38results about How to "Small particle size range" patented technology

The present invention relates to a self-regulating electrical resistance heating element, to an appliance containing same, and to processes for their manufacture. The self regulating electrical resistance heating element (10) comprises a substrate (12) comprising an electrically conductive coating (12a) which serves as a first electrical contact (18) on one side of the composite metal oxide layers. Disposed on said electrically conductive layer (12a) is a first metal oxide (14) which has a positive temperature coefficient of resistance. Overlaying the first metal oxide layer, and in electrical series thereto, is a second metal oxide layer (16) having a negative temperature coefficient of resistance and overlaying this layer is a second electrical contact (20). The second metal oxide layer (16) having a negative temperature coefficient of resistance is applied to the element in a manner which ensures it's resistive characteristics are not altered.

The invention relates to a lead-free high-Curie temperature PTCR (positive temperature coefficient resistor) ceramic material and a preparation method thereof. The composition of the ceramic material is of Ba1-x (Bi0.5Na0.5)xTiO3, wherein x is not less than 0 and not more than 0.06. A sol-gel method is adopted for preparing the lead-free PTCR material and the method, the sintering temperature of a traditional solid-phase reaction method is too high, when the temperature is above 1300 DEG C, BNT (Bi0.5Na0.5TiO3) is very easy to decompose during the sintering process, and the material is further difficult to be semi-conducted; and by adopting the sol-gel method according to the invention, the sintering can be performed at the temperature of 1250 DEG C, and the sintering temperature is reduced. When the BNT content is more than 2mol%, the sintering and the semi-conduction can not be performed in an air atmosphere by using the traditional solid-phase reaction method, and the sintering needs to be performed under a reducing atmosphere. However, when the BNT content is 5mol%, the material still has the properties of a semi-conductor by using the method disclosed by the invention, and the Curie temperature is obviously increased.

The invention discloses a separation column filler for separating PCBs (Poly Chlorinated Biphenyls) or OCPs (Organic Chlorine Pesticides) in a high-fat content sample and a separation method. The filler is composed of 30%-35% of silica gel-florisil mixture, 50%-60% of acidic modified silica gel and 10%-15% of anhydrous sodium sulfate, by weight percentage. The separation column filler provided by the invention can be filled in a separation column for conventional column chromatography or a Seitz four-channel chromatographic separator, and used for chromatographic separation with the mixed solution of normal hexane and dichloromethane as a mobile phase. With the filler provided by the invention to separate the PCBs or the OCPs, the separation method is efficient, quick and simple in process; an obvious separation effect can be achieved under the condition of low cost; the column recovery rate of the PCBs materials is in the range from 93% to 105% and adding standard recovery to fish tissues is in the range from 74% to 100%; and the column recovery rate of the OCPs materials is in the range from 77% to 120% and adding standard recovery to fish tissues is in the range from 78% to 102%.

The invention relates to waterborne CNTs (carbon nanotubes)-graphene composite wire dye paste, a waterborne CNTs-graphene composite heating wire and waterborne CNTs-graphene composite heating cloth. The waterborne CNTs-graphene composite wire dye paste is prepared from, by mass, 0.01-35 parts of waterborne graphene solution, 50-70 parts of waterborne carbon nanotube solution, 0.01-1 part of an antifoaming agent, 0.01-1.5 parts of a wetting agent, 5-30 parts of resin and 0.01-5 parts of a thickening agent. The waterborne CNTs-graphene composite heating wire is coated with the waterborne CNTs-graphene composite wire dye paste. The waterborne CNTs-graphene composite heating cloth comprises the waterborne CNTs-graphene composite heating wire. The waterborne CNTs-graphene composite wire dye paste is small in particle size range and uniform in conductivity, the average particle size is about 1micron, a resistance range of a graphene wire formed by coating of a wire with the wire dye paste is200 ohm/cm-300 ohm/cm, the waterborne CNTs-graphene composite heating cloth formed by the CNTs-graphene composite heating wire is uniform in heating, and the temperature difference of per square meter of the heating cloth is smaller than 5 DEG C.

