475 results about "Crystallization temperature" patented technology

The invention relates to the technical field of image data processing, in particular to a stevioside impurity detection method based on industrial vision, which comprises the following steps: placing a supersaturated solution in a crystallization container for cooling crystallization to obtain surface images of each detection area under different illumination angles so as to determine a gray level fluctuation coefficient of each detection area; screening a feature detection area, acquiring a surface image of the feature detection area at a feature acquisition illumination angle to identify a feature contour, acquiring feature contours at different crystallization temperatures, determining a contour growth coefficient, determining a risk tendency category of the feature contour, and determining a mode of performing impurity marking; according to the method, a high-risk region where impurities exist is rapidly identified, the impurity marking mode is adaptively adjusted according to different crystal contour features in the surface image of the stevioside crystal, and the stevioside impurity detection reliability and detection efficiency are improved.

The invention belongs to the technical field of catalyst carrier materials, and particularly relates to a preparation method of mesoporous ultra-stable aluminum oxide. Pseudo-boehmite is prepared by adopting a double-aluminum method, alumina powder is obtained after roasting, a layer of fibrous pseudo-boehmite is prepared in the pore structure of the alumina powder, and the pore structure and the specific surface area of mesoporous super-stable alumina are controlled by controlling the crystallization pH value and the crystallization temperature in the reaction process. Sodium silicate and hexamethyldisilazane are added in the preparation process, so that the high-temperature stability of the mesoporous super-stable aluminum oxide is effectively improved, and the mesoporous super-stable aluminum oxide still has good specific surface area and pore volume under a hydrothermal condition. The mesoporous stable alumina is prepared by taking sodium metaaluminate and aluminum sulfate as main raw materials, and an organic solvent is not added as a template agent in the preparation process, so that volatilization of the organic solvent is effectively avoided, and the mesoporous stable alumina is green and environment-friendly.

The invention provides amino acid cleansing cream and a preparation method thereof. The preparation method comprises the following steps: heating and stirring raw materials of the amino acid cleansing cream to a temperature T1; wherein T1 ranges from 80 DEG C to 85 DEG C; cooling and stirring to a crystallization temperature T2, and continuously stirring until the paste is pearlescent, namely reaching a discharging temperature T3; heating and stirring to a temperature T4, keeping the temperature and stirring for 20-40 minutes, and cooling and stirring to a discharging temperature T3, so as to obtain the amino acid cleansing cream. Wherein T2-5 DEG C < T4 < T2 + 5 DEG C, preferably T2-3 DEG C < = T4 < = T2 + 3 DEG C. The preparation method is simple in process and easy to implement, and the prepared amino acid cleansing cream can keep a cream body stable for a long time and is fine, smooth and soft in appearance.

This thermoforming device, which performs thermoforming of a continuously supplied resin sheet to simultaneously mold two or more rows of containers in the feed direction of the resin sheet, has: protruding linear portions of a leading clamp forming thin-walled portions in a direction perpendicular to the feed direction between the two rows of the containers; and protruding linear portions of an upper mold, wherein the protruding linear portions have a cooling means and do not raise the temperatures of the thin-walled portions to a crystallization temperature during heat set thermoforming.

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 preparation method of a neodymium-yttrium-iron-boron magnet with core-shell heterostructure crystal grains. The method comprises the following steps: preparing neodymium-yttrium-iron-boron rapid-quenching amorphous strips with different yttrium contents through a melting rapid-quenching technology; carrying out crystallization annealing on the amorphous rapid quenching belt at different temperatures, and preparing powder particles with the particle size of 2-5 microns through hydrogen demolishing and jet milling; and the neodymium-yttrium-iron-boron magnet with the core-shell heterostructure is prepared through high-temperature vacuum sintering after orientation forming and cold isostatic pressing of the neodymium-yttrium-iron-boron magnet in a magnetic field. According to the method, dynamic adjustment of distribution of yttrium in a crystal grain core-shell area is achieved by controlling the crystallization temperature of an amorphous rapid quenching zone, and therefore the coercive force of the magnet is improved.

The invention discloses a low-temperature phase change energy storage material and a preparation method thereof, and relates to the technical field of cold storage materials. The provided organic phase-change material is formed by jointly matching alkane and fatty alcohol, the melting temperature of the organic phase-change material is 0-10 DEG C, the crystallization temperature is-5-5 DEG C, and the melting temperature and the crystallization temperature can be adjusted according to requirements. The material has high latent heat of phase change, and can be efficiently used in scenes of cold chain transportation, refrigeration house energy conservation and the like. The material is non-toxic and harmless, has stable cycle performance, and effectively overcomes the defects of poor cycle performance, easy phase separation, large supercooling degree and the like of an inorganic material. The material is applied to cold storage energy conservation or cold chain transportation, and the effects of energy conservation, environmental protection and electric charge saving can be achieved by utilizing the valley electricity energy storage principle.

