61 results about "N-tetradecane" patented technology

Gel including a phase-change material and a gelling agent. In one embodiment, the phase-change material may be n-tetradecane, n-hexadecane or mixtures thereof. The gelling agent may be a high molecular weight styrene-ethylene-butylene-styrene (SEBS) triblock copolymer with a styrene:rubber ratio of about 30:70 to 33:67% by weight. To form the gel, the phase-change material and the gelling agent may be mixed at an elevated temperature relative to room temperature to partially, but not completely, dissolve the gelling agent. The mixture may then be cooled to room temperature. Alternatively, the phase-change material and the gelling agent may be mixed at room temperature, and the mixture may then be heated to form a viscoelastic liquid, which is then cooled to room temperature. The invention is also directed at a method of preparing the gel, a thermal exchange implement including the gel, and a method of preparing the thermal exchange implement.

Gel including a phase-change material and a gelling agent. In one embodiment, the phase-change material may be n-tetradecane, and the gelling agent may be a styrene-ethylene-butylene-styrene (SEBS) triblock copolymer. In particular, the SEBS copolymer may be a high molecular weight SEBS copolymer with a styrene:rubber ratio of about 30:70 to 33:67% by weight. The SEBS copolymer may constitute up to about 10%, by weight, of the gel, preferably less than 6%, by weight, of the gel, with n-tetradecane constituting the remainder. To form the gel, the phase-change material and the gelling agent are mixed together at an elevated temperature relative to room temperature to partially, but not completely, dissolve the gelling agent, i.e., a homogeneous solution is not formed. The mixture is then allowed to cool to room temperature. The invention is also directed at a method of preparing the gel and a thermal exchange implement including the gel.

The invention discloses a low-temperature phase change material used in drug cold-chain transportation. The low-temperature phase change material is prepared by mixing the following components in percentage by weight: 88.5-91.8% of n-tetradecane, 4-5% of n-dodecane, 2-3% of n-tridecane, 2-3% of n-pentadecane, and 0.2-0.5% of iso-tetradecane. According to the material, the melting point is 2-3 DEGC, so that the drug temperature can be kept within the valid range of 0-5 DEG C during transportation; in addition, the melting enthalpy of the material is high; the degree of supercooling is low; andthe circulating stability is high.

The invention discloses a constant-temperature double-layer natural essential oil bacteriostatic agent prepared from the following components: a natural essential oil, beta-cyclodextrin, urea, formaldehyde, melamine, Span-80, Twain-80, n-tetradecane, polyvinyl alcohol, a sodium chloride solution and deionized water. The invention also provides a preparation method of the bacteriostatic agent. The preparation method comprises the steps: by adopting in situ polymerization, the surface of the low-temperature organic phase-change material n-tetradecane is wrapped with a urea formaldehyde resin obtained by carrying out a condensation polymerization reaction of urea and formaldehyde, and thus an inner-layer modified urea formaldehyde resin low-temperature organic phase-change microcapsule is obtained; then the natural essential oil is adsorbed on the wall of the inner-layer modified urea formaldehyde resin low-temperature organic phase-change microcapsule, an outer layer is wrapped with beta-cyclodextrin as raw material, and thus the constant-temperature double-layer natural essential oil bacteriostatic agent is obtained. The constant-temperature double-layer natural essential oil bacteriostatic agent overcomes application limitations of the natural essential oil and the low-temperature organic phase-change material, improves the utilization rate of the natural essential oil, also has the microcapsule characteristic of slow release, and expands the application fields of the natural essential oil and the low-temperature organic phase-change material.

