacrylamide water-in-water emulsion. The preparation method comprises the following steps: S1, mixing ammonium sulfate and a dispersion stabilizer, adding deionized water, and stirring to obtain a solution A; s2, mixing acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-methacryloyloxyethyl trimethyl ammonium chloride, N-vinyl pyrrolidone, octadecyl dimethyl allyl ammonium chloride and a modifier, and then adding water for dissolving, so as to obtain a solution B; and S3, mixing the solution A and the solution B, adjusting the pH value to 6.5-7.5, adding an initiator, and reacting to obtain the temperature-responsive polyacrylamide water-in-water emulsion. The invention provides a preparation method of a temperature response type polyacrylamide water-in-water emulsion, and aims to solve the problems of injection difficulty and insufficient high temperature resistance caused by poor solubility, poor rheological property and high injection viscosity of traditional PAM in related technologies.

The application discloses a kind of tetrapolymer type acidizing retarder and its preparation method and application, it is related to oil and gas exploitation technical field.The retarder is polymerized by acrylamide, sulfonate monomer, allyl polyoxyethylene ether and octadecyl dimethyl allyl ammonium chloride four monomers, other quaternary ammonium salt monomers except octadecyl dimethyl allyl ammonium chloride are not included in the system.By excluding the second quaternary ammonium salt monomer, electrostatic crosslinking caused by polyvalent cation center is cut off, and the viscosity of acid system is reduced to below 4 mPa·s.At the same time, the single quaternary ammonium salt structure unit produces adsorption isolation effect at rock interface, so that the retardation rate under the condition of 110 DEG C is maintained above 82%.The retarder provided by the application has low viscosity, high temperature resistance and salt resistance, and is suitable for high temperature deep well acidizing and fracturing operation.

The application discloses a kind of belongs to analytical detection technical field, specifically related to a kind of determination method of etomidate content in electronic cigarette oil, comprising the following steps: using step-by-step dilution method to pretreat the electronic cigarette oil to be measured to obtain test sample;Using high performance liquid chromatography tandem mass spectrometry technique to determine the content of etomidate in the test sample;The chromatographic conditions in the high performance liquid chromatography tandem mass spectrometry technique include: chromatographic column: n-octadecyl column;Mobile phase A phase: 4mmol / L-6mmol / L ammonium acetate+0.05% (v / v)-0.15% (v / v) formic acid aqueous solution;Mobile phase B phase: methanol.The determination method of etomidate content in the electronic cigarette oil can not only greatly save the solvent usage amount, but also can ensure the accuracy of detection, reduce the influence of matrix effect.

The invention relates to an etching solution for etching a composite layer coated on PET and a preparation method thereof, the etching solution comprises the following preparation raw materials by weight: 20-36% of hydrofluoric acid, 5-15% of an organic chelating agent, 3-5% of a surfactant, 2-4% of a modified nano system, and the balance of water; the organic chelating agent comprises organic acid and N-[3-(dimethylamino) propyl] octadecanamide. The etching solution has the effect of improving the etching stability of the etching solution.

The application relates to a rigid-flexible conversion composite phase change material suitable for battery thermal management and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The rigid-flexible conversion composite phase change material is composed of n-octadecane 70-90 wt%, polymer high molecular fixed phase change support material 5 wt% and expanded graphite 10%-25% in percentage by mass. The rigid-flexible conversion composite phase change material is stable in shape, can be converted between rigid materials and flexible materials with the change of temperature, can be used for heat preservation of lithium batteries in cold environments, and the required cold start time is shorter after the automobile is parked in the cold environment for a long time. The synthesis process of the material is simple, the material is convenient to apply, and the material has a wide application prospect.

The invention discloses a fingerprint spectrum of Huanglong cough-relieving granules and a construction method, and relates to the technical field of pharmaceutical analysis. The construction method comprises the following steps: (1) preparation of a test solution: taking Huanglong cough-relieving granules, and adding an extraction solvent for extraction; (2) preparing a reference substance solution; (3) preparing a reference medicinal material solution; (4) chromatographic conditions: octadecylsilane chemically bonded silica is used as a filler; the mobile phase A is acetonitrile, the mobile phase B is 0.1-0.2% phosphoric acid, the flow rate is 0.38-0.42 ml / min, the column temperature is 29-31 DEG C, the detection wavelength is 210 nm in 0-17 min, and the detection wavelength is 270 nm in 17-48 min; and (5) absorbing the solution, and adding the solution into a liquid chromatograph for detection. The fingerprint spectrum constructed by the method can systematically reflect the material basis, is relatively good in precision, repeatability and stability, and can be used for quality control of the Huanglong cough-relieving granules.

