43results about How to "Low preparation efficiency" patented technology

The invention discloses a three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional silicon carbide fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional silicon carbide fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material is 10%-16%. A preparation method comprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5)repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional silicon carbide fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree, high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation methodis high, and the compact degree and mechanical properties of the prepared composite material are remarkably improved.

The invention belongs to the technical field of maltose syrup, and specifically relates to a method for preparing ultra-high maltose syrup by a multi-enzyme method. Rice starch is dissolved in deionized water, acidified by adding an acidulant, and α-amylase is added for ultrasonic reaction and constant temperature and pressure. The first-level enzymatic solution is obtained by reaction; after the first-level enzymatic solution is subjected to vacuum distillation, an acidulant is added to obtain an acidified first-level enzymatic solution; then pullulanase, β-amylase and maltase are dissolved in water to form a three-enzyme mixture After microwave heating to a constant temperature, slowly add the acidified primary enzymatic solution dropwise, and carry out microwave stirring reaction to obtain the crude maltose syrup. Finally, after ultrasonic washing with absolute ethanol and vacuum distillation reaction, activated carbon filtration and micro-mesh filtration to obtain ultra-high Maltose syrup. The invention solves the problem that the maltose content can only reach 80% in the current technology, can stably obtain the maltose content reaching 95%, and can control the glucose below 4.5%, and has good application prospect.

The invention discloses a three-dimensional carbon fiber preform reinforced yttrium silicate composite material. The composite material comprises a three-dimensional carbon fiber preform and yttrium silicate, the yttrium silicate is a mixed crystalline phase of Y2Si2O7 and Y2SiO5, a crystalline phase of the Y2Si2O7 or a crystalline phase of the Y2SiO5, the pores of the three-dimensional carbon fiber preform are uniformly filled with the yttrium silicate, and the porosity of the three-dimensional carbon fiber preform reinforced yttrium silicate composite material is 9%-14%. A preparation methodcomprises the following steps: (1) preparing a Y2O3-SiO2 composite sol; (2) performing impregnating; (3) performing drying; (4) performing heat treatment; and (5) repeating processes including impregnating-drying-heat treatment in the steps (2)-(4). The three-dimensional carbon fiber preform reinforced yttrium silicate composite material has the advantages of low porosity, a high compact degree,high-temperature resistance, oxidation resistance, excellent mechanical properties and the like; and the preparation efficiency of the preparation method is high, and the compact degree and mechanicalproperties of the prepared composite material are remarkably improved

The invention discloses a construction method of a cast-in-place cover beam. Construction equipment is used. The construction equipment comprises a box body, a first transmission cavity is formed in the box body, a first motor is fixedly arranged in the upper end wall of the first transmission cavity, the lower end of an output shaft of the first motor is in power connection with a power shaft stretching downwards, a sun wheel is fixedly arranged on the outer surface of the power shaft, planet wheels are symmetrically engaged with the left side and the right side of the sun wheel, stirring shafts stretching downwards are fixedly arranged on the inner surfaces of the planet wheels, the outer sides of the planet wheels are engaged with gear rings, the gear rings are fixedly connected with the inner wall of the first transmission cavity, first containing cavities are formed in the lower end wall of the first transmission cavity in a left-and-right-symmetry manner, and a stirring cavity communicates with the portions below the left first containing cavity and the right first containing cavity. By means of the equipment, the preparation efficiency of concrete can be improved, and the preparation time of the concrete can be effectively shortened.

The invention discloses a high-activity stone powder-based concrete admixture which comprises a mixture A, a mixture B and a mixture C. The mixture A comprises a water reducing agent, activated clay powder or montmorillonite powder and a surfactant, the mixture B comprises an early strength agent and a thickening agent, and the mixture C comprises a cosolvent and a defoaming agent. Free water is reduced by utilizing the moisture absorption effect of the activated clay powder or montmorillonite powder, so that the influence of a humid environment on the humidity of the concrete mixture is reduced. The strength of the concrete is improved by adding the water reducing agent, the early strength agent and the defoaming agent, and meanwhile, by adding the components such as the surfactant, the thickening agent and the cosolvent, the fusion effect of all the components of the admixture is improved, the stirring and mixing time is shortened, the concrete is more viscous and easy to form, bubbles are reduced, and the strength is further improved.

The invention belongs to the technical field of petroleum refining catalyst preparation equipment, and particularly relates to a petroleum refining catalyst preparation system. The system comprises abottom plate and a supporting plate, a stirring module is arranged above the bottom plate, the stirring module is connected with the supporting plate through a parallel connecting mechanism, the stirring module comprises a box body, a feeding port, a motor and a discharging port; the motor is arranged at the upper end of the box body, an output end of the motor is connected with a spiral plate, the lower end of the spiral plate is connected with a cam, the lower end of the spiral plate is provided with a wire rope screening net, the wire rope screening net is connected with the interior of thebox body, a first air cylinder is arranged in the wire rope screening net, the first air cylinder is in contact with the cam, a second air cylinder is arranged at the lower portion of the interior ofthe box body, the tail ends of the first and second air cylinders are in through connection through an air pipe; the feeding port is connected with a feeding hopper; a shaking plate is arranged belowthe feeding port, and the lower end of the shaking plate is arranged above the spiral plate; a discharging valve is arranged above the discharging port. According to the system, the stirring module is driven to shake in multiple directions by the parallel connecting mechanism, the shaking amplitude of the stirring module is improved, and the shaking effect is improved.