The invention relates to a modified urea resin low-temperature phase change microcapsule and a preparation method thereof. The modified urea resin low-temperature phase change microcapsule takes n-tetradecane as an internal core material, the surface of the n-tetradecane is wrapped with a urea resin as an outer-layer wall material by using an in-situ polymerization method, the urea resin is prepared by taking urea and formaldehyde as raw materials and melamine and polyving alcohol as modifying agents through polycondensation reaction, and the modified urea resin low-temperature phase change microcapsule is prepared from the following components in parts by weight: 4-10 parts of urea, 10-20 parts of formaldehyde, 2-5 parts of melamine, 0.2-0.8 part of span-80, 0.2-0.8 part of tween-80, 15-35 parts of n-tetradecane, 0.2-0.8 part of polyving alcohol and 5-20 parts of sodium chloride water solution of which the mass percentage concentration is 10%. The modified urea resin low-temperature phase change microcapsule is safe and non-toxic, energy-saving and environment-friendly, high in heat conduction efficiency and high in thermal stability, and the application field of a low-temperature organic phase change material is widened.

The invention discloses a novel reticulate structure capsule wall microcapsule phase-change material. The novel reticulate structure capsule wall microcapsule phase-change material comprises a capsule core material and an external capsule wall. The core material is a fatty hydrocarbon or fatty acid ester compound, preferably n-tetradecane, n-octadecane or butyl stearate, the shell layer adopts a reticulate structure, and the capsule wall is a polyurethane high polymer with a reticulate structure capsule wall and is formed by polymerizing diisocyanate and polyamine compounds as well as polyol compounds. The problems that the capsule wall of the microcapsule prepared through reaction of polyisocyanate and polyamine compounds has high permeability, low stability and low compactness and cannot prevent leakage of the core material well are solved. The invention also discloses a preparation method of the phase-change material. The preparation method particularly comprises the following steps: 1, weighing a capsule core component and polyisocyanate, and mixing to form a first solution; 2, preparing an emulsified liquid; 3, performing mixed reaction on the solutions prepared in the step 1 and step 2; 4, adding a water-soluble reaction monomer; 5, continuously performing temperature-increasing reaction obtained through preparation.

The invention discloses a method for cross distillation separation of C13-16 n-alkanes in liquid wax oil. In the method, decompression lateral line rectifying, decompression lateral line lifting rectifying and decompression rectifying are combined for extracting n-tridecane, n-tetradecane, n-pentdecne and n-cetane from the liquid wax oil. Compared with the prior art, the method disclosed by the invention has the advantages that the process is continuously operated, the content and yield of the separated n-tridecane, n-tetradecane, n-pentdecne and n-cetane are all above 99.5% and the energy consumption is at least 8.5% lower than that of the traditional repeated decompression rectifying.

A calosoma maximoviczi morawitz attractant is characterized by mainly prepared through mixing the following materials in percentage by weight: 20%-70% of beta-trans-ocimene, 10%-50% of alpha-farnesene, 1%-10% of linalool, 1%-10% of paraethyl acetophenone, 1%-10% of azulene, 1%-10% of cis-3-hexenyl-acetate, 1%-10% of cis-3-hexenyl-1-alcohol, 1%-10% of n-tetradecane, 1%-10% of n-pentdecne and 1%-10% of n-heneicosane. The calosoma maximoviczi morawitz attractant and a lure core are high in sensitivity, free of environment pollution and low in cost, thereby having higher popularization and application values and displaying higher trapping activity in the field.

The invention discloses a synthetic method of ZSM-5 molecular sieve containing phosphorus in crystal. The method comprises the following steps: (1) quaternary ammonium hydroxide and tetrabutylphosphonium hydroxide and an aluminium source are mixed, a mixture is treated in an enclosed reaction vessel for 0.1-5 hours at 50-190 DEG C and cooled, an intermediate product is obtained, and an aluminium source is an aluminium source without alkali metal ions; (2) the intermediate product in the step (1) and a silicon source and water are uniformly mixed in order to obtain a mixture; (3) the mixture in the step (2) is placed in the enclosed reaction vessel for hydrothermal crystallization and products are recycled. The synthesized ZSM-5 molecular sieve containing phosphorus in crystal can be used as an active component for catalysis of tetradecane with higher cracking conversion rate.

