34results about How to "Prepared for" patented technology

The invention discloses a method for preparing a YAG-based multilayer composite transparent ceramic by using Isobam gelcasting. The prepared multilayer ceramic satisfies a structure shown by a following formula: YAG/Re:YAG/YAG or YAG/Re: YAG/Re:YAG, wherein the YAG layer is composed of Y3A15O12, the Re:YAG layer is composed of (Y<1-x>Re<x>)<3>A<15>O<12>, x is more than or equal to 0.02 and is lessthan or equal to 0.2; Re is one of rare earth elements of cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium or ytterbium. The method comprises the steps that firstly Isobam gelcasting slurry is prepared, then the slurry is defoamed and is cast into a mold, after a first layer of the slurry gel is cured, the other layer of slurry is poured, the slurry is completely gelled, drying treatment is conducted, and the gel is discharged; biscuit after discharging the gel is vacuum sintered and annealed, and after double-sided polishing, the multilayer composite transparent ceramic is obtained. The method provided by the invention is mainly water-based slurry, green and environmentally friendly, and the obtained ceramic has the characteristics of high density, complicated structure, good optical quality, high transmittance, small interfacial ion diffusion range, and the method is very suitable for the preparation of the large size and composite YAG-based transparent ceramic material.

The invention discloses a silicon-boron-carbon-nitrogen-zirconium ceramic composite material and a preparation method thereof. A sol-gel liquid adopts zirconium n-propoxide, acetylacetone and anhydrous ethanol as raw materials. Zirconium n-propoxide is the precursor of zirconium oxide, and can be subjected to a gel reaction with acetylacetone, while ethanol is a solvent. Silicon powder, graphite and hexagonal boron nitride are the raw materials for silicon-boron-carbon-nitrogen ceramic composite powder. The preparation method comprises the following steps: zirconium n-propoxide and acetylacetone are subjected to magnetic stirring for 48h in an anhydrous ethanol solution, such that a gel solution is formed; the silicon-boron-carbon-nitrogen ceramic composite powder is mixed with the solution according to a certain ratio; magnetic stirring is carried out for 48h, and the obtained material is dried; cracking is carried out for 3h under a temperature of 550 DEG C in a tubular furnace, such that a silicon-boron-carbon-nitrogen-zirconium oxide ceramic composite material is obtained. The powder is subjected to pressurized sintering under a temperature of 2000 DEG C in discharge plasma, such that in-situ reaction sintering is carried out. The silicon-boron-carbon-nitrogen-zirconium ceramic composite material synthesized with the method provided by the invention has the advantages of high interfacial bonding strength and good comprehensive performance. The material is especially suitable to be used for manufacturing aerospace heat-proof core components.

The invention relates to a polymer electrolyte, especially relates to a micropore polymer electrolyte skeletal material prepared by a coaxial electrospinning technology and a method for preparing a gel polymer electrolyte from the skeletal material, and belongs to the field of polymer lithium ion batteries. The preparation method comprises the following steps of 1, preparing core and shell layer electrostatic spinning solutions, 2, preparing a core/shell structure nanometer fiber film by a coaxial electrospinning technology, 3, drying and cutting the nanometer fiber film, and carrying out lamination to obtain a polymer gel electrolyte skeleton, and 4, putting the skeleton into an electrolyte in a glove box and carrying out activation and gelation. The electrolyte skeleton has ultra-strong electrolyte adsorptivity and retentivity. The prepared gel polymer electrolyte has high ion conductivity, a stable electrochemical window, good charging and discharging performances and good interface compatibility with a lithium electrode, satisfies common button cell assembling requirements and can be used for preparation of a secondary lithium ion battery.

The invention relates to a preparation method of a nano-hydroxyapatite/nano-hydroxyapatite gas sensing material. The preparation method comprises the following steps: first, preparing a graphene oxide dispersion liquid by an ultrasonic method; preparing hydroxylated modified graphene through reduction and modification of a mussel foot fibronectin analogue; in-situ reducing nucleation and growth of nucleation by a chemical precipitation method; and centrifugalizing, washing and drying to obtain the nano-hydroxyapatite/nano-hydroxyapatite gas sensing material. A gas sensor element can be prepared by the following steps: preparing the obtained gas sensing material with a binder to slurry; coating the slurry on a base body with an electrode; and then, sintering and welding for 3 hours at 300 DEG C under a nitrogen protective atmosphere.