The invention provides a Fe3O4 nanoparticle and a preparation method thereof. The particle size of the nanoparticle is between 20 and 30nm, the saturation magnetization strength is 70emu/g or above 70emu/g, the residual magnetism 0.2emu/g or below 0.2emu/g and the coercivity is 1.0Oe or below 1.0Oe. The preparation method comprises the following steps: (A) dissolving ferrous salt to form a reaction solution, adding alkali to regulate the pH value of the reaction solution to 6 to 9 and carrying out ultrasonic reaction at 60 to 80 DEG C for 2 to 6 hours; (B) raising the temperature to 80 to 90 DEG C, reacting and curing for 0.5 to 1.5 hours, cooling, centrifuging and carrying out vacuum drying to obtain a finished product. The Fe3O4 nanoparticle prepared with the method has the advantages ofrelatively narrow particle size range, excellent magnetic performance, high saturation magnetization strength, weak residual magnetism and very low coercivity; in microstructure, the easy magnetization directions among the nanoparticles are identical; the Fe3O4 nanoparticle shows good super-paramagnetism.

The invention discloses an iron-based low-alloy-steel powder for powder metallurgy and a preparation method of the iron-based low-alloy-steel powder. The iron-based low-alloy-steel powder for powder metallurgy comprises, by total weight, 0.1-0.85% of graphite, 0.5-1.2% of lubricants, 0.5-4% of alloy powder 8-12 micrometers in grain size and 95-98% of iron powder. The preparation method includes: adding the graphite, the lubricants and the alloy powder into the iron powder with uniform mixing. Compared with the prior art, the iron-based low-alloy-steel powder for powder metallurgy is less in alloy powder content and small in grain size range and has good compactibility. Besides, production cost is lowered while wear of the powder to dies is avoided during sintering of parts, and sufficient diffusivity is further provided, so that the compacted parts prepared by the iron-based low-alloy-steel powder have good mechanical property.

The invention relates to the technical field of preparation of aluminum hydroxide, in particular to a preparing method of superfine super-white aluminum hydroxide micropowder. The method includes thesteps of injecting a sodium aluminate solution into a crystallizing reactor, arranging six feeding pipes in the crystallizing reactor, forming a discharge port in the bottom of the crystallizing reactor, arranging a material distributing groove in the top end of the crystallizing reactor, making the six feeding pipes communicated with the bottom of the material distributing groove, making the discharge port communicated with the top end of the material distributing groove through a circulating pump, and making the six feeding pipes evenly distributed on the top edge of the crystallizing reactor and incline towards the center of the crystallizing reactor by 5-60 degrees so that materials in the crystallizing reactor can be cyclically distributed at multiple angles and the sodium aluminate solution can be evenly distributed after the multi-angle material distribution of the feeding pipes. The particle size range of the obtained aluminum hydroxide micropowder is narrowed, the whiteness variation range is greatly narrowed, the whiteness is improved, and the quality of the aluminum hydroxide micropowder is improved.

The invention discloses a plaster for treating beriberi and a preparation method thereof. In the invention, the raw liquid of bamboo vinegar is filtered to remove impurities and sediments, and then powdery or flaky chitosan is added to the bamboo vinegar according to the formula ratio. Stir continuously until the chitosan is completely dissolved, adjust the pH value to strong acidity, filter the solution to remove insoluble matter, add an emulsifier, disperse it with a nano-disperser, let it stand still to obtain a uniformly dispersed nano-sol, then add Vaseline, and simmer over a low heat to make Apply the plaster on a medical cotton pad. The beriberi liquid prepared by the invention has the characteristics of convenient use, non-toxicity, low cost, high special effect and the like. Also opened up a new direction for the utilization of bamboo wood vinegar simultaneously. The preparation process of the method is simple to operate, no special equipment is needed, the preparation period is short, and the cost is low.

