1248 results about "Octadecane" patented technology

The invention relates to an emulsified metal antirusting agent and a preparation method thereof. The antirusting agent comprises the components by weight percentage of 2-2.5% of dicarboxylic acid, 6-6.5% of triethanolamine, 1-1.5% of monoethanolamine, 5-6.5% of synthesized borate, 8-10% of dodecenylbutadioic acid, 4.5-6% of octadecane oeoyl sarcosine acid, 0.1% of benzotriazole and 66.9-73.4% of water. The preparation method comprises the following steps of: firstly preparing a water-base antirusting agent; subsequently adding the octadecane oeoyl sarcosine acid, the synthesized borate and thedodecenylbutadioic acid in a reaction kettle; and mixing the solution, thus obtaining the emulsified antirust product. The method utilizes the strong adsorption function between the antirusting agentand the metal, displaces the residual oil dirt out of the surface of the metal, leads the surface of the metal to be adsorbed by a hydrophobic protective film; no oil dirt is remained on the surfaceof the metal that is processed by the antirusting agent, and the surface of the metal is not easy to be polluted by the dust; the antirusting agent can be used directly; furthermore, the components contains no nitrite, thus being safe and environment-friendly for use.

The invention provides a preparation method of modified superfine calcium carbonate powder. The preparation method comprises following steps: raw material mixing, slurry preparation, wet grinding, drying collection, depolymerization scattering and modified treatment, wherein a dispersing agent at least comprises ammonium polyacrylate salt, sodium hexametaphosphate and sodium polyacrylate salt; a modifying agent comprises one or more of octadecylamine, polymethyl methacrylate, a titanate coupling agent and a silane coupling agent; and a hyperdispersant comprises one or more of a polyester type hyperdispersant, a polyether type hyperdispersant, a polyacrylate hyperdispersant and a polyolefin hyperdispersant. By virtue of the preparation method, the dispersity of the powder can be improved, the dry-wet cover effects of building coatings can be improved, and the addition amount of titanium dioxide can be reduced.

The invention discloses a phase change micro-capsule for clothing thermoregulation as well as a preparation method and application thereof. The phase change micro-capsule for clothing thermoregulation comprises a core material and a wall material, wherein the core material is a mixture of n-octadecane and n-hexadecane, and the molar ratio between n-octadecane and n-hexadecane is (3 : 1)-(24 : 1); the wall material is methyl methacrylate; the phase change micro-capsule is applied to preparation of a clothing thermoregulation material. The phase change micro-capsule is stable in performance, non-toxic, non-corrosive and low in cost, can not cause super-cooling and super-heating phenomenon in use, has a melting and solidification temperature range just in the temperature range in which a human body can feel comfortable, is uniform in particle size distribution and appropriate in melting heat and solidification heat, meets the flexibility of finished fabrics in a later period, has a relatively large heat storage effect, and is suitable for performing thermoregulation on clothing.

The invention discloses an n-octadecane phase change micro-emulsion. The micro-emulsion comprises water and the following components in mass fraction: 5-40% of n-octadecane, 2-20% of surfactant, 0-20% of fatty alcohols and 0-3% of inorganic salts. The preparation method comprises the following steps of: firstly mixing n-octadecane, the surfactant, fatty alcohol and the inorganic salts according to the ratio of the mass fraction, then adding the remained water at 30-40 DEG C, stirring uniformly and standing to obtain the n-octadecane phase change micro-emulsion. The n-octadecane phase change micro-emulsion can be applied to a microelectronic system thermal management, and is used for micro-channel efficient heat dissipation cooling working medium in a thermal management system. The micro-emulsion and the application thereof have the advantages of high latent heat of phase change, wide applicable temperature range, good stability and the like.

The invention discloses cation water-based nano silicon dioxide and preparation method and application thereof. When in preparation, water, octadecyl dimethyl benzyl ammonium chloride and concentrated hydrochloric acid are added into a reactor to be stirred and dissolved; nano silicon dioxide micro powder is added into the reactor, stirring is carried out, so as to obtain low viscosity semi-transparent solution, and aminosilane coupling agent is dropwise added into the reactor while stirring; the pH value of the solution is regulated to 3-4, and the solution is continuously stirred, so as to obtain semi-transparent cation water-based nano silicon dioxide. The invention provides a cation surfactant and an aminosilane coupling agent into water phase, the surface characteristic of nano silicon dioxide and rheological property of dispersion are effectively improved, a nano silicon dioxide water-based dispersion with low viscosity, high stability and high uniformity is obtained, and further a high light waterproof coating slurry can be prepared.