The invention discloses a continuous preparation method of a foam material. A foaming agent filling process, a heating process and a foaming process are carried out on a material to be foamed in a first reaction area, a second reaction area and a third reaction area correspondingly. First pressure is exerted on the material to be foamed in the second reaction area, bubbles in the material to be foamed do not grow during heating, and expanding foaming of the material during uneven heating is avoided. Through conveying to the third reaction area from the first reaction area, continuous preparation of the foam material can be achieved. The invention discloses a foaming pretreatment device applying the method. In the conveying process, the material to be foamed is evenly heated to a foaming temperature under the condition that the internal bubbles do not grow, instant foaming is carried out after the material to be foamed leaves the foaming pretreatment device, and the foam material has uniform and controllable hole diameters and foaming ratios. The invention discloses a foaming device. The foaming device comprises the foaming pretreatment device. The foaming device is suitable for continuously preparing the foam material with uniform bubble hole diameters and large thicknesses in a solid foaming process.

The invention discloses nitrogen-doped grapheme and a preparation method. The method comprises the following steps: preparing graphene oxide; adding deionized water to graphene oxide, carrying out ultrasound treatment and centrifugation to obtain a graphene oxide dispersion, adding urea I into the graphene oxide dispersion, carrying out ultrasound treatment, and then placing in a reaction kettle to obtain nitrogen-doped grapheme I, wherein the reaction temperature is 160 DEG C and the reaction time lasts for 3 hours; adding melamine to absolute ethyl alcohol to obtain a mixture, mixing the mixture with the graphene oxide dispersion, then placing in a high pressure reaction kettle to obtain nitrogen-doped grapheme II, wherein the reaction temperature is 180 DEG C and the reaction time lastsfor 8 hours; mixing the graphene oxide dispersion, calcium chloride and oxalic acid powder in an ultrasound treatment manner, dissolving thioacetamide in deionized water, mixing the two in the ultrasound treatment manner to obtain a mixture, vibrating the mixture in the ultrasound treatment manner for 1 hour, and heating by an electromagnetic furnace to obtain nitrogen-doped grapheme III, whereinthe reaction temperature is 80 DEG C and the reaction time lasts for 6 hours. The nitrogen-doped graphene prepared according to the preparation method provided in the invention has the advantages that the quality is relatively high, defects are reduced, and the comprehensive performance of the nitrogen-doped graphite is improved.

The invention discloses a preparation method for high softening point polyborosilazane, which comprises the following steps: (1) a reaction still provided with a stirring device, a temperature measurement device, a charging device, a ventilation device, a discharging device, and a distillation device is used for replacement of nitrogen; (2)chlorosilane, dialkyl group borazine and heptamethyldisilazane are weighed according to the molar ratio of 1:(0.5-3):(6-12); (3) chlorosilane, dialkyl group borazine and heptamethyldisilazane are added into the reaction still, and the reaction still is cooled to 5-55 below zero DEG C; the heptamethyldisilazane is added into a reactor at the speed of 0.01-0.2L/min and is stirred; (4) after the charging is completed, the reactor is heated to reach 250-350 DEG C and is distilled for 6-48 hours under the normal pressure; (5) after the distillation under the normal pressure is completed, the temperature of the reactor is reduced by 10-60 DEG C and is subjected to reduced pressure distillation for 0.3-3 hours. The softening point of polyborosilazane is synthesized by the method is greater than 180 DEG C, the ceramic yield is more than 60 percent, and high performance ceramic fiber and ceramic matrix can be prepared.

The invention relates to a temperature-sensitive hollow polylactic acid color changing microsphere as well as a preparation method and application thereof. The microsphere comprises polylactic acid, color changing ink and polyvinyl alcohol. The preparation method comprises the following steps of preparation of polylactic acid solution, preparation of color changing ink suspension, preparation of polyvinyl alcohol solution and preparation of the polylactic acid microsphere. The preparation method has the advantages of being high efficiency, feasible and suitable for the preparation of large-scale monodisperse functional hollow microspheres.

