64results about How to "Process operation is easy to control" patented technology

The invention relates to the technical field of semiconductor photoelectronic device manufacturing, in particular to a semiconductor light emitting diode (LED) with a nanometer light emitting surface. The inventive method comprises growing a dielectric layer (12) and a metal layer (13) on a GaP layer (2) of the conventional LED, and sequentially using the metal layer (13) as a mask to etch the dielectric layer (12) and the parts outside a P type electrode (11) on the upper surface of the GaP layer (2) to obtain the LED with the nanometer light emitting surface. The method also comprises coating a layer of indium tin oxide (ITO) conducting film (10) on the nanometer light emitting surface and the upper surface of the P-type electrode (11), and preparing a P-type electrode (11) with the same structure on the P-type electrode (11) coated with the ITO conducting film (10). The invention reduces light reflex, improves device performance, and can be used in various semiconductor LEDs. Meanwhile, the invention has the advantages of simple process, low cost, and applicability to batch production.

The invention relates to a high-gloss PTFE (polytetrafluoroethylene) anti-drop agent and a preparation method thereof. The preparation method includes: 1), adding a small amount of an emulsified monomer A solution to a PTFE emulsion and performing irradiation treatment on the PTFE emulsion in high energy ray, and grafting a small number of monomers on the surface of PTFE particles; 2), in the absence of oxygen, initiating monomer B to perform polymerization reaction in the treated PTFE emulsion by the aid of an initiator and adding a cross-linking agent at a later stage to form nuclear-shell nano PTFE composite particles with PTFE particles as nuclears and a polymer as a shell; 3), filtering the modified PTFE emulsion and subjecting a filtrate to spray drying to obtain the high-gloss PTFE anti-drop agent. With the method, under the condition that no dispersants or compatibility agents are added, the anti-drop agent can be well-dispersed in thermoplastic resin with good compatibility, and light transmission, glossiness and the like of matrix resin are unaffected by the anti-drop agent dispersed in engineering plastics of PA, PC and the like.

The invention relates to the technical field of smelting indium, in particular to relates to a technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting. In the process of acidization, the zinc oxide of the invention is acidated by sulphuric acid; after the acid leaching of the zinc oxide, oxyful is used for the deep removal of iron by oxidation in the process of impurity removal of liquid; after the acidization of the zinc oxide, sulphuric acid is used for acidization leaching in a secondary leaching process; the multistage centrifugal extraction which is rich in indium liquid after impurity removal adopts the mixture of Cyanex923 and P204 as a composite extractant; and the back extraction adopts the mixed liquid of 3 mol/L HCL and 2 mol/L ZnC as a back-extractant. The technological method for extracting the indium from the zinc oxide generated from the waste residue from zinc by hydro-smelting has the advantages that the indium smelting production technology parameter and equipment adapt to high altitude and low air pressure environment, the technology is simple, and the operability is high; and the application of the method and the composite extractant of the invention can increase the recovery rate of indium by 10 to 15 percent.

The invention relates to a reduced graphene oxide coated platinum/stannic oxide nano-particle cluster gas sensor and a preparation method thereof. The structure of a composite is like a core-shell composited structure, wherein the platinum atoms are evenly distributed on the surface of stannic oxide to form a core of a nano-particle cluster, and the surface of the whole core is coated with reducedgraphene oxide as a shell. Aiming at the problems of low sensitivity, high working temperature, high production cost and complicated preparation process in the prior art, the invention provides the reduced graphene oxide coated platinum/stannic oxide nano-particle cluster gas sensor and the preparation method thereof. The prepared methyl alcohol sensor can detect at high sensitivity and at the temperature of 110 DEG C, can respond fast, and is high in stability at the same time; in addition, the preparation method is simple and controllable, the production cost is low, the preparation methodis easy to product on the large scale, and the application prospect is quite excellent.

The invention discloses an autoclaved fly ash brick for construction, which is prepared from the following raw materials by weight in mixture ratio: 13 to 17 of boiler slag, 13 to 17 of fly ash, 8 to 12 of granolithic, 18 to 22 of carbide slag and 38 to 42 of mountain flour. When the fly ash brick is prepared, the boiler slag, the fly ash, the granolithic, the carbide slag and the mountain flour which are ground into a powder shape are mixed evenly according to the mixture ratio by weight of 13 to 17:13 to 17:8 to 12:18 to 22:38 to 42, water is added, and a mixed material with the water content of 10 to 15wt% is prepared and is autoclaved and cured to prepare a finished product after the mixed material is pressed and molded. The invention has simple technological formula, easy control of the technological operation and stable product quality and is a novel energy-saving environment-friendly process.

The invention relates to an extraction method for sweet potato dietary fiber. The method includes: selecting starch extracted sweet potato residue as the raw material, conducting soaking by clear water, adding water and smashing the material into a sweet potato residue slurry; adding a sodium hydroxide solution into the sweet potato residue slurry to dissolve out the protein and fat therein; performing filtration, adding a hydrogen peroxide solution into the sweet potato residue subjected to alkali treatment to remove sweet potato residue polyphenol; conducting filtration, then adding a hydrochloric acid solution into the sweet potato residue polyphenol removed sweet potato residue to dissolve out the starch in the sweet potato residue; performing filtration, then flushing the acid treated sweet potato residue by distilled water to neutral, thus obtaining a neutral sweet potato insoluble; and carrying out drying and crushing, thus obtaining sweet potato dietary fiber. The method provided by the invention has the advantages of reasonable process, strong operability, high dietary fiber yield and purity, and can be used for large scale industrialized production.