The invention discloses a safety urea resin micro-capsule and a preparation method of the safety urea resin micro-capsule. The safety urea resin micro-capsule is prepared by carrying out in-situ polymerization on an organic phase change material functioning as a core material and urea resin functioning as a wall material, wherein the urea resin functioning as the wall material is obtained by subjecting formaldehyde and ureophil at the molar ratio of 1:1.4-1.6 to condensation polymerization; the organic phase change material functioning as the core material is one or more of liquid paraffin, hexadecane, n-octadecane and solid paraffin, and based on the ratio of the mass of the core material, namely the organic phase change material, to the total mass of the formaldehyde and ureophil in the wall material, the ratio of the core material to the wall material is 1.2-1.5:1. On the basis of ensuring the uniform particle size and high enveloping ratio of the safety urea resin micro-capsule disclosed by the invention, the content of the formaldehyde meets E1 of the European Norm (EN) standard, namely, the content of the formaldehyde in the micro-capsule is less than 10mg/100g.

The invention relates to a control method of the fingerprint spectrum quality of cordyceps sinensis powder raw material in botanical drug for strengthening vital qi and removing blood stasis, comprising the steps that: (1) cordyceps sinensis powder is extracted: 0.100g of cordyceps sinensis powder is taken, purified water is added, the ultrasonic extraction, the filtration and the sample injection are carried out; (2) the gradient elution with mobile phase is carried out: octadecyl silane bonded silica gel is taken as a filler, water and acetonitrile are taken as mobile phase to carry out the gradient elution for 0 to 30min and 0 to 7 percent B; (3) a standard fingerprint spectrum is established: the HPLC standard fingerprint spectrum of the cordyceps sinensis powder is determined, and 3 characteristic peaks are selected; (4) the quality control of the fingerprint spectrum is carried out: the relative retention time of No.2 peak uridine, No.3 peak guanosine and No.4 peak adenosine are 0.44 plus or minus 0.03, 0.68 plus or minus 0.03 and 1.00 respectively; the HPLC fingerprint spectrum of the sample is compared with the contrast fingerprint spectrum. The similarity calculated by the 5 common peaks is not less than 0.9, (5) the preparation of the cordyceps sinensis powder raw material is carried out; the control method has good repetitivity and can fully reflect the basic characteristics of nucleoside ingredients of the cordyceps sinensis powder.

The invention provides a method for purifying teriparatide acetate, comprising the following steps: dissolving crude peptide by using the aqueous solution of 10-30% of acetic acid and 5-20% of acetonitrile in volume ratio; carrying out gradient elution and purification on a crude peptide solution; adjusting the pH value of the aqueous solution of 0.1-0.4% of sulfuric acid and 0.1-0.4% of acetic acid in volume ratio by using ammonia water to be 5.0-6.0; obtaining the solution as phase A and acetonitrile as phase B; eluting when the gradient of the phase B is 20-40%; salting out; washing by using an ammonium acetate solution containing 3-10% of acetonitrile; converting acetate by using the high performance liquid chromatography of the octadecylsilane chemically bonded silica gel; and eluting an acetic acid aqueous solution acetonitrile system. The invention aims to provide a method for purifying the teriparatide acetate, which is simple in operation, high in yield and purity, and favorably realizes industrialization.

The invention provides a method for detecting related substances of ibuprofen or its sodium salt and preparation. The related substances comprise impurities A, B, C, D, E and F. The method comprises (1) preparation of a test sample solution: taking an appropriate amount of ibuprofen or ibuprofen sodium raw materials, putting the materials into a certain volume of a container, dissolving the materials, diluting the solution until a desired volume marked by a scale, shaking the solution, and filtering the solution to obtain a certain concentration of the test sample solution, and (2) sample detection: pouring the test sample solution into a chromatographic instrument, and acquiring a chromatogram map of the related substances separated effectively under chromatographic conditions of use of a chromatographic column containing octadecyl silane chemically bonded silica as a filler having size of 250*4.6mm and pore sizes of 5 micrometers and having a column temperature of 20 to 40 DEG C, use of a mobile phase having a volume ratio of organic phase acetonitrile to a water phase phosphoric acid aqueous solution of 32% to 48% and phosphoric acid content of 0.01 to 0.1% in the phosphoric acid aqueous solution, a flowing rate of 1.0 to 2.3 ml/min, and a detection wavelength of 205 to 225nm. The method can realize effective separation of a variety of impurities.