The invention relates to a fluorine label and a preparation method thereof, and a method for synthesizing an oligosaccharide chain by adopting an assisted enzyme method. The structural formula of the fluorine label is G-R(I) as shown in the formula I. G represents monosaccharide or oligosaccharide; and R is one of the following formulas II and III, wherein R1 is one of C6H13 and C8H17. When G represents lactose and R represents a C8F17 difluoro chain, the formula II is shown in the specification. The fluorine label has the advantages of being easy to remove and recycle. The glycosyl receptor is used for synthesizing various different oligosaccharide chains, so that the oligosaccharide chain with a determined structure is quickly and efficiently synthesized.

The invention relates to a method for preparing a nanocomposite fiber by using grooved-type water gel. The composite fiber is obtained by adopting grooved-type water gel prepared through a 3D printingmethod as a coagulation bath and combining a microfluidic method in wet spinning. The method for preparing the nanocomposite fiber is novel and simple; and a plurality of nanocomposite fibers with high strength and good weaving property employing sodium alginate (SA) as a matrix can be prepared and can be applied to intelligent clothing industry and the like. By using the water gel as the coagulation bath, the fiber preparation efficiency of traditional wet spinning is improved and the service life of the coagulation bath can be prolonged.

The invention belongs to the biotechnical field, and particularly discloses an application of a rhodococcus equi virulence gene VapA recombinant protein to preparing a preparation for treating or detecting rhodococcus equi. The application is characterized in that the rhodococcus equi virulence gene VapA recombinant protein is MBP-VapA with an MBP label, wherein an amino acid sequence of the recombinant protein is as shown in SEQ ID NO: 1; the obtained recombinant protein almost exists in a soluble expression form. The recombinant protein has good immunogenicity, and is suitable for developing biotechnical products such as hyper-immune serum antibodies for clinical treatment, vaccines, clinical diagnosis reagents and the like.

The invention belongs to the technical field of materials and provides a method for preparing (Y1-xYbx)AG transparent ceramic from monodisperse spherical Y2O3 and Al2O3 powder. According to the methodprovided by the invention, monodisperse spherical Al2O3 powder is prepared by adopting a homogeneous co-precipitation method; the monodisperse spherical Al2O3 powder, prepared monodisperse sphericalY2O3 powder and nano Yb2O3 powder are mixed to obtain a raw material; a solid-phase reaction method, a pressing and molding technology and a vacuum sintering technology are used for treating the raw material to prepare Yb:YAG transparent ceramic. The prepared Y2O3 powder and the prepared spherical Al2O3 powder have uniform grains and good dispersity; a preparation technology is simple; when the powder is molded, a blank has high density and is easily sintered to prepare laser transparent ceramic; the method provided by the invention has the advantages of simple reaction conditions, small environment pollution, easiness for popularization and the like.

The invention discloses a preparation method of a hepatitis drug intermediate, which is characterized in that m-fluoroaniline is used as an initial raw material, and subjected to acetylation amino protection, a Friedel-Crafts acylation reaction, a nitration reaction and a bromination reaction, and finally coupling is performed to obtain 1,4-bis-[(4-acetamido-2-fluoro-5-nitro)phenyl]butane-1,4-dione. According to the method, the raw materials are easy to obtain, the reaction condition requirements are low, side reactions are few, the yield is high, and the 1,4-bis-[(4-acetamido-2-fluoro-5-nitro)phenyl]butane-1,4-dione can be used as a drug intermediate for preparing pibrentasvir.

The invention belongs to the technical field of fine chemical industry, and mainly relates to a method for preparation of a nitrocompound by use of nitrogen tetroxide/ ozone as a nitrating agent; the method comprises the following steps: reaction raw material chlorobenzene, a solvent and a solid catalyst are added into a reactor; ozone and nitrogen tetroxide are introduced for reaction for 7-10h in the 0.011.5MPa and at 50 to 100 DEG C. After the reaction, the temperature is cooled to room temperature, oxygen is introduced into the reaction mixture until nitrogen oxides completely escape from the reactor, and the catalyst is filtered out. The filtrate is washed to neutral with sodium carbonate solution, an organic phase is washed, and vacuum rotary evaporation and concentration is performed.