163results about How to "Increase the nucleation rate" patented technology

The invention provides a method for preparing a polymer microporous foaming material by supercritical mould foaming. The method comprises the following steps of: heating a foaming mould on a mould press to the foaming temperature; placing a polymer into the mould; closing the mould by using the mould press; sealing the mould; introducing supercritical fluid, which swells and diffuses to the polymer, into the mould; and opening the mould by using the mould press to release pressure and foam to obtain the polymer microporous foaming material. Compared with the prior art, the method has the advantages that: the high-temperature and high-pressure supercritical fluid is used for swelling the polymer, so the moulding cycle is greatly shortened; the limit that only microporous foaming sheet material with lesser thickness can be manufactured in the prior art is broken through, so a polymer microporous foaming plate with greater thickness can be manufactured; when the mould is opened, the pressure-releasing speed is high and the foaming pore core-forming speed is high, so the formed microporous foaming material has smaller foaming pores, higher pore density and more excellent performance; and multiple layers of moulds can be placed on one mould press, so the method is suitable for industrialized scale production.

The present invention belongs to the technical field of 3D printing materials, and relates to a 3D printing gypsum ink, and the 3D printing gypsum ink is prepared from the following components by weight: 60% to 93% of gypsum powder, 2% to 20% of filler, 4% to 18% of a modifying solvent and 0.5% to 5% of a coagulant. The present invention also discloses a preparation method of the 3D printing gypsum ink, and all the raw materials are mixed and stirred evenly to obtain the 3D printing gypsum ink. The problems of low strength, poor mobility, coarse particles, poor toughness and high cost in the prior art can be solved, and an economical 3D printing forming material with industrial potential, high speed, good precision and low use cost is developed.

The present invention discloses continuous bubbling carbonizing process for producing superfine active calcium carbonate in the installation with pre-carbonizing tower with high concentration carbonizing gas with CO2 content of 50-99 %, No. 1 carbonizing tower and No. 2 carbonizing tower connected serially. Calcium other slurry passes successively through fine slurry trough, pre-carbonizing tower, No. 1 slurry trough, No. 1 carbonizing tower, No. 2 slurry trough, No. 2 carbonizing tower and chamotte trough; while carbonizing gas passes successively through pre-carbonizing tower, No. 1 carbonizing tower and No. 2 carbonizing tower before being exhausted to air. There are crystal form controlling agent added into the fine slurry trough and dispersant added into the No. 2 slurry trough, and the calcium carbonate slurry in the chamotte trough is prepared into the superfine active calcium carbonate through thickening, activating, dewatering, drying and crushing.

The invention relates to a Fe-based amorphous/nanocrystalline soft magnetic alloy thin belt. A chemical expression formed by elements of the alloy thin belt is FeaSibBaCudMee, wherein the atomic percent of the elements is shown as follows: a is equal to 80-85, b is equal to 2-13, c is equal to 5-13, d is equal to 0.5-2, e is equal to 0.5-5, a+b+c+d+e is equal to 100; Me is Zr, Nb or Mo. The alloy thin belt has a thickness of 15-40 [mu]m and a width of 1-5 mm. Through adding the Me element in the method, the nucleation rate of super-cooled liquid is effectively improved, and the precipitation of a BCC nanocrystalline iron phase is promoted, Fe-based nano alloy is prepared, and the magnetostriction coefficients of a material are reduced, so that the initial magnetic conductivity is improved, and the saturated magnetic induction intensity is obviously improved.

The invention discloses an inorganic hydrous salt phase change energy storage microcapsule and a preparation method thereof. According to the microcapsule, an inorganic hydrous salt phase change material serves as a core material, and a high polymer serves as a capsule wall material. By means of a selection of an appropriate organic solvent, a surface active agent serves as a supplement, polymer monomer materials of the core material and the capsule wall material form an evenly dispersed mixed solution under the ultrasonication action, by means of an addition of functional additives of an initiating agent, a lubricating agent, a stabilizing agent, and a retarder and the like, under the reaction condition, the polymer monomers are subjected to suspension polymerization and solidification in the mixed solution, and then the core material is coated by the polymer monomers to form a phase change energy storage microcapsule. The preparation method is simple in operation and low in equipment requirements, the preparation method range of an inorganic core microcapsule is effectively widened, and by means of the sealing form of the microcapsule, the problems of the supercool and the phase separation of the hydrous salt phase change material are solved.