The invention provides a method for separating and measuring acetylcysteine enantiomers. In the method, before acetylcysteine is added in a chromatographic column, a derivatization reagent is used to perform derivatization, wherein the derivatization reagent is N(alpha)-(5-fluoro-2,4-dinitrophenyl)-L-amino acid compound. The method for separation and measurement combines the high performance liquid chromatography (HPLC) or high performance liquid chromatography-mass spectrum (HPLC-MS), and the used chromatographic column uses octadecylsilane chemically bonded silica as filler. The method for separation and measurement comprises the following steps: (1) taking acetylcysteine or a preparation with acetylcysteine, dissolving in low-concentration acid solution, adjusting the pH value of the mixed solution to 6.0-8.0 with alkaline solution to obtain a sample solution for testing; (2) mixing the acetylcysteine solution with 1mol/L of carbonate solution, adding N(alpha)-(5-fluoro-2,4-dinitrophenyl)-L-amino acid compound to mix evenly; (3) reacting the solution obtained by the step (2) at 40-60 DEG C in a dark place, adding hydrochloric acid solution after the reaction; (4) adding the solution obtained by the step (3) in a drying solution with the prestored phosphorus pentoxide and potassium hydroxide, adding phosphate buffer solution-acetonitrile, dissolving residues through ultrasonic treatment, filtering to obtain filtrate which is used as a testing solution; and (5) adopting HPLC or HPLC-MS to separate and measure the testing solution prepared by the step (4).

The invention discloses a boron nitride/graphene double-heat-conduction-base aerogel composite phase change material. The material is formed by compounding modified boron nitride/graphene aerogel andn-octadecane by adopting a vacuum impregnation method. The double-heat-conduction aerogel is prepared by taking graphene oxide, modified boron nitride, polyvinylpyrrolidone and ethylenediamine as rawmaterials to prepare boron nitride/graphene hydrogel, freeze-drying the boron nitride/graphene hydrogel and then calcining the boron nitride/graphene hydrogel at a constant temperature. Polyvinylpyrrolidone is used as a cross-linking agent, and ethylenediamine is used as a reducing agent. A preparation method of the composite phase change material comprises the following steps: 1) preparing modified boron nitride; 2) preparing boron nitride/graphene double-heat-conduction-base aerogel; and 3) preparing the boron nitride/graphene double-heat-conduction-base aerogel composite phase change material. When the material is applied as a phase change material, the heat conductivity coefficient is 0.9-1.6 W/(m.K); wherein the phase change temperature is 19-32 DEG C, and the phase change latent heatis 200-220 J/g. The composite phase change material has the following advantages: 1, the heat conductivity coefficient is improved by 738%; 2, the leakage problem in the phase change process is effectively solved; and 3, the phase-change latent heat and the heat stability are high;

The invention relates to an environment-friendly emulsion modified acrylate pigment dyeing adhesive and a manufacturing method of the environment-friendly emulsion modified acrylate pigment dyeing adhesive. Through improvement of additive order and relavent process parameters of materials such as a combination of methyl methacrylate, methyl acrylate, ethyl acrylate, glycidyl acrylate and acrylic acid, linear block polyether octodecane amino ternary polymerization modified silicon oil, emulsifier and the like, the environment-friendly emulsion modified acrylate pigment dyeing adhesive and the manufacturing method aim at solving the long-term technical problems that fabric feels hard, crockfastness is poor, rubbing fastness is low, hardness of dyed fabric is higher, adhesive force is low and environment is polluted, so as to realize the beneficial technical effects of good crockfastness, high rubbing fastness, soft feeling on dyed fabric, good hydrophily of the dyed fabric, better adhesive force and environment-friendly production process.

The present invention provides fully renewable turbine and diesel fuels derived completely from biomass sources. In one embodiment the fully renewable turbine fuel is comprised of mesitylene and at least one alkane. Preferably, the turbine fuel comprises from about 50 to 99 wt % mesitylene and from about 1 to 50 wt % of at least one alkane. In another embodiment the diesel fuel comprises mesitylene, octadecane, and optionally octane or nonane. Preferably, the diesel fuel comprises from about 50 to 99 wt % mesitylene, and from about 1 to 50 wt % octadecane. These biomass derived fuels may be formulated to have a wide range of cetane values and differing freezing and boiling points.

A heat accumulation phase-change material solves the problem that core materials are easy to leak after being absorbed by porous mass and is used for the fields such as warming, heat preservation, etc. The heat accumulation phase-change material comprises diatomite, expansive soil or expansion graphite, lauxite and core material which is paraffin, octadecane or cetane. A method for manufacturing the heat accumulation phase-change material comprises: step 1, carbamide is dissolved in water or absolute ethyl alcohol; step 2, the obtained solution is added with the core material and Tween-20 to be evenly stirred; step 3, the diatomite and the expansive soil or the expansion graphite are added into the mixed solution to be distilled and stirred until the absolute ethyl alcohol or the water is completely evaporated; step 4, when the temperature is lowered by 1-10 DEG C under the melting point of the core material, the obtained mixture is added with formaldehyde solution with the mass percentage being 37% and water having the mass being 5 times heavier than that of diatomite and expansive soil or the expansion graphite; step 5, the pH value is adjusted to be 3-4, and the reactants react for 3h and are processed by suction filtration, water rinse and desiccation; finally, the heat accumulation phase-change material is obtained.