The invention discloses a waterborne epoxy resin emulsion for glass fibers and a preparation method of the waterborne epoxy resin emulsion. By using diol compounds of oxiron and ethylnen oxide emulsifier and shearing and stirring at high rotating speed of 8000r/min and simultaneously combining a phase inversion technique, the prepared epoxy resin emulsion finishes the process from a water-in-oil flow to an oil-in-water flow; the particle size range of the prepared emulsion is 150 to 300nm; the waterborne epoxy resin emulsion has the characteristics of narrow particle size range, concentrated particle size distribution and stable centrifugal performance; after the waterborne epoxy resin emulsion is stood at normal temperature and normal pressure for 12 months, no demulsification or layering phenomenon is cuased; after the emulsion is dried at the temperature of 110DEG C, a formed membrane is hard, good in toughness and high in strength.

The invention relates to a coating film removing agent and a polymerization method for improving the porosity of a polyvinyl chloride resin, and belongs to the field of polymer polymerization. According to the present invention, the coating film removing agent comprises a glyceride compound and an organic solvent, wherein the glyceride compound is formed by mixing one or more than two materials selected from glyceryl monostearate, mixed glyceryl stearate, glyceryl laurate and glyceryl palmitate according to any ratio, the organic solvent is formed by mixing one or more than two materials selected from benzene, toluene, xylene, acetone, methanol and butanol according to any ratio, and a ratio of the glyceride compound to the organic solvent is 1:3-49; during the polymerization of polyvinylchloride, the use amount of the coating film removing agent is 0.2-15%; and the prepared polyvinyl chloride resin has significantly-increased pore structures on the particle surface, reduced apparentdensity, increased surface pore structure and increased DOP absorption, such that the results show that the internal porosity is increased, and the internal pore structure is increased.

The invention discloses a medicament for treating beriberi and a preparation method thereof. In the invention, the raw liquid of bamboo vinegar is filtered to remove impurities and sediments, and then powdery or flaky chitosan is added into the bamboo vinegar according to the formula ratio. Stir continuously until the chitosan is completely dissolved, adjust the pH value to strong acidity, filter the solution to remove insoluble matter, add an emulsifier, disperse with a nano-disperser, and let stand to obtain a uniformly dispersed nano-sol medicament. The beriberi liquid prepared by the invention has the characteristics of convenient use, non-toxicity, low cost, high special effect and the like. Also opened up a new direction for the utilization of bamboo wood vinegar simultaneously. The preparation process of the method is simple to operate, no special equipment is needed, the preparation period is short, and the cost is low.

The invention belongs to the technical field of flavorings and in particular relates to spice micro-emulsion and further discloses a preparation method of the micro-emulsion, and application of the micro-emulsion in preparation of flavorings. According to the spice micro-emulsion disclosed by the invention, an emulsifier, a co-emulsifier, a thickening agent, an oil phase and aqueous phase components are added on the basis of spice essential oil or/and oleoresin, and due to the assistance of lipase, micro-emulsion particles are prepared, and the micro-emulsion is narrow in particle size range and excellent in water solubility and solution dispersity; and when the micro-emulsion serves as a condiment, components in the spice can be released to the greatest degree after the micro-emulsion isadded after cooking, the penetrating quality of spicy smell is well achieved, the sensory quality of dishes can be improved, and the taste is excellent.