Gel including a phase-change material and a gelling agent. In one embodiment, the phase-change material may be n-tetradecane, n-hexadecane or mixtures thereof. The gelling agent may be a high molecular weight styrene-ethylene-butylene-styrene (SEBS) triblock copolymer with a styrene:rubber ratio of about 30:70 to 33:67% by weight. To form the gel, the phase-change material and the gelling agent may be mixed at an elevated temperature relative to room temperature to partially, but not completely, dissolve the gelling agent. The mixture may then be cooled to room temperature. Alternatively, the phase-change material and the gelling agent may be mixed at room temperature, and the mixture may then be heated to form a viscoelastic liquid, which is then cooled to room temperature. The invention is also directed at a method of preparing the gel, a thermal exchange implement including the gel, and a method of preparing the thermal exchange implement.

The present invention provides a substrate holding method capable of contributing to improvement in performance of an electronic part. A plastic film is adhered to a holding frame by using an adhesive tape having a proper gas releasing characteristic such that total quantity of gas detected when analysis using gas chromatograph mass spectrometry (dynamic HS-GC-MS) is conducted under test conditions of 180° C. and 10 minutes is 100.5 μg / g or less in n-tetradecane. In the case where the plastic film held by the holding frame is subjected to a process of manufacturing an electronic part (for example, a solar battery), even when a process accompanying generation of heat during the manufacturing process (for example, a film forming process such as plasma CVD) is performed on the plastic film, a release amount of unnecessary gas released from the adhesive tape due to the influence of the heat is suppressed, so that deterioration in the performance of the electronic part caused by the unnecessary gas is suppressed.

The invention relates to a method of preparing n-tetradecane or n-hexadecane from natural acid. According to the invention, the natural acid and a solvent are mixed and then undergo a hydrogenation reaction in the presence of a catalyst and hydrogen, wherein the catalyst is a palladium / carbon nanotube catalyst, reaction pressure of the hydrogenation reaction is 1 to 10 MPa, reaction temperature is 220 to 320 DEG C, reaction time is 3 to 10 h, the catalyst uses a multi-walled carbon nanotube as a carrier and 2 to 10% by mass of palladium as an active component, and the solvent is one selected from the group consisting of hexane, n-heptane, n-octane and dodecane. Compared with the prior art, the method provided by the invention has the advantages of simple preparation technology, a low reaction temperature, a small usage amount of the solvent, high reaction activity and high yield of a target product.

The invention relates to a method for preparing a temperature regulating agent using tetradecane / tetradecanol / melamine-modified urea formaldehyde resin as a temperature control material. The method comprises mixing n-tetradecane and tetradecanol at a certain ratio, coating the mixture with melamine / urea / formaldehyde resin through an appropriate emulsifier to obtain microcapsules, and re-coating the microcapsules with a high temperature-resistant phenolic-modified epoxy resin to obtain a temperature self-regulating material for asphalt. The microcapsules have the maximum endothermic value of 112.7 J / g at 4.5 DEG C. The asphalt temperature self-regulating material containing 30% by mass of the microcapsules has the maximum endothermic value of 23.62 J / g at 5.58 DEG C. The temperature regulating agent utilizes recyclable production resources, has a low waste rate and a certain mechanical performances, replaces a part of aggregates in asphalt and has a proper temperature adjustment interval. The method has the advantages of simple processes, low cost, environmental friendliness and wide application prospect.

A soldering method, which secures reliable joints without using flux, is disclosed. Soldering is performed using an auxiliary connecting material capable of physically destroying and dispersing an oxide film, which is naturally grown on the surface of a main connecting material such as solder or brazing between two terminals, to realize a reliable solder wetting (a state of the main connecting material being fused and mixed). For an auxiliary connecting material, hydrocarbon such as n-tetradecane (C14H30), for example, can be used. N-tetradecane boils between connection surfaces and cubically expands; energy generated therefrom physically disperses the oxide film and causes a fresh surface to be exposed; solders on both terminals are mixed; and an electrical and mechanical joint is securely achieved. The residue of the auxiliary connecting material is an insulating material, and therefore does not need cleaning. An excellent electrical joint which is moisture-resistant as well as highly reliable is attained.