The present invention discloses a potassium-doped tungsten rod for high-flexibility tungsten wire ropes and its manufacturing method, belonging to the technical field of powders for metal additive manufacturing, which includes the following steps: (1) material selection - (2) pre-reduction - (3) vacuum spray doping - (4) reduction - (5) batch pickling - (6) mixing - (7) hard film cold isostatic pressing - (8) low-temperature impurity removal - (9) vertical melting pre-sintering - (10) intermediate-frequency sintering, finally obtaining a potassium-doped tungsten rod. Compared with the prior art, the present invention uses specially made potassium-doped tungsten powder with high activity and narrow particle size range to produce tungsten rods. Through the regulation of the narrow particle size range, during the sintering of the combination of vertical melting and intermediate frequency, the potassium-doped tungsten billet obtains stable and micro-nano-level initial crystallization; and after being processed into tungsten wire, the finished product rate reaches 88% - 90%, the qualified rate ≥ 95%, the tensile strength ≥ 2250 N / mm<supgt;2< / supgt;, the high-temperature recrystallization temperature is 1850 °C - 2380 °C, the high-temperature sag value of the 0.39 mm specification ≤ 1.5 mm, the aspect ratio ≥ 15, and the service life is extended.

The present invention addresses the problem of providing polypropylene-based foamed resin particles which contain a recycled polypropylene-based resin and with which it is possible to provide a polypropylene-based foamed resin molded body having excellent internal fusion properties. The polypropylene-based foamed resin particles contain a base material resin containing a non-recycled polypropylene-based resin and a specific amount of a recycled material that contains a recycled polypropylene-based resin. The crystallization temperature of the recycled material is higher than the crystallization temperature of the non-recycled polypropylene-based resin.

In order to obtain an electret melt blown nonwoven fabric having flexibility and high tensile elongation without performing a special post-processing treatment or using a special additive, the electret melt blown nonwoven fabric comprising polyolefin-based resin fibers is provided, the electret melt blown nonwoven fabric having a crystallization temperature of 80° C. or higher and 130° C. or lower and a heat quantity ΔHm of 3.0 J / g or higher and 20.0 J / g or lower at the time of the first temperature rise in the cycle of DSC.

The present invention belongs to the technical field of catalyst carrier materials, and specifically relates to a method for preparing mesoporous ultra-stable alumina. The present invention adopts a double aluminum method to prepare pseudo-boehmite, obtains alumina powder after calcination, and prepares a layer of fibrous pseudo-boehmite in the pore structure of the alumina powder. The pore structure and specific surface area of the mesoporous ultra-stable alumina are controlled by controlling the crystallization pH value and crystallization temperature during the reaction process, and sodium silicate and hexamethyldisilazane are added during the preparation process, which effectively improves the high-temperature stability of the mesoporous ultra-stable alumina, so that it still has good specific surface area and pore volume under hydrothermal conditions. The present invention uses sodium metaaluminate and aluminum sulfate as the main raw materials to prepare mesoporous stable alumina. No organic solvent is added as a template during the preparation process, which effectively avoids the volatilization of the organic solvent and is green and environmentally friendly.

The invention relates to the technical field of formaldehyde copolymer production, and discloses a trioxymethylene static crystallization separation method which comprises the following steps: S1, cooling crystallization: the crystallization temperature is 25-30 DEG C, and the crystallization time is 3-4 hours; s2, discharging mother liquor; s3, sweating, wherein the sweating temperature is 50-55 DEG C, and the sweating time is 2-2.5 h; and S4, melting to obtain a high-purity product. According to the invention, the characteristic that the solubility of trioxymethylene is reduced along with temperature reduction is utilized, and separation and purification are realized through temperature gradient regulation and control. The content of trioxymethylene in the prepared finished product reaches 94-96% and is higher than that in the prior art by 90-92%, the formaldehyde content is only 0.1-0.2%, and the impurity content is lower.

The invention relates to the technical field of composite adsorption material preparation, and discloses a salt lake lithium extraction titanium system composite adsorption resin preparation technology, which comprises: placing a macroporous organic resin matrix loaded with a titanium lithium source and maintaining a solvent saturation state in a closed reaction kettle, and carrying out a reaction under an inert gas and initial pressure atmosphere, according to the preparation method disclosed by the invention, the problem that a traditional powdery ion sieve is easy to break and lose is solved by utilizing the anti-wear characteristic of an organic resin framework; and meanwhile, an in-situ composite interface realized by the process inhibits pulverization attenuation of active components in circulation, and ensures long service life and structural integrity of the material.