The invention discloses a compound aminophylline sustained-release capsule and a preparation method thereof. The inclusion compound is prepared by adopting the method of the β-cyclodextrin inclusion compound sustained-release capsule, and 8-12 parts by weight of the β-cyclodextrin Make a saturated aqueous solution, then gradually add 2.8 to 4.2 parts by weight of aminophylline and hot water solution of cholophylline extract, dry under reduced pressure and vacuum, and crush the solid to obtain clathrates; prepare slow-release granules: 20 to 50 parts by weight ethyl cellulose, 0.87 to 2.3 parts by weight of hydroxypropylmethylcellulose and 8 to 23 parts by weight of the prepared clathrate are mixed in a dry container, added with ethanol solution, stirred to a solid state, dried, pulverized, Obtaining granules; filling of sustained-release capsules: filling empty capsules with the prepared granules to obtain β-cyclodextrin aminophylline inclusion compound sustained-release capsules. The sustained-release capsule of the present invention has good taste, stable quality, can accurately calculate the dose, and reduces the occurrence of adverse reactions that may be caused by inaccurate doses. Moreover, the preparation method is simple to operate, does not require a sterilization step, does not require special equipment, has a short preparation cycle, and is low in cost.

The invention discloses a device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide. The device comprises a purified slurry plasma inlet, a supercritical CO2 input spray pipe, a carbonization reactor, a positive and negative paddle turbine combination, a crystal form control agent inlet, a Laval nozzle and a central shaft, the supercritical CO2 input spray pipe is arranged on the purified slurry plasma inlet, the seminal plasma inlet is arranged at the inlet of the carbonization reactor, the purified slurry plasma inlet is a gradually reduced horn tube, the inlet of the carbonization reactor is a small horn opening, and the outlet of the carbonization reactor is connected with the Laval nozzle. The carbonization reactor is a sealed tank body which is gradually enlarged and then gradually reduced from a feed port to a discharge end, the crystal form control agent inlet is formed in the upper part of the front end of the carbonization reactor, and the positive and negative paddle turbine combination is arranged in the carbonization reactor and is mounted on the central shaft. The device disclosed by the invention is controllable in carbonization process, length-diameter ratio and crystal form, uniform in finished product granularity and narrow in distribution, and can be used for generating various crystal forms of calcium carbonate in different fields.

The invention discloses a bromhexine hydrochloride nano-cough syrup and a preparation method thereof, comprising 40-60 parts of bromhexine hydrochloride, 30-60 parts of a filler, 2-8 parts of swelling auxiliary materials, 1-5 parts of an adhesive, 0.5-1 part of lubricant and 1-3 parts of sweetener are prepared by dissolving, mixing, vacuum distillation, and dispersing into a gel by a nanometer disperser. The comparison test results of the prepared bromhexine hydrochloride cough syrup and the commercially available cough syrup show that the present invention disintegrates quickly, has high dissolution rate and dissolution rate, short time to peak blood drug concentration, rapid release-absorption, complete tablet appearance, and Stronger hardness, delicate and refreshing taste, no gritty feeling; compared with the existing technology of preparing orally disintegrating tablets by freeze-drying, vacuum drying, and spray-drying methods, the present invention does not require special production equipment and conditions, nor does it require special packaging. The preparation process is simple, the cost is low and the benefit is high.

The three-stage crushing system comprises a conveying mechanism, a feeding machine, a screening device, a first finished product bin, a second finished product bin, a third finished product bin and a fourth finished product bin. The screening device comprises a first-stage screen body, a second-stage screen body and a third-stage screen body which are of a double-layer screen structure, the first-stage screen body is used for separating the asphalt mixture into first-stage large-particle-size particles, first-stage medium-particle-size particles and first-stage small-particle-size particles, and the second-stage screen body is used for separating the first-stage small-particle-size particles into second-stage large-particle-size particles and second-stage small-particle-size particles; the third-stage screen body is used for separating the second-stage small-particle-size particles into third-stage large-particle-size particles and third-stage small-particle-size particles. The invention further discloses an asphalt mixture three-stage crushing method based on the asphalt mixture three-stage crushing system. According to the invention, the asphalt mixture can be subdivided into four grades, the particle size range of the single-grade finished product material is small, the mixing rate is low, the adulterability in the standard synthesis grading range is high, and the grading control is more stable.