The invention relates to the technical field of cleaning agents, particularly to an efficient anti-rust environmentally-friendly hydrocarbon cleaning agent and a preparation method thereof, wherein the efficient anti-rust environmentally-friendly hydrocarbon cleaning agent comprises, by mass, 40-50% of n-tetradecane, 30-40% of n-hexadecane, 9-29% of n-pentadecane, 0.4-0.8% of dioctylamine, and 0.2-0.6% of a RP333H hard film rust inhibitor. According to the present invention, with the efficient anti-rust environmentally-friendly hydrocarbon cleaning agent and the preparation method thereof, theanti-rust performance is increased under the premise of the ensuring of the original performances of the hydrocarbon cleaning agent so as to substantially improve the working efficiency of the production enterprise, the problems of cleaning and rust prevention can be simultaneously solved with the same product, and the difficult problem that different processes must adopt different products is solved.

The invention discloses a preparation method of phase-change emulsion for liquid-cooling garments. The preparation method comprises the following steps that (1) by weight, 10-20 parts of polyving akohol molten in a heated mode and 20-30 parts of an emulsifying agent are mixed and stirred evenly, and a system A is obtained; (2) by weight, 10-20 parts of n-tetradecane, 40-80 parts of n-octadecane and 100-200 parts of distilled water are added into another glass container and stirred at the same time, and a system B is obtained; and (3) the system A is dropwise added into the system B, then 6-10 parts of butyl stearate by weight is added, stirring and emulsifying are conducted, and the phase-change emulsion is obtained. The phase-change emulsion prepared according to the preparation method is relatively lower in viscosity, has the resistance reducing characteristic, and is not prone to blocking a pipeline, and the pump consumption is reduced.

The invention discloses a new compound and application to inhibit the growth of bacillus tubercle in the medical technical domain, whose chemical name is 1, 1, 14, 14-four (2, 6-dimethyl phenyl)-2, 13-dioxo-6, 9-diammonia-4, 11-dihydroxy n-tetradecane (MIC=6.25 mu g / mL).

The invention discloses anti-freezing lubricating oil. The oil comprises, by weight, 6-8 parts of n-hexane, 6-8 parts of n-heptane, 6-8 parts of n-octane, 4-6 parts of n-decane, 4-6 parts of n-dodecane, 4-6 parts of n-tetradecane, 2-4 parts of methylbenzene and 1-2 parts of anti-freezing agent. In this way, high-molecular alkane and aromatic hydrocarbon serve as basic solutions of the lubricating oil, the anti-freezing agent is added into the basic solutions, and then the function of reducing the freezing point is achieved, and the lubricating oil can be effectively prevented from being frozen in the cold outdoor. The formula is novel, the properties are stable, freezing is effectively prevented, and the lubricating oil is convenient to use and wide in application range and has wide market prospects in popularization.

The present invention provides a paraffin-based latent heat storage material composition that includes, as a main component, a mixture of n-hexadecane, n-pentadecane, and, optionally, n-tetradecane, in which 1) the mixture has the n-hexadecane content of 68 mass% or more, the n-pentadecane content of 1 mass% to 23 mass%, and the n-tetradecane content of 23 mass% or less, where the total sum of the n-hexadecane content, the n-pentadecane content, and the n-tetradecane content is 100 mass%, 2) the composition has a melting point lower than that of n-hexadecane, and 3) the composition has a latent heat of fusion of 200 J / g or more.

