34results about How to "Preparation to meet" patented technology

The invention relates to a preparation method of an acrylic resin used in the paint and printing ink industry, in particular to a preparation method of a solid acrylic resin. Add hard monomers, soft monomers, functional monomers, initiators, chain transfer agents and auxiliary components into the reactor for polymerization; when the total conversion rate of the above-mentioned monomers in the reactor is 40-50% When starting to drop the diluted solvent into the reactor gradually to reduce the viscosity until the total conversion rate of the above-mentioned monomers reaches 70-80%, the resulting dilution is discharged from the reactor into the storage tank; then The dilution is continuously poured into the tubular reactor from the storage tank to carry out the polymerization reaction; the reaction product enters the devolatilization tower after coming out of the tubular reactor, and the solid acrylic resin after removing the diluted solvent is discharged from the devolatilization tower. The lower portion was discharged to obtain a solid acrylic resin. The invention overcomes the disadvantages that bulk polymerization is easy to produce detonation phenomenon and the polymerization temperature is difficult to control, and improves the utilization efficiency of equipment.

The invention discloses a supercritical-solvent heat combined device and a method for preparing a nanometer material. The device comprises a carbon dioxide steel bottle, a carbon dioxide cooler, a carbon dioxide pump, an entrainer accommodator, an entrainer pump, a first valve, a second valve, a third valve, a secondary reactor, a fourth valve, a main reactor, a fifth valve and a separator. The device can realize a plurality of supercritical-solvent heat combined preparation methods, and can satisfy the preparation of the nanometer material and the demands of controlling such crystal growth behaviors as crystal transfer, grain size and morphology evolution of an inorganic nanometer material through splicing pipelines and modules and adjusting such conditions or parameters as valve switch combinations, raw material placing mode and entrainer entering mode. The device has such advantages as simplicity and convenience for operation, wide adjusting range of experimental parameters, strong stability and high productivity, has huge application potential in the research, preparation and application fields of the nanometer material, and has wider industrialization foreground.

The present invention relates to a kind of SiC whisker and C-AlPO 4 The preparation method of powder synergistically modified mullite coating, selects C / SiC composite material as the substrate, prepares SiC inner coating by chemical vapor deposition method, and then uses sol- Preparation of SiC Whiskers and C‑AlPO by Gel Combined with Air Spray Process 4 Powder synergistic modification of mullite coating precursor, and finally SiC whiskers and C-AlPO can be obtained by sintering 4 Powder synergistic modification of mullite coatings. This method improves the shortcomings of the coating prepared by the traditional sol-gel process, such as easy cracking, uneven distribution, and low bonding strength, and can meet the control of micron-level coating thickness. It has the advantages of simple preparation process, low preparation cost and high preparation efficiency. , can meet many advantages such as the preparation of large-scale components and heterogeneous components, is convenient for large-scale industrial application, and has broad development prospects.

The invention discloses a method for separating and preparing a caftaric acid standard product in a vitis davidii juice by using high-speed countercurrent chromatography. The method comprises the following steps: enriching the vitis davidii juice by using macroporous adsorption resin, eluting the material with ethanol, performing freeze-drying to obtain a crude sample, and performing high-speed countercurrent separation on the crude sample through solvent system water. The invention establishes the method for separating a polyphenol monomer in the vitis davidii juice by the high-speed countercurrent chromatography, and the method identifies the seperated monomer as caftaric acid by the methods such as HPLC-MS and nuclear magnetic resonance. The caftaric acid has an important pharmacological function, and its standard product is expensive, and the caftaric acid prepared by the method of the present invention has a purity of 95.8% and a calculated yield of 61.99 mg / L. The method of the high-purity standard product prepared can satisfy the large-scale preparation of caftaric acid of vitis davidii.

The invention discloses a crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device. The objective of the invention is to solve the problems of difficulty in height-width ratio control, silver slurry waste and high scrap rate in screen printing. The crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device comprises a vertically-arranged sprayer cylinder body, a sprayer mounted at the lower end of the sprayer cylinder body, and a sprayer end cover mounted at the upper end of the sprayer cylinder body; a piston is arranged inside the sprayer cylinder body; a piston rod fixed on the upper end of the piston penetrates the sprayer end cover; the piston is in interference fit with the sprayer cylinder body; a plurality of nozzles are formed in the sprayer; and the diameter of the spraying opening of each nozzle is in a range of 20 micron to 30 micron. With the crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device of the invention adopted, n auxiliary grids can be prepared at a time, wherein the n=1, 2, 3..., and therefore, photoelectric conversion efficiency can be improved, and cost can be reduced, and problems existing in maintenance and scale production can be solved, and a foundation can be laid for full automation of solar cell sheet production lines. The crystalline silicon cell extrusion type ultrafine auxiliary grid preparation device can adapt to the development direction of thinning in the future.

The invention discloses a hot stamping mold for a soft magnetic alloy element and a preparation method thereof, wherein the mold includes an upper mold base and a lower mold base, and the upper mold base and the lower mold base are provided with mutually matching convex molds and concave molds, and the concave mold Including the lower mold body and the lower mold core, the punch includes the upper mold body and the upper mold core, the lower mold body has a graphite coating, and the outer surface of the graphite coating has an induction coil; the lower mold body corresponds to the position of the lower mold core, And there are cooling chambers in the position facing the upper mold core in the upper mold body, and the corresponding cooling chambers on the lower mold body and the upper mold body are equipped with inlets and outlets communicating with them. The preparation method mainly adopts the above-mentioned molds, through structural cooperation such as rapid heating and cooling, combined with measures such as heat preservation and pressure preservation. It can effectively increase the heating rate, cool down in time and ensure a stable cooling gradient, which can meet the preparation of complex structural components, and at the same time help to ensure the continuity of the internal grain structure of the finished soft magnetic alloy component, maintain good magnetic permeability, and improve the quality of the finished product .

The invention discloses a molding preparation method for a tackified preform of a fiber layered-connection structure. According to the molding preparation method for the tackified preform of the fiber layered-connection structure, the tackified perform is woven according to a mold through a knitting method. The molding preparation method for the tackified preform of the fiber layered-connection structure is applicable to preparation of the tackified perform which is high in thickness, large in size and complex in shape; the molding preparation method ahs the advantages of being great in structural design performance, good in tackified perform homogeneity, excellent in mechanical property, high in fiber volume fraction, complete in block construction, continuous in yarn bundle, stable and controllable in dimension, high in preparation precision and suitable for preparing tackified perform complex in shape.