The present invention discloses a nanometer hydroxyapatite dispersion body and a preparation process thereof. According to the nanometer hydroxyapatite dispersion body, nanometer hydroxyapatite particles are uniformly dispersed in a liquid phase medium, the solid content of the nanometer hydroxyapatite dispersion body is 1-5 wt%, the size of the nanometer hydroxyapatite particles is 40-60 nm, theaspect ratio of the nanometer hydroxyapatite particles is 1-5, and the liquid phase medium is water, an organic solvent, the mixture of a water-miscible organic solvent and water, or the mixture of different organic solvents. According to the present invention, by combining the hydrothermal method and the super gravity technology, the microcosmic mixing effect is strengthened, and the method has advantages of low production cost, simple operation and good repeatability; the prepared nanometer hydroxyapatite dispersion body has advantages of controlled particle size, good dispersion effect andgood stability; and with the technical scheme, the problems of easy agglomeration, poor dispersibility and the like of the nanometer hydroxyapatite particles can be solved, and the product can be endowed with the high application performance and the broad application range.

The invention discloses an electrode active material for a lead-acid storage battery. The electrode active material comprises lead powder and composite material granules; the lead powder comprises one or more kinds of metal lead powder, ball-milling lead powder, Barton lead powder, Pb<2>O powder, PbO powder, Pb<2>O<3> powder, Pb<3>O<4> powder and PbO<2> powder; and the composite material granules comprise one or more kinds of coating type composite material granules and mixed type composite material granules. By virtue of the electrode active material for the lead-acid storage battery with an improved formula, the specific power, specific energy, active material utilization rate, charging-discharging efficiency, cycle life, low-temperature performance and the like of the applied lead-acid storage battery can be obviously improved.

The invention relates to a high-performance copper alloy prepared by a casting method, and belongs to the field of copper alloys. The copper alloy comprises Cu, Cr, Zr and M, wherein the mass percentof the Cr is 0.1-5.0%, and the mass percent of the Zr is 0.1-5.0%; the M is composed of RE and at least two of Mg, Ag, B, Ga, Si, Li, Ti, Fe and Mn; the RE is selected from at least three of Ce, La, Yb, Pr, Nd and Sm; and the mass ratio of the M in the high-performance copper alloy is 0.05-0.5%. The high-performance copper alloy is subjected to casting to obtain an as-cast alloy ingot, and the as-cast alloy ingot is subjected to heat treatment and deformation treatment to obtain a finished product with excellent mechanical properties and electrical conductivity.

The invention provides a magnesium-zinc-zirconium-yttrium-magnesium alloy which comprises the following components in percentage by weight: 2.0-4.0% of zinc, 0.2-0.5% of zirconium and 0.9-5.8% of yttrium and the balance magnesium and impurity. The invention improves optional heat deflection temperature range of the alloy by controlling zinc content in the magnesium-zinc-zirconium series magnesium alloy and adding yttrium element with a proper proportion; higher deflection temperature is favorable for improving the heat deflection plasticity of magnesium alloy and improving extrusion rate; and meanwhile, alloy crystalline grain is refined by the action that high melting point second phase containing yttrium prevents crystalline grains from growing in the heat extrusion deformation recrystallization process so as to obtain magnesium alloy with moderate strength and favorable plasticity. The magnesium-zinc-zirconium-yttrium-magnesium alloy with the optimal proportion has the room-temperature tensile strength of 279 MPa, yield strength of 184 MPa and elongation percentage of 28%.

The invention relates to a method for synthesizing a titanium silicalite molecular sieve TS-1 for catalytic hydrogen peroxide oxidation. The method comprises the following steps of (1) uniformly mixing a titanium source with a silicon source through stirring, so as to obtain clear liquid; (2) mixing an organic template agent with the first clear liquid, hydrolyzing through drastic stirring till clear liquid is formed again, warming to remove glycol so as to obtain second clear liquid, wherein the pH is 11-14; (3) slowly dripping an ammonia solution of ammonium fluoride into the second clear liquid, and stirring while dripping, and finally obtaining clear mother liquid with the same pH as the second clear liquid; (4) crystallizing the clear mother liquid for 12-36 hours at 130-190 DEG C under autogenous pressure, then separating, drying and burning so as to obtain solid powder TS-1 molecular sieve. Compared with the prior art, the method has specific process steps, reduces the particlesize of the crystal due to introduction of fluoride, and improves the catalysis performance.