Disclosed in the present invention is a preparation method for an anisotropic Nd2Fe14B / α-Fe bulk nanocrystalline composite permanent magnet material. The preparation method comprises the following steps: preparing a master alloy; crushing the master alloy into bulks, and, by means of a melt rapid quenching method, preparing amorphous ribbons; grinding the amorphous ribbons to obtain amorphous powder; cold-pressing the powder into bulks; and placing the bulks into a stainless steel mold, and heating and then rolling same, the stainless steel mold being of a plate-shaped structure, and a chamber for accommodating the bulks being formed in the stainless steel mold along the thickness direction thereof. The present invention presses the NdFeB amorphous powder into bulks, embeds same in the stainless steel mold, and performs rolling at a temperature below a crystallization temperature, so as to achieve high-temperature amorphous material crystallization.

A method for preparing a polybutene-1 composition with an elevated crystallization temperature, comprising blending as components A) 99.5-99.9% by weight, relative to the total weight of A)+B), of a butene-1 homopolymer, said butene-1 polymer being brought into or maintained in the molten state during the blending step, with B) 0.1-0.5% by weight, relative to the total weight of A)+B), of one or more alkanoyl hydrazines of specific formulas, the polybutene-1 composition thus obtained having a crystallization temperature T satisfying the following relationship: c C has. [0010] JPEG2024542582000029.jpg4092 Here, T c A is the crystallization temperature of butene-1 polymer A).

A method and apparatus for producing urea ammonium sulfate granules. In a first fluidized bed, a first spraying liquid is sprayed, the first spraying liquid comprising a urea melt and an aqueous ammonium sulfate solution, for example, a (near) eutectic mixture. The bed temperature is lower than the crystallization temperature of the sprayed mixture. In a next compartment, the granules are fluidized to form a second fluidized bed. A second spraying liquid comprising a urea melt is sprayed into the second fluidized bed, the second fluidized bed having a bed temperature higher than the bed temperature of the first fluidized bed and lower than the crystallization temperature of the sprayed second spraying liquid.

This invention discloses a method for preparing crystalline aluminum phosphate from aluminum polishing waste liquid, comprising the following steps: Step S1. Adding water and alkali to the aluminum polishing waste liquid, adjusting the pH to 2-5, to obtain a mixed solution; Step S2. Taking the mixed solution obtained in Step S1, filtering, to obtain an amorphous precipitate; Step S3. Taking the precipitate from Step S2, washing, to obtain a washed precipitate; Step S4. Adding water to the washed precipitate from Step S3 and transferring it to a hydrothermal reactor for crystallization, to obtain crude aluminum phosphate; Step S5. Taking the crude aluminum phosphate from Step S4, filtering, washing, and drying, to obtain crystalline aluminum phosphate; wherein, in Step S4, the crystallization temperature is 160-210℃, and the crystallization time is not less than 3 hours. This method is simple, easy to operate, and the reaction conditions are easy to control. It not only solves the environmental problems encountered in the chemical polishing process of aluminum materials, but also improves the industrial value of aluminum polishing waste liquid.

The present invention discloses a transition metal sulfide-doped single-element phase change memory material and a preparation method thereof, wherein the material is a MoS2-doped Sb thin film material, and the chemical structure of the thin film material is Sb x (MoS2) 100‑x , where 65at.%≤x≤85at.%, is obtained by dual-target sputtering of Sb single-element target and sulfur compound MoS2 target in a magnetron sputtering coating system. The advantage is that compared with GST phase change material, this phase change memory material has a higher crystallization temperature and a lower melting temperature, higher crystallization activation energy and ten-year data retention temperature, and greatly reduced resistance drift. In addition, the performance of single-element phase change Sb is successfully improved by doping with sulfur compounds, supporting the storage stability and reliability of phase change memory devices under long periods and high cycle numbers.