The invention relates to the field of drilling fluids, and discloses a phase change microcapsule, a preparation method thereof, an intelligent temperature control water-based drilling fluid and application. The phase-change microcapsule comprises a core material and a wall material coating the outer surface of the core material, wherein the wall material also contains an optional wall material enhancer; the core material is selected from one or more of n-tetradecane, dodecanol, decanol and caprylic acid; the wall material is urea resin and / or melamine- formaldehyde resin; and the wall materialenhancer is manganous-manganic oxide. The intelligent temperature control water-based drilling fluid can intelligently regulate and control the temperature of underground drilling fluid, and hydratedecomposition caused by temperature rise of the drilling fluid can be avoided.

The invention discloses a solid-solid phase change material as well as a preparation method and application thereof. The solid-solid phase change material disclosed by the invention is prepared from the following components in percentage by mass: 80-87% of n-tetradecane, 3.8%-5.8% of n-tridecane, and the balance of superfine 52-degree semi-refined paraffin, totaling 100%. The preparation method ofthe solid-solid phase change material comprises the following steps: mixing and heating the n-tetradecane and the n-tridecane, then adding the superfine 52-degree semi-refined paraffin wax, heating and stirring until the paraffin wax is dissolved to obtain a solution system, stopping stirring and preserving heat of the solution system, and then cooling the solution system to room temperature to obtain the solid-solid phase change material. The crystallization temperature of the solid-solid phase change material can meet the refrigeration temperature required by the blood storage environment.The material is stable in shape, the material cannot seep out of an outer package at high temperature when the material is prepared into a cold accumulation device by means of filling, the problem ofpossible pollution is avoided, and the material is safe to use, free of risk and long in service life.

The invention belongs to the technical field of quaternary ammonium salt compounds, and particularly relates to a degradable quaternary ammonium salt compound and a preparation method and applicationthereof, a structural general formula of the quaternary ammonium salt compound is shown as a formula I, in the formula I, R1 is H or CH3, R2 is any one of n-decane, n-dodecyl and n-tetradecyl, R3 is Oor NH, and R4 is CH3 or CH2CH3. The invention has the beneficial effects that the quaternary ammonium salt compound simulates a phospholipid structure on the surface of bacteria, presents local amphipathy, and can replace and insert phospholipid on the surface of a cell membrane of the bacteria to change the original cell membrane structure, so that the cell membrane of the bacteria is broken, bacterial cell contents flow out and cells die.

The invention discloses a double-component water-based long-acting anti-icing coating. The coating comprises a component A and a component B which are independently packaged and mixed according to a mass ratio of 25: (1-2) in use. The component A comprises the following raw materials in parts by weight: 90 to 100 parts of an organic silicon rubber emulsion with a solid content of 40 to 60 wt%, 5 to 10 parts of n-tetradecane, 15 to 20 parts of a filler, 0.5 to 1 part of a catalyst, 1 to 5 parts of a leveling agent, 0.2 to 0.4 part of a defoamer, 3 to 5 parts of sodium carbonate and 50 to 70 parts of water. The component B comprises the following raw materials in parts by weight: 20 to 40 parts of an organic silicon crosslinking agent, 10 to 30 parts of a silane coupling agent and 10 to 30 parts of slow-release silicone oil particles. According to the invention, silicone oil is loaded in a slow-release carrier, and controlled release and slow release of the silicone oil are realized through mixing of the two components, so the lasting time of the hydrophobic property of the coating is prolonged, and the coating is allowed to have long-acting anti-icing performance.