A hydrogel wound dressing The hydrogel wound dressing and a preparation method thereof belong to the technical field of medical dressings and preparation thereof. Steps: first fill the first raw material as the floating-point adhesive layer and the second raw material as the floating-point liquid-absorbing layer into the two containers of the spraying machine with matrix nozzles, and then use the matrix nozzles to spray the first, The second raw material is sprayed onto one side surface of the backing layer by dot spraying, and then irradiated by an ultraviolet lamp or heated by a heating device to form a floating-point adhesive bonded to one side surface of the backing layer by the backing layer together with molding. The attached layer and the floating-point liquid-absorbing layer constitute the core layer; the first and second release layers are combined with the core layer in a synchronous unwinding state, the first release layer is bonded to the backing layer, and the second release layer is The molded layer is attached to the floating-point adhesive layer and the floating-point liquid-absorbing layer, and then cut to obtain a hydrogel wound dressing. Significantly improved air permeability; good adhesion, excellent comfort; pain relief; significantly shortened preparation time and improved preparation efficiency.

The invention relates to a medical wastewater treatment method integrating ozone disinfection and enhanced antibiotic drug degradation, and belongs to the technical field of medical wastewater treatment. The method is carried out by adopting an integrated ozone disinfection and enhanced antibiotic drug degradation medical wastewater treatment device. The treatment device comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in the A2 / O process, and a magnetic nano ozone bubble water preparation system used for generating magnetic nano ozone bubble water; the method comprises the following steps: effluent in the A2 / O process is treated by a magnetic nano ozone bubble water preparation system to generate magnetic nano ozone bubble water; magnetic nano ozone bubble water is injected into return sludge in the A2 / O process, and the magnetic nano ozone bubble water carries the return sludge to enter the anaerobic tank, the anoxic tank, the aerobic tank and thesedimentation tank for circulation by utilizing the adhesion characteristics of magnetism and nano bubbles. Full-process disinfection and epidemic prevention of medical wastewater treatment can be realized, and antibiotic drug degradation and sludge in-situ recessive reduction are enhanced.

The invention belongs to the technical field of catalyst preparation equipment for petroleum refining, and specifically relates to a catalyst preparation system for petroleum refining, which includes a bottom plate and a support plate, and an agitation module is arranged above the bottom plate; the agitation module is connected with the support plate through a parallel mechanism; the agitation module includes a box body , material inlet, motor and outlet; the motor is set on the upper end of the box, and the output end of the motor is connected to a spiral plate; the lower end of the spiral plate is connected to a cam, and a steel wire screen is installed under the spiral plate; the steel wire screen is connected to the box, There is a No. 1 cylinder in the steel wire screen, and the No. 1 cylinder is in contact with the cam; the No. 2 cylinder is installed at the lower part of the box; the tail end of the No. 2 cylinder and the No. 1 cylinder are connected through the air pipe; the feed port is connected to the feed hopper; There is a shaking plate under the feed port, and the lower end of the shaking plate is set above the spiral plate; a discharge valve is provided on the discharge port; the invention drives the agitation module to shake in multiple directions through a parallel mechanism, which improves the shaking amplitude of the agitation module and improves the agitation efficiency. Effect.

The invention discloses a three-dimensional carbon fiber reinforced alumina-zirconia composite material and a preparation method thereof. The preparation method comprises the following steps: (1) stabilizing an alumina-zirconia composite sol; (2) under vacuum immersing a three-dimensional carbon fiber preform in the alumina-zirconia composite sol; (3) drying the impregnated three-dimensional carbon fiber preform; (4) performing heat treatment; (5) repeating the impregnation, drying, and heat treatment process from the step (2)-the step(4) for the until weight gain of a three-dimensional carbonfiber reinforced alumina-zirconia composite material intermediate is less than 1% compared with that of the three-dimensional carbon fiber reinforced alumina-zirconia composite material intermediatetreated after last impregnation, drying, and heat treatment process to obtain the three-dimensional carbon fiber reinforced alumina-zirconia composite material. The three-dimensional carbon fiber reinforced alumina-zirconia composite material has the advantages of high temperature resistance, oxidation resistance and excellent mechanical properties and the like.

The invention discloses a preparation method of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The preparation method of the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material comprises the following steps of (1) stabilizing SiO2-ZrO2 composite sol; (2) impregnatingthree-dimensional carbon fiber prefabricated members into the stabilized SiO2-ZrO2 composite sol; (3) drying the impregnated three-dimensional carbon fiber prefabricated members; (4) performing thermal treatment; (5) repeating the impregnation-drying-thermal treatment process in the steps of (2) to (4) until the weight gain rate of a three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material intermediate in a current impregnation-drying-thermal treatment process relative to a previous impregnation-drying-thermal treatment process is smaller than 1% to obtain the three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material. The prepared three-dimensional carbon fiber-reinforced silicon dioxide-zirconium dioxide multiphase ceramic composite material has the advantages of being high in high-temperature resistance and antioxidant and mechanical performance and the like.

The invention discloses a lignin-based superhydrophobic coating and a preparation method thereof. The lignin-based superhydrophobic coating comprises the following raw material components in parts by mass: 2 to 4 parts of covalently crosslinked lignin micro-nano ball, 2-3 parts of trimethoxy (1H,1H,2H,2H-tridecafluoro-n-octyl) silane, 1-2 parts of epoxy resin, 1-2 parts of curing agent. The preparation method comprises: preparing covalently cross-linked lignin micronanosphere suspension, preparing low surface energy lignin micronanosphere suspension, preparing superhydrophobic adhesive prefabricated solution and coating film. The lignin-based superhydrophobic coating of the present invention has the advantages of low cost, environmental protection, and excellent superhydrophobic performance. It is a new type of superhydrophobic material with good use value and application prospect. It has the advantages of mildness and low cost, conforms to the concept of green chemistry, is suitable for large-scale preparation, and is convenient for industrial application.