The invention relates to a preparation method and application of 700 MPa grade ultra-fine grain high-strength weathering steel. The preparation method includes the steps that a continuous casting blank directly enters an M rack rough rolling unit at a high pulling speed and is subject to M-gate continuous high reduction (50%-60%) rough rolling, austenite grains are greatly refined, after rough rolling is carried out, an intermediate billet is quickly heated by an induction heating furnace to the temperature needed by a finish rolling inlet, and meanwhile a reverse temperature field is formed; and then the blank sequentially passes through a finish rolling unit, a laminar cooling part and a reeling machine, and the microstructure characteristics that the surfaces and core parts are thick and 1/4 thickness parts are thin are finally formed. In the production process, finish rolling and rough rolling are both full-endless rolling. By means of the preparation method, an ultra-fine grain high-strength weathering steel strip with the weather fastness equal to that of corten-A can be obtained, the effects of replacing thick parts with thin parts and replacing cold with heat are achieved, and the automotive body weight is small; and meanwhile, the service life of an automotive sheet is prolonged, the production efficiency is improved, the production cost is reduced, energy consumption is reduced, emission is reduced, and resource-saving and environment-friendly production is achieved. The preparation method and application belong to the technical field of metallurgy.

The invention provides a rotary liquid membrane reactor, belonging to the technical field of an inorganic functional material and used for preparing the stratiform hydrotalcite PVC heat stabilizer. Starting from a basic technique of a coprecipitation method and based on a crystal chemical principle, the invention designs the rotary liquid membrane reactor through calculation and analysis of fluid mechanics, so that two fluids flow in a turbulence manner within a confinement space. Therefore, the supersaturation degree is uniform, the nucleation rate of a system is improved, and the crystallization generation rate is reduced; alamellar hydrotalcite PVC heat stabilizer with smaller grain size and narrower grain size distribution is obtained. The grain size of the product can be controlled within a range of 10-150 nm, and the size distribution range can be reduced to 20-50 nm.

The invention discloses an Fe-based nanocrystalline soft magnetic alloy. The molecular formula of the alloy is FeaSibBcMdCuePfAlg, M refers to the metallic element Nb, Mo, V, Mn or Cr, a, b, c, d, e,f and g are mole percentage content of corresponding atoms, b is larger than or equal to 6 but smaller than or equal to 15, c is larger than or equal to 5 but smaller than or equal to 12, d is largerthan or equal to 0.5 but smaller than or equal to 3, e is larger than or equal to 0.5 but smaller than or equal to 1.5, f is larger than or equal to 0.5 but smaller than or equal to 3, g is larger than or equal to 0.5 but smaller than or equal to 10, and the balance is Fe and inevitable trace impure elements; the structure of the Fe-based nanocrystalline soft magnetic alloy is the two-phase alloywith the Fe adopting the body-centered cubic structure and Fe(Si, Al) mixed nanocrystalline grains embedded in an amorphous matrix, and the average size ranges from 10 nm to 13 nm. The invention further provides a preparation method of the Fe-based nanocrystalline soft magnetic alloy. The method includes two-step heating and two-step cooling heat treatment. The Fe-based nanocrystalline soft magnetic alloy has the advantages of low cost, excellent soft magnetic property, high corrosion resistance as well as good manufacturability and heat treatment processability, and has the broad applicationprospects in the fields of noise suppression, filtration, wireless charging and the like in complex and harsh environments.

The invention relates to a supergravity field micro-reactor for preparing a nanometer material. The supergravity field micro-reactor comprises a micro-reaction assembly, a material receiving groove provided with a material outlet, a first motor, a transmission system, a material inlet system and a support system, wherein the micro-reaction assembly comprises an upper disc and a lower disc, micro-grooves are respectively distributed on the bottom surface of the upper disc and the top surface of the lower disc, the center position of the lower disc is provided with a material inlet micro-pore channel, a 0.03-0.1 mm gap is arranged between the bottom surface of the upper disc and the top surface of the lower disc after the combination, the first motor drives the transmission system to operate so as to make the upper disc and the lower disc in the micro-reaction assembly rotate in opposite rotation directions, and an upper disc lifting system can be additionally arranged so as to conveniently adjust the gap between the bottom surface of the upper disc and the top surface of the lower disc in the micro-reaction assembly and wash the upper disc and the lower disc. With the supergravity field micro-reactor of the present invention, the nanometer material is prepared by using the liquid phase precipitation method, such that the high dispersion property and the uniform particle distribution of the nanometer material can be maintained while the treatment capacity can be increased and the clogging of the micro-reaction assembly can be avoided.