The present invention discloses titanium-based solder alloy particles, a preparation method thereof, and a titanium cup brazing process, comprising the following steps: preparing a metal alloy according to a mass fraction, preparing the metal alloy into a powder by argon atomization, and screening the powder with a particle size of less than 200 mesh; preparing an organic intermediate according to a mass fraction; mixing the powder with the organic intermediate according to a mass fraction, with the powder accounting for 89-94 and the organic intermediate accounting for 6-11, and extruding into a welding rod with a diameter of 2-3 mm after sufficient stirring; drying the welding rod at 80°C under vacuum for 12 hours; cutting the welding rod into 2-3 mm welding particles to obtain titanium-based solder alloy particles. Beneficial effects of the present invention: The present invention provides titanium-based solder alloy particles, a preparation method thereof, and a titanium cup brazing process, which increases the brazing temperature of traditional solder to 1050 degrees, and the brazing temperature matches the crystallization temperature of the titanium material, so that the crystallization of the titanium cup and vacuum brazing can be integrated, which can reduce processing time, improve product qualification rate, and reduce production cost.

The invention discloses a treatment technology for separating a sorbic acid isomerization product, and belongs to the field of chemical engineering. According to the method, water and ethanol in the eliminated mother liquor are separated through selective separation of the dehydration membrane, so that an ethanol solution with higher concentration is obtained, the concentrations of sorbic acid and isomers in the solution are increased, then the crystallization temperature is controlled by utilizing the solubility difference of the sorbic acid and the isomers in the alcohol, and the crystallization efficiency is improved. Sorbic acid containing a low isomerization product is separated and recovered, so that the quality of a finished product is effectively improved.

The application discloses a kind of preparation of thin-layer Ti-MWW titanium silicalite and its application in epoxidation reaction, belong to inorganic chemical synthesis technical field.The application adds polycyclic aliphatic amine in the synthesis process of Ti-MWW molecular sieve, and reduces the crystallization temperature in the early stage of molecular sieve crystallization to delay the growth rate of molecular sieve C axis, obtain shorter C axis thin-layer Ti-MWW, greatly improve the diffusion performance of Ti-MWW molecular sieve by this method, increase the diffusion rate of reactant molecules in channel, so that the catalytic performance of molecular sieve is greatly improved, suitable for catalyzing propylene, butylene, hexene, cyclohexene, octene liquid phase epoxidation and the like.

The application provides a method for preparing calcium sulfate hemihydrate whiskers by using a low water activity system, and belongs to the technical field of calcium sulfate hemihydrate whiskers. The method comprises the following steps: aging, washing and drying treatment are performed on phosphogypsum raw materials to obtain modified phosphogypsum; inorganic salt, alcohol for reducing water activity and deionized water are mixed to obtain a mixed solution; the mixed solution is heated to a crystallization temperature, and then the modified phosphogypsum and a polyhydroxy alcohol crystallization regulator are added to perform a crystallization reaction; after the crystallization reaction is completed, solid-liquid separation, washing and drying are performed to obtain calcium sulfate hemihydrate whiskers. The method has simple process conditions and a controllable crystallization process, and can stably prepare calcium sulfate hemihydrate whiskers with a high length-diameter ratio.

The invention belongs to the technical field of steel and iron smelting and material processing, and particularly discloses a peritectic steel casting blank surface longitudinal crack control method which specifically comprises the steps that firstly, the physical performance of casting powder is optimized, the crystallization temperature of the casting powder is controlled in a segmented mode according to the carbon content of peritectic steel, and the content of lithium oxide in the casting powder is controlled; secondly, adjusting the control precision of the crystallizer, controlling the opening degree shrinkage amount of a wide-surface copper plate of the crystallizer, and adjusting the narrow-surface taper of the crystallizer according to the type of the crystallizer; and finally, technological operation optimization is conducted, and the position of a tundish submersed nozzle, the fluctuation range of the liquid level of a crystallizer and the frequency of increasing and decreasing the pulling speed are controlled. According to the technical scheme, longitudinal cracks on the surface of the peritectic steel casting blank can be effectively controlled, and the quality and the production efficiency of the casting blank are improved.

The application discloses a nucleating agent, a non-woven fabric and a preparation method and application thereof. The nucleating agent comprises inorganic nucleating agents and high molecular nucleating agents; the inorganic nucleating agents comprise at least one of carboxyl modified nano-silica, nano-calcium carbonate and sharp titanium type nano-titanium dioxide; the high molecular nucleating agents comprise at least one of a wholly aromatic polyester, ethylene-methacrylic acid copolymer sodium salt and a long chain carboxylic acid salt; and the nucleating agent is in the form of a water dispersion. The nucleating agent comprises inorganic nucleating agents and high molecular nucleating agents, and can quickly induce nucleation at a lower temperature, reduce crystallization enthalpy and significantly improve the crystallization rate, so that the mechanical properties, dimensional stability and thermal stability of the non-woven fabric are enhanced. The use of the nucleating agent makes the fiber structure of the non-woven fabric more uniform and dense, reduces the crystallization temperature, improves the mechanical properties, and reduces shrinkage and deformation during use.

