30results about How to "Reduce the degree of decomposition" patented technology

The invention relates to a triene antibiotic. The formula of the triene antibiotic is C23H34O8S and the structural formula of the triene antibiotic is as follows. The preparation method comprises steps of using Shandong streptomycetes to cultivate a fermentation broth, performing centrifugation for the fermentation broth, removing thallus, reserving supernatant liquor, preprocessing the supernatant liquor by using a macroporous resin X-5 column chromatography, preprocessing the supernatant liquor by using a macroporous resin HP-20 column chromatography, performing High Performance Liquid Chromatography (HPLC) semi-preparation liquid phase separation, performing freezing and drying after rotating, evaporating and concentrating collection liquid corresponding to peaks of active constituents, and obtaining required purified products. Accordingly, products which have high purity and little impurity can be obtained. Under the same concentration, the triene antibiotic has a large-diameter inhibition zone and good inhibitory effects.

The invention belongs to the technical field of the spent fuel reprocessing and discloses a device for continuously destructing a radiative waste organic solvent. The device comprises a constant-temperature tank and an electrochemical oxidation destruction container located in the constant-temperature tank; the container is mainly composed of an anode chamber, a cathode chamber and a clarifying chamber; the radiative waste organic solvent goes into the clarifying chamber by use of a waste organic solvent feeding pipe; when the solvent is higher than a separator between the clarifying chamber and the anode chamber, the solvent goes into the anode chamber. The non-destructed waste organic solvent is mixed with water into a mixed solution which goes into the clarifying chamber by use of a liquid flow channel between the anode chamber and the clarifying chamber, the separation of the organic phase and the water phase is realized in the clarifying chamber, and the water phase located below contains redionuclides and is charged by use of a water phase drainage pipe at a certain rate; besides, the organic phase located at top is mixed with the waste organic solvent added by use of the waste organic solvent feeding pipe and then the mixture flows into the anode chamber by use of the upper channel of the separator. The device is capable of meeting the requirements on improving the current effectively and realizing continuous destruction of waste organic solvents.

The present invention first prepares exchange salt, adopting silver nitrate and potassium nitrate mixture, wherein the mass ratio of silver nitrate and potassium nitrate being 1: 8-1 : 10, uniformly stirring, preliminary drying waveguide piece and prepared salt in far infrared oven for removing moisture, then heating up to 350 degree centigrade, to proceed ion exchange by putting waveguide piece in melting salt, taking out waveguide piece and natural cooling, whole process being processed on lucifugal condition. The present invention reduces silver nitrate extent decomposition, raising waveguide surface ionic exchange quality, thereby improving made Erbium waveguide amplifier surface quality.

The purpose of the present invention is to provide a conductive coating film formed on an insulating substrate using a copper paste and having excellent conductivity and adhesiveness to the insulating substrate. This method of producing the conductive coating film involves a step for forming a coating film on the insulating substrate using a copper paste which has a copper powder, a binder resin and a solvent as the main components, and drying the same to obtain a copper powder-containing coating film, a step for treating said copper powder-containing coating film with an organic acid or organic acid salt, and a step for heat-treating the copper powder-containing coating film with superheated steam. This method enables obtaining a conductive coating film with excellent conductivity and also with excellent adhesiveness to the insulating substrate.

The invention relates to the technical field of polymer materials, in particular to a polypropylene consumable for 3D printing and a preparation method thereof. The polypropylene consumables for 3D printing of the present invention are composed of polypropylene, thermoplastic elastomer, talcum powder masterbatch, maleic anhydride grafted polypropylene, antioxidant, lubricant, hyperdispersant and color masterbatch. In the present invention, thermoplastic elastomer is added to polypropylene to increase the toughness of the composite material; talcum powder masterbatch is added to reduce product cost and crystallization and shrinkage of matrix resin, and improve the forming precision of 3D printing; adding maleic anhydride grafted polypropylene to improve matrix resin The binding force with talcum powder; adding compound antioxidants can reduce the aging and decomposition of materials during the extrusion process, prolong the service life of the product, and interact with each auxiliary material to reduce shrinkage and improve anti-aging ability at the same time The result is that the obtained polypropylene consumables for 3D printing are not easy to crystallize, have good toughness, small shrinkage after molding, and strong anti-aging ability.

The invention discloses a determination method for OCPs in an environmental sample, which belongs to the field of detection of OCPs. The determination method comprises the following steps: carrying out Soxhlet extraction on a to-be-determined environmental sample so as to obtain a liquid extract containing OCPs; carrying out separation and purification, i.e., concentrating the liquid extract to a constant volume, adding an aqueous solution of tetrabutyl ammonium sulfite and isopropanol, carrying out oscillation until a solid residue is generated after repeated shaking every time, discarding a lower layer, retaining an organic phase, washing the organic phase, removing water by using anhydrous sodium sulfate, carrying out purification by using a Florisil column so as to obtain an eluate, concentrating the eluate to a constant volume and dividing the concentrated eluate into two groups which are used as samples for subsequent detection, wherein one of the groups is a sample of OCPs stable in sulfuric acid and is purified by using a sulfuric acid silica gel column so as to obtain a purified sample, and the other of the groups is a sample of OCPs instable in sulfuric acid and is purified by using an Envi-carb SPE small column so as to obtain a purified sample; and carrying out determination, i.e., respectively analyzing and determining the two groups of purified samples by using an HRGC-HRMS apparatus so as to obtain determination results of the content of OCPs in the two groups of purified samples. The determination method provided by the invention enables accuracy and sensitivity of determination to be improved.