The invention discloses a method for preparing a beta-NaYF4:Yb3+,RE3+(RE=Tm,Er,Ho) upconversion nanocrystal with the size of less than 8nm. Nucleation rate of a beta phase is accelerated and conversion from alpha-NaYF4 to beta-NaYF4 is efficiently promoted by introducing a sodium oleate ligand in a preparation process, so that reaction time for obtaining a pure phase beta-NaYF4: Yb3+,RE3+(RE=Tm,Er,Ho) upconversion nanocrystal can be shortened, and reaction temperature can be lowered. The prepared beta-NaYF4:Yb3+,RE3+(RE=Tm,Er,Ho) upconversion nanocrystal is small in size (4-8nm), good in dispersibility and free of an impure phase (alpha-NaYF4), the preparation method is simple, repeatability is high, and the beta-NaYF4:Yb3+,RE3+(RE=Tm,Er,Ho) upconversion nanocrystal has a wide application prospect.

The invention provides a poly-L-lactic acid (PLLA)/ZIF-8 composite bone scaffold and a preparation method thereof. The composite bone scaffold is prepared from the following components in percentage by weight: 97-99.5% of PLLA, and 0.5-3% of ZIF-8. The preparation method of the composite bone scaffold includes the steps that the PLLA and ZIF-8 powder are subjected to liquid-phase mixing, and through stirring, ultrasound, separation and drying, composite powder is obtained; and then by utilizing a selective laser sintering process, after the composite powder is sintered layer by layer, the PLLA/ZIF-8 composite bone scaffold is finally obtained. By utilizing good combination between the ZIF-8 and a PLLA substrate, interface combination between the PLLA and the ZIF-8 is improved, and thus themechanical strength of the composite bone scaffold is improved; and in addition, by utilizing the characteristic of degradation of the ZIF-8 in the acidic environment, the degradation rate of the PLLA is increased, and cell proliferation is improved.

The invention discloses a preparation method of intensity-improvable glass ceramics. The method comprises the following step of 1, weighing the following raw materials in corresponding percentage by weight for later use: 32 to 38 percent of SiO2, 26 to 30 percent of Al2O3, 12 to 18 percent of MgO, 0.3 to 0.5 percent of Fe2O3, 14 to 18 percent of electrolytic manganese residue, 0.02 to 0.06 percentof tin phosphorus compounds, 0.01 to 0.05 percent of rare earth elements and 0.01 to 0.03 percent of intensity auxiliary agents. The preparation method of the intensity-improvable glass ceramics hasthe advantages that the intensity of the glass ceramics is greatly improved through being compared with that in the prior art; high use values and good application prospects are realized.

The invention relates to a microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material and a preparation method thereof. The microspheric three-dimensional grading micro-nano structure bismuth tungstate photocatalytic material is of a microspheric structure formed by assembling two-dimensional nanosheets with rough surfaces, is uniformly distributed, and has the microsphere diameter being 2.5 to 3.5mum. The preparation method comprises the following steps of a reacting sodium tungstate solution and a bismuth nitrate solution in a reaction kettle for 8 to 24 hours under the condition that pH is equal to 1 and the temperature is 150 to 200 DEG C, separating to obtain a solid product, washing and drying. The obtained product is good in stability, large in specific surface area, and beneficial to diffusing and transmitting pollutant molecules, and greatly increasing the photocatalytic activity, and in addition, the preparation method is simple, controllable in reaction condition, and low in temperature.

The invention provides a device system and preparation technology for preparing a submicron material through a continuous hydrothermal method. The device system comprises burdening kettles, a preheater, a first crystallizer and a second crystallizer. The first burdening kettle is communicated with the first crystallizer through a first feeding pump and the preheater, and the second burdening kettle is communicated with the first crystallizer through a second feeding pump. The first crystallizer is communicated with the second crystallizer, a discharging opening of the second crystallizer is communicated with an inlet of a heat exchanger, one outlet of the heat exchanger is communicated with an outer circulating unit and then communicated with an inlet of the second crystallizer, and the other outlet of the heat exchanger is communicated with an aftertreatment unit and a slurry collector. The first crystallizer is a tubular reaction crystallizer, and the second crystallizer is a continuous crystallizer. The device system is adopted in the preparation technology. According to the device system and preparation technology, the device cost is low, meanwhile, the submicron material with even particle size distribution and the high degree of crystallinity can be prepared continuously, and the device system and preparation technology are suitable for industrial production.