The invention relates to a method for preparing n-tetradecane, n-heptadecane and n-eicosane at one time, which comprises the following steps of: preparing raw materials comprising bromoalkane and sodium metal for later use; adding bromoalkane mixed liquid and the sodium metal into a reaction kettle, stirring the solution and heating the solution to 80 DEG C, maintaining the temperature between 120 and 140 DEG C, controlling the temperature to be 140 to 160 DEG C after the rest material is completely added, and keeping constant temperature for 2 hours; and adding ethanol and water into the solution in turn, separating out organic substances and washing the organic substances to be neutral by using water, drying the organic substances by using anhydrous magnesium sulfate, collecting fractions by distillation, and collecting n-tetradecane, n-heptadecane and n-eicosane finished products through water distillation columns according to different boiling points. A strong oxidant such as concentrated sulfuric acid or acid potassium permanganate used in the preparation method has oxidation effect on unsaturated organic substances and alcoholic impurities in the reactants and removes unsaturated hydrocarbons to achieve the effect of eliminating the impurities, the content of the normal alkanes reaches 96 to 98 percent, and the purity of the finished products is improved.

The invention provides an anti-leakage cold storage agent and a preparation method thereof, belonging to the technical field of phase-change cold storage materials. The anti-leakage cold storage agentis jelly-like, does not easily flow, is leak-proof, and has a phase-change temperature of 5.8-6.6 DEG C and phase change latent heat of about 152-168 KJ / Kg. The specific preparation process comprisesthe following steps: firstly, mixing a K2HPO4 aqueous solution with a polyethylene glycol aqueous solution, and then slowly dropwise adding n-tetradecane so as to form a mixed solution; finally, adding a mixed solution of a sodium carboxymethylcellulose aqueous solution and sodium dodecyl sulfate, and stirring to obtain the anti-leakage cold storage agent. The anti-leakage cold storage agent provided by the invention is convenient in preparation process and simple in technology, thus being suitable for large-scale preparation; furthermore, the phase change temperature of the cold storage agent is within a range of 5.8-6.6 DEG C, and the cold storage agent has the phase change latent heat of about 152-168 KJ / Kg, so that the cold storage agent can guarantee transported objects to be in a range of 2-8 DEG C for a certain period of time in a process of circulation on the basis of preventing leakage; therefore, the cold storage agent is suitable for the cold chain transportation industry of medicines such as vaccines.

The invention provides an anti-ice and anti-snow bridge floor temperature control method which comprises the steps that a pipe network for circulating underground water is laid above a concrete panel of a bridge floor, the pipe network for circulating underground water is arranged below an asphalt pavement layer, and the asphalt pavement layer contains a phase change material; the phase-change material comprises a mixture of n-tetradecane and n-octadecane, the dosage of the n-tetradecane in the mixture is greater than that of the n-octadecane, and the bridge floor temperature control method comprises the following steps: spontaneously controlling the temperature through heat release of the phase-change material in a slightly cold season without consuming external energy; in extremely cold seasons, underground water circulation and the phase-change materials act together to effectively inhibit icing, deicing of the bridge floor is achieved to a certain extent, and driving safety is improved. In addition, in hot seasons, flowing of underground water can effectively reduce the temperature of the pavement and reduce the generation of ruts on the asphalt pavement. In general, the method provided by the invention is good in effect, environment-friendly and low in cost.

The invention belongs to the technical field of beneficiation, and particularly relates to application of n-tetradecyl isopropanolamine as a collecting agent in scheelite flotation. According to the method, the collecting agent n-tetradecyl isopropanolamine is low in toxicity and free of pollution, strong electrostatic adsorption, hydrogen bond adsorption and physical adsorption exist between thecollecting agent n-tetradecyl isopropanolamine and scheelite, high selectivity is achieved for mixed ore of scheelite and gangue mineral calcite, the collecting agent n-tetradecyl isopropanolamine does not need to be compounded with other collecting agents, the using process is simple and convenient, and the agent system is simple. Test results show that the amine collecting agent n-tetradecyl isopropanolamine provided by the invention is used for scheelite mineral flotation collection, the scheelite recovery rate reaches 96.89%, the calcite recovery rate is only 8.68%, and the amine collecting agent n-tetradecyl isopropanolamine has the advantages of high selectivity, simple use process, simple reagent system and good flotation effect.