Provided are a polyethylene having excellent processability and capable of reducing an injection molding defect rate, and a method of preparing the same. The polyethylene has an integral value in the region where the Log Mw is 5.5 or more in a GPC curve, wherein the x-axis is log Mw and the y-axis is dw / dlogMw, of 9% or less of the total integral value: and has a ratio (Tc10 / Tc40) of a crystallization temperature (Tc10) measured at a cooling rate of 10° C. / min to a crystallization temperature (Tc40) measured at a cooling rate of 40° C. / min of less than 1.04.

A dry fractionation process for high-solid-index grease comprises the following steps: a, raw oil at the temperature of T1 enters a pre-crystallization tank for pre-crystallization, and the pre-crystallization temperature is T2; b, filling the pre-crystallized raw oil in a membrane filter press, and cooling the raw oil in the membrane filter press after filling until the raw oil is cooled to a final temperature T3; c, starting an extrusion system of the membrane filter press to extrude the raw oil to obtain fractionation liquid oil and stearin, and purging a filter chamber after extrusion is finished; wherein the value range of T1 ranges from 40 DEG C to 50 DEG C, the value range of T2 ranges from 10 DEG C to 35 DEG C, and the value range of T3 ranges from 10 DEG C to 25 DEG C. The membrane type filter press can give consideration to extrusion and crystallization, pre-crystallized oil with a good flowing type is conveyed into the high-pressure membrane type filter press through a pump, pre-crystallized raw oil is subjected to program control cooling through cooling water, finally, the final temperature is reached, extrusion is conducted again, the automation degree is high, and the PKS yield is high.

Methods of forming a glass-ceramic article, the method are provided. Embodiments of the method may include initially nucleating a precursor glass composition at a first nucleation temperature and maintaining the first nucleation temperature for a pre-nucleating time period to produce a pre-nucleated crystallizable glass composition, wherein the pre-nucleated crystallizable glass composition comprises 5 wt % to 20 wt % crystalline phase ASTM C1365-18, forming the pre-nucleated crystallizable glass composition into an initial 3D shape; further nucleating the initial 3D shape for a nucleating time period to a second nucleation temperature to produce a nucleated crystallizable glass composition; and ceramming the nucleated crystallizable glass composition to a crystallization temperature and maintaining the ceramming temperature for a crystallization time period to produce the glass-ceramic article. The glass-ceramic article may have a final 3D shape is within 0.1 mm of the original design specifications.

The invention relates to a process for recycling a particulate semi-crystalline polyamide, the initial particulate semi-crystalline polyamide having already been used in a layer-by-layer printing process, the process comprising: - a step of contacting the initial particulate semi-crystalline polyamide with water and at least one acid; - a step of heating the initial particulate semi-crystalline polyamide to a temperature above Tc – 20°C and below Tf, Tc denoting the crystallization temperature of the initial particulate semi-crystalline polyamide and Tf being the melting temperature of the initial particulate semi-crystalline polyamide, and - a step of collecting the treated particulate semi-crystalline polyamide, in which the treated particulate semi-crystalline polyamide has an inherent viscosity lower than the inherent viscosity of the initial particulate semi-crystalline polyamide.

This invention discloses a method for removing BQB impurities from aripiprazole raw material. This method involves controlling the reaction solvent and post-reaction processing during aripiprazole synthesis. By rationally controlling the ratio of reaction solvent to water, the post-treatment temperature, the crystallization temperature, and the time, BQB impurities can be effectively removed. This invention features a simple process and high removal efficiency. Compared to existing technologies, this invention operates under milder conditions and requires less sophisticated equipment, making it suitable for industrial production.

The invention relates to an easy-to-disperse high-performance organic carboxylate nucleating agent and a synthesis method and application thereof, and the method comprises the following steps: adding an organic acid or an anhydride compound and an organic solvent into a container equipped with a stirrer and a reflux condenser according to a predetermined ratio, and stirring and mixing to form slurry; raising the temperature and stirring to prepare a precursor; adding the fatty acid metal salt into another organic solvent solution according to a preset ratio, and uniformly stirring to obtain a fatty acid metal salt suspension solution; dropwise adding the mixture into a container with a nucleating agent precursor, filtering a product after reaction, and drying and crushing the product; the nucleating agent is obtained. Fatty acid can form a coating surface layer, so that agglomeration of super particles of the nucleating agent is prevented, the dispersion effect of the nucleating agent is enhanced, a prepared plastic product shows a lower haze value and a higher crystallization temperature, the use convenience is improved, and the application field is widened.