The invention relates to the technical field of mineral flotation, and discloses a method for compounding a lithium oxide collecting agent in a low-temperature environment, and the lithium collecting agent comprises the following compounding raw materials in percentage by mass: 15-25% of palmitic acid soap; 10%-20% of sulfonated petroleum; 5% to 10% of iso-tridecanol polyoxyethylene ether; 8%-15% of fatty alcohol-polyoxyethylene ether; 3%-8% of polyoxyethylene ether sodium sulfonate; 5%-10% of dipropylene glycol monomethyl ether; 8%-15% of sodium carbonate; 2%-5% of sodium hydroxide; 0.5%-2.0% of sodium fluoride; 0.5%-2.0% of aluminum sulfate; 1%-4% of tannic acid; a synergistic surfactant system is formed by constructing palmitic soap and sulfonated petroleum as a main collecting frame and compounding isomeric alcohol ether, fatty alcohol-polyoxyethylene ether and polyoxyethylene ether sodium sulfonate, dipropylene glycol monomethyl ether is introduced as a low-temperature mutual solvent, and the low-temperature mutual solvent is used for collecting the high-temperature-resistant oil-displacing agent for the oil-displacing oil-displacing agent for the oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil-displacing oil. The freezing point and viscosity of a collecting agent system are greatly reduced, the liquidity, uniformity and dispersion stability of the collecting agent are still kept when the collecting agent is used in the low-temperature environment of 0-15 DEG C, and the failure problem caused by low-temperature solidification or layering is fundamentally avoided.

The invention discloses a TS-1 molecular sieve catalyst, a preparation method and application of the TS-1 molecular sieve catalyst in preparation of an epoxy compound through epoxidation of hydrogen peroxide and alkene, the preparation method comprises the following steps: mixing a template agent with water, and then adding a silicon source to obtain a first solution; mixing a titanium source, soluble vanadium salt and isopropanol to obtain a second solution; stirring and mixing the first solution and the second solution, then adding octadecylamine polyoxyethylene ether biquaternary ammonium salt to obtain a reaction system, and then performing crystallization, separation and heat treatment to obtain the TS-1 molecular sieve catalyst. Through doping of vanadium heteroatoms and adjustment of octadecylamine polyoxyethylene ether biquaternary ammonium salt on a crystallization process, a hierarchical pore system is successfully constructed while high-activity titanium species are retained, and collaborative optimization of a pore structure and active sites is realized. The TS-1 molecular sieve catalyst obtained through optimization shows significantly enhanced catalytic activity and selectivity in an olefin epoxidation reaction system.

The present invention relates to a liquid cleansing composition. Particularly, the present invention relates to a liquid cleansing composition that provides improved deposition of an active, an octadecanoic acid, when applied on to a surface. The composition comprises an octadecanoic acid and an organic acid with pKa from 2.5 to 4.9 wherein the organic acid is other than the octadecanoic acid.

The application discloses a separation and detection method of methoxy PEG derivatives and methylsulfonyl PEG derivatives, which comprises the following steps: mixing a sample to be detected, ammonia and an ammonium salt catalyst, carrying out a derivatization reaction to obtain a derivative product, and detecting the derivative product by using a liquid chromatography method. The sample to be detected is a methoxy PEG derivative or a methylsulfonyl PEG derivative sample. In the method, the stationary phase of the chromatographic column is octadecylsilane bonded silica gel, the mobile phase A is a 0.01-5% formic acid aqueous solution in terms of volume percentage concentration, the mobile phase B is acetonitrile and methanol in a volume ratio of (1-5):1, a gradient elution program is adopted, and an electrospray detector is used. The method can effectively separate and quantitatively analyze the methoxy PEG derivatives and the methylsulfonyl PEG derivatives, and the method is completely in line with the standards and performs well in the quantitative limit, the linear range, the accuracy and the like, thereby providing an effective guarantee for subsequent product quality control or evaluation.

The invention discloses a specific luring composition for female adult tomato leaf miner as well as preparation and application thereof, and relates to the technical field of agricultural pest control, the active ingredients of the luring composition comprise limonene, terpinene, E-beta-caryophyllene and octadecane, and the weight ratio of the limonene to the terpinene to the E-beta-caryophyllene to the octadecane is 5: 3: 2: (1-5). The invention also provides a preparation method of the composition, which comprises the following steps: diluting the components with a solvent, mixing according to a ratio, and loading on a slow-release carrier such as a natural desulfurized rubber plug to prepare the lure. The trapping composition shows strong specific trapping activity to female adult tomato leaf miners, can be effectively used for trapping, monitoring and green prevention and control of female insects in the field, and has the advantages of being specific in effect, environmentally friendly, easy and convenient to prepare and the like.