34results about How to "Prepared for" patented technology

The invention discloses a warm mix agent, SBS / SBR modified warm mix asphalt mixture and a preparation method thereof, belonging to the technical field of road construction. The warm mix agent includes aromatic hydrocarbon oil, slaked lime and quaternary ammonium salt surfactant; modified warm mix asphalt includes base asphalt, SBS or SBR, and the aforementioned warm mix agent; modified warm mix asphalt mixture includes modified warm mix asphalt , aggregates, mineral powder and natural asphalt. The warm-mix asphalt mixture of the present invention ensures high and low-temperature performance while lowering the mixing and molding temperatures by more than 35°C compared with similar hot-mix asphalt mixtures, reducing energy consumption and reducing the emission of harmful gases. Conducive to environmental protection.

The invention provides a preparation method of a tantalum carbide ceramic precursor. The method includes the steps of performing pre-reactions to a tantalum source compound TaX5 (X is Cl, Br or I) successively with an amido lithium compound and aminated lithium, each having two N-Li bonds, at room temperature; and heating the system to perform a reaction to obtain the tantalum carbide ceramic precursor. The preparation method is low in cost and has simple processes. The tantalum carbide ceramic precursor is suitable for preparing a tantalum carbide ceramic material.

The invention discloses a preparation method of a hepatitis drug intermediate, which is characterized in that m-fluoroaniline is used as a starting material, and after acetylated amino protection, Friedel-Crafts acylation reaction, nitration reaction, bromination reaction, and finally coupling to obtain 1,4‑bis‑[(4‑acetamido‑2‑fluoro‑5‑nitro)phenyl]butane‑1,4‑dione. The present invention has easy-to-obtain raw materials, low requirements on reaction conditions, few side reactions, and high yield. 1,4-bis-[(4-acetamido-2-fluoro-5-nitro)phenyl]butane-1,4 -Diketones can be used as pharmaceutical intermediates for the preparation of pirentasvir.

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 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 discloses a method for preparing YAG-based multilayer composite structure transparent ceramics by using Isobam gel injection molding. The prepared multilayer ceramics satisfy the structure shown in the following formula: YAG / Re:YAG / YAG or YAG / Re: YAG / Re:YAG, where the YAG layer consists of Y 3 A1 5 o 12 Composed of, the Re:YAG layer consists of (Y 1‑x Re x ) 3 A1 5 o 12 Composition, 0.02≤x≤0.2; Re is one of the rare earth elements cerium, praseodymium, neodymium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium or ytterbium; first prepare the slurry for Isobam gel injection molding, Then the slurry is defoamed and poured into the mold, the first layer of slurry is solidified and then poured into other layers of slurry, after complete gelation, it is dried and deglued; the green body after degumming is vacuum sintered After annealing and double-sided polishing, it is a multi-layer composite structure transparent ceramic. The method provided by the invention mainly uses water-based slurry, which is green and environmentally friendly. The prepared ceramics have the characteristics of high density, complex structure, good optical quality, high transmittance, and small interface ion diffusion range. Preparation of composite structure YAG-based transparent ceramic materials.

The invention discloses a method for preparing a paper base material through a needle broad-leaved mixed sulfate pulp total-chlorine-free bleaching chemical pulp. The method comprises the following steps of (1) using a needle broad-leaved mixed pulp obtained by bleaching through a biochemical method as a paper pulp raw material, dividing the paper pulp raw material into three parts, and respectively pulp-beating, wherein the pulp-beating degree of the first paper pulp ranges from 15 to 25 degrees SR, the pulp-beating degree of the second paper pulp ranges from 45 to 55 degrees SR, and the pulp-beating degree of the third paper pulp ranges from 60 to 75 degrees SR; (2) mixing the three paper pulps prepared in the step (1) according to a certain proportion so as to obtain a mixed pulp, and enabling the mass ratio of the first paper pulp, the second paper pulp and the third paper pulp in the mixed pulp to be 10 to 30:65 to 85:10 to 20; (3) mixing moulding or compression moulding the mixed pulp obtained the step (2) so as to obtain the paper base material. According to the method provided by the invention, a gradient pulp-beating method is adopted, and paper pulp fibers with different pulp-beating degrees are mixed, so that the paper base material can be ensured to have a favorable drainage property during a preparation process, and the prepared paper base material has higher strength.

The invention belongs to the field of biotechnology, and specifically discloses the application of the rhodococcus equi pathogenic gene VapA recombinant protein in the preparation of preparations for treating or detecting rhodococcus equi disease, characterized in that the rhodococcus equi pathogenic gene VapA recombinant protein is The amino acid sequence of MBP‑VapA with MBP tag is shown in SEQ ID NO: 1, and almost all of the obtained recombinant protein exists in the form of soluble expression. The recombinant protein has good immunogenicity and is suitable for the development of biotechnology products such as hyperimmune serum antibodies for clinical treatment, vaccines, and clinical diagnostic reagents.