The invention discloses a hydrophobic associated polymer modified magnetic nano-thickener and a preparation method thereof. The hydrophobic associated polymer modified magnetic nano-thickener is a core-shell structured nanocomposite prepared by taking nanometer Fe3O4 as the core, modifying the Fe3O4 through oleic surfactants and grafting an amphiphilic high-polymer compound, wherein the amphiphilic high-polymer compound is a hydrophobic associated water-soluble ternary polymer prepared by copolymerizing a water-soluble monomer, a heat-resistant and anti-salt monomer and a hydrophobic monomer,the water-soluble monomer is acrylamide, the heat-resistant and anti-salt monomer is 2-acrylamide-2-methylpropanesulfonic acid, and the hydrophobic monomer is styrene, n-octyl acrylate or octadecyl dimethyl allyl ammonium chloride. The hydrophobic associated polymer modified magnetic nano-thickener helps solve the problems of high cost and poor thickening performance of nano-thickeners and reutilization difficulty of polymer thickeners and is an efficient thickening and recycling integrated nano-thickener obtained by modifying low-toxicity magnetic nanometer materials and amphiphilic high-polymers; the preparation method of the hydrophobic associated polymer modified magnetic nano-thickener has no need for high-temperature and high-pressure reaction conditions and helps reduce the operation difficulty and the production cost.

The invention discloses a preparation method of a carbamide resin phase change microcapsule, and belongs to the field of preparation of textile materials. The method is characterized by comprising thefollowing steps: dissolving n-octadecane and TDI in a cyclohexane solvent, so as to form a uniformly mixed oil phase system; weighing an emulgator and OP-10, feeding the emulgator and OP-10 into a flask containing distilled water, and stirring, so as to form a uniformly mixed aqueous phase system; pouring the oil phase into an aqueous phase flask, and stirring with a homogenizer, so as to form uniform O/W emulsion; transferring the emulsion into a three-mouth flask, and reducing the rotate speed; uniformly mixing DETA and distilled water, dropwise adding the DETA and distilled water into theemulsion at a constant speed, and slowly performing temperature reaction after dropwise adding is accomplished, so as to obtain microcapsule suspension; performing suction filtration on an obtained product, washing the obtained product through distilled water and alcohol, performing suction filtration, and finally drying an obtained filter cake in a vacuum drying oven, so as to obtain a n-octadecane/carbamide resin phase change microcapsule. The carbamide resin/n-octadecane phase change microcapsule has the advantages that the enthalpy value of the microcapsule is 95.81 J/g, the packaging efficiency is 92.13 percent, and the thermal stability of the microcapsule taking carbamide resin as a wall material is excellent.

The invention belongs to the field of analytical chemistry, and discloses a method for separating and determining rivaroxaban related substances and the content thereof through liquid chromatography. The method is characterized in that the content of rivaroxaban and related substances thereof can be quantitatively determined through using a chromatographic column with octadecylsilane chemically bonded silica as a packing material and using a certain ratio of buffer salt solution-organic phase as a mobile phase, so the quality of rivaroxaban can be effectively controlled. The method has the advantages of strong specificity, high accuracy and simple operation.

The invention discloses a purification method of melanotan II, which mainly solves technical problem of chromatographic column damage caused by strong alkalinity. The purification method comprises the following steps: 1) filtering a melanotan II crude product solution through a 0.45-mu m filter membrane, carrying out gradient elution purification by using a polymer-based filler chromatographic column, a mobile-phase trifluoroacetic acid water solution as a phase A, an acetonitrile trifluoroacetate solution as a phase B, and collecting a peptide solution of primary target peak; 2) carrying out gradient elution purification on the primarily collected peptide solution through a reversed phase silica gel column by using octadecyl bonded silica gel as a stationary phase, a mobile-phase trifluoroacetic acid water solution as a phase A and an acetonitrile trifluoroacetate solution as a phase B, and collecting the peptide solution of target peak; 3) exchanging into acetate by an HPLC (high performance liquid chromatography) salt conversion process; and 4) carrying out rotary evaporation concentration on the final high-purity peptide solution under reduced pressure, and carrying out freeze-drying to obtain the powdery finished peptide product. The purification method disclosed by the method has the advantages of high purity and high yield, sufficiently protects the chromatographic column, lowers the cost, and is convenient for industrialized implementation.