The present invention relates to a comprehensive processing technique of industrial wastewater, and specifically to the comprehensive extraction and processing method of industrial wastewater, wherein the industrial wastewater simultaneously comprises bromine, low molecular organic acid and low molecular alcohol. The invention is characterized in that the technique comprises the following steps: 1) oxidizing; 2) esterifying, 3) rectifying; 4) hydrolyzing and rectifying; 5) rectifying the bromine; 6) refining the bromine; 7) rectifying the hydrochloric acid; and 8) crystallizing the sodium chloride. Compared with the prior art, the method and technique of the invention have the advantages of easy control, energy consumption saving, obtainment of industrial product standard of each recycling object quality, high value, considerable economic benefit, basic realization of zero discharge of wastewater, and total obtainment of environmental requirement.

The invention relates to a method for preparing a Y2Si2O7 whisker-toughened mullite composite coating. The method comprises the following steps: preparing a SiC porous internal coating on the matrix surface of a C/C composite material through an embedding method, preparing Y2Si2O7 whiskers, and then performing surface modification to the Y2Si2O7 whiskers with a composite surface active agent to obtain a mixed liquor; and performing ultrasonic electrophoretic selective assembly deposition to the C/C composite material prepared with the SiC porous internal coating and the mixed liquor to obtain a Y2Si2O7 whisker pinning layer, and finally preparing the Y2Si2O7 whisker-toughened mullite composite coating through a hydrothermal electrophoretic deposition method. Compared with other coatings, the prepared Y2Si2O7 whisker-toughened mullite composite coating can effectively increase the oxidation-resistance temperature, can realize the anti-oxidation protection of 400 hours for the C/C composite material under the condition of dynamic brush of high temperature (1700 DEG C) gas, and the oxidation loss rate is lower than 0.77 percent.

The invention provides a method for synthesizing (R)-9(2-(diethyl phosphonyl methoxyl) propyl)-adenine. The method includes the following steps of: implementing condensation reaction of (R)-hydroxypropyl adenine and tosyloxy methyl diethyl phosphate in solvent under the catalysis of catalytic amount of dialkyl magnesium, and then collecting generated PMPA diethyl ester from the reaction product. By using the method to produce the PMPA diethyl ester, the yield rate and the purity can be improved to over 80 percent, the used agent is safe, and the process operation is easy to control.

The invention discloses a synthesis method of diphenylphosphine chloride, belongs to that technical field of chemical synthesis and solves the problem of low yield of the prior diphenylphosphoric chloride product. The synthesis method of diphenylphosphine chloride is characterized by comprising the following steps: under that protection of dry nitrogen, opening and stirring, adding benzene, phosphorus trichloride and catalyst to a reactor, and raising the temperature to 50 DEG C-80 DEG C and performing reflux reaction at 50 DEG C-80 DEG C for 2-3 h; after the reaction in step S01 is completed, raising the temperature to 85-200 DEG C and performing reflux reaction at 85-200 DEG C; at that end of step S02, after the reactor is cooled down, adding benzene into the reactor, adding a decomplexing agent, stirring until the decomplexing agent is dissolved and distilling to remove benzol, and then performing vacuum distillation to obtain the front fraction and the rear fraction. The inventionhas the advantages of high product yield.

The invention discloses a canagliflozin drug impurity as well as a preparation method and application thereof. The invention provides a compound as well as a preparation method and application thereof. The method comprises the following steps: (1) enabling the compound as shown in formula 2 to be in contact with an alkaline lithium hydroxide aqueous solution to obtain a coarse product containing a compound as shown in formula 3, wherein the coarse product contains a compound as shown in formula 1; (2) crystallizing and filtering the coarse product to obtain mother liquor; (3) concentrating the mother liquor to obtain residues; and (4) crystallizing and filtering the residues in an L-proline-containing organic solvent, thus obtaining the compound as shown in formula 1. The method provided by the invention can realize directed preparation of the compound as shown in formula 1, and a reliable impurity contrast is provided for quality research on industrially produced canagliflozin-series diabetes treatment drug products and quantitative control over impurities.

The invention provides a method for preparing phosphonyl methoxyl nucleotide analogue, including the following steps of: implementing reflux reaction of (R)-9-(2-(diethyl phosphonyl methoxyl) propyl)-adenine and trimethylchlorosilane in solvent in the presence of catalytic amount of catalyst, and then collecting the target product: (R)-9-(2-(diethyl phosphonyl methoxyl) propyl)-adenine from the reaction product, wherein the catalyst is sodium halide. In the method, the used agent is cheap, easily available, safe and low in cost; the process operation is easy to control and the purity of product can reach over 99 percent.

The invention relates to the field of chemical synthesis, in particular to a compound as well as a preparation method and application thereof. The compound is an impurity generated in the production process of canagliflozin, and can be applied to quality control of canagliflozin products by serving as a standard substance or a reference substance.

Provided is a method for synthesizing beta-Artemether. The method uses dihydroartemisinin as a raw material, which has an etherifying reaction with trimethyl orthoformate in an organic solvent in the presence of catalyst, to give beta-Artemether, with a byproduct alpha-Artemether content of less than 6%.