33results about How to "Long synthesis time" patented technology

The invention discloses a method for producing phospholipase D through recombinant escherichia coli. According to the method, a phospholipase D gene is in preciseness-type starting sub control, a pararea of pSC101 is inserted in an expression plasmid, an escherichia coli mutant strain recA is used for keeping the genetic stability of the plasmid, cells containing the plasmid at the growth periodare cultured to high density, and saturation induction is conducted at the induction period; meanwhile, the temperature is decreased, alkali metal salt stress is applied, the cytotoxicity of PLD to ahost is reduced, cell lysis is inhibited, the synthesis time of PLD is prolonged, and accordingly PLD expression is improved.

The invention discloses a production method of tartary buckwheat sprouts, which comprises the steps of disinfection, germination acceleration, seed soaking, intermittent microwave treatment, alternate dark light cultivation, etc., and uses salt stress to significantly increase the germination rate of seeds and promote flavonoids in sprouts The synthesis and enrichment of rutin and other flavonoids are beneficial to the synthesis and enrichment of flavonoids such as rutin, and the germination rate of tartary buckwheat seeds is improved by using intermittent microwave treatment to effectively avoid enzyme inactivation caused by high temperature. The content of flavonoids and antioxidant capacity; the allelopathic effect of the water extract of Artemisia annua can inhibit the growth of tartary buckwheat sprouts, prolong the time from germination to harvest, and increase the synthesis time of beneficial substances. Sprouts synthesize a large amount of flavonoids per unit time, which significantly increases the total content of beneficial substances in sprouts. After inhibiting the growth of root hairs, the workload of root hair removal can be reduced, the proportion of harvestable parts can be increased, and production efficiency can be increased.

The industrial preparation method of silicon carbide whiskers and micrpowder is characterized by that the graphite and other industrial carbon and silicon raw materials are mixed, and placed into industrial SiC smelting furnace to make synthesis reaction, the graphite is used as conductive heating body to prepare silicon carbide whiskers and micropowder. Said preparation method is simple, the diameter of whiskers produced by said invented method is uniform, and length-diameter ratio is large and the heteromorphous crystal is less, and product quality is high.

The invention provides silicon iron nitride microwave-synthesizing method, using silicon iron as raw material for microwave synthesis, grinding silicon iron ore into powder with particle size smaller than 0.5mm, placing the silicon iron powder into a microwave synthesis reaction cavity, adding ammonium-containing additive by 5% of the raw material, uniformly mixing, where microwave frequency is 300MHz-300GHz, pressure is 0.1-0.12MPa and synthesis temperature is 800-1800 deg.C, inputting nitrogen gas for microwave synthesis for 0.5-3 hours, and cooling the synthetic to obtain the finished product silicon iron nitride. The invention couples special wave band of the microwave with basic structure of the material to produce heat to heat in a mode of heating the material by its medium loss, and has the advantages of low synthesis temperature, short synthesis time, low energy consumption, etc.

The invention discloses a preparation method of branched polyethyleneimine and a shale intercalation inhibitor prepared from the branched polyethyleneimine. The branched polyethyleneimine is preparedby the following steps: S1. synthesizing aziridine; S2. with a polyamine compound and the aziridine as raw materials, preparing the branched polyethyleneimine by a stepwise synthesis process or a one-pot synthesis process, wherein the polyamine compound is polyethylene polyamine or alkylamine; the polyethylene polyamine is one of diethylenetriamine, triethylene tetramine, tetraethylenepentamine and pentaethylenehexamine; the alkylamine is one of ethylenediamine, propane diamine, butanediamine, pentamethylene diamine, nonamethylene diamine and decamethylene diamine. The shale intercalation inhibitor is prepared by proportionally mixing the branched polyethyleneimine with water. The branched polyethyleneimine synthesis method provided by the invention has the advantages of high yield and cheap raw materials and is suitable for large-scale industrial production; the shale intercalation inhibitor prepared from the branched polyethyleneimine can effectively alleviate the problem of unstableborehole wall caused by the hydration dispersion of shale.

The invention discloses fully synthetic cutting fluid with high abrasion resistance and high antirust performance and a method for preparing the fully synthetic cutting fluid, and belongs to the technical field of technological lubrication. By the aid of the fully synthetic cutting fluid and the method, the problems of poor universality, short user cycles, vulnerability to decaying and deterioration and severe pollution of the traditional cutting fluid mainly can be solved. The fully synthetic cutting fluid comprises, by weight, 0.50%-1.00% of disodium tetraborate decahydrate, 1.00%-2.00% of extreme-pressure agents, 0.02%-0.10% of defoaming agents, 0.08%-0.15% of 1, 2, 3-benzotriazole, 0.50%-1.50% of polyethylene glycol, 1.00%-2.00% of synthetic additive components A and the balance deionized water. The synthetic additive components A in the fully synthetic cutting fluid are multi-effect additives, and oleic acid and triethanolamine are synthesized according to a mass ratio of 1.8-2.0under the condition of constant temperatures ranging from 60 DEG C to 80 DEG C for 3-6 h to obtain the multi-effect additives. The fully synthetic cutting fluid and the method have the advantage thatthe fully synthetic cutting fluid not only is applicable to common cutters, but also is applicable to hard aluminum alloy cutters, can be used for machining diversified materials at high and low speeds and particularly can be used for machining cast iron, carbon steel, stainless steel and the like at high and low speeds.

The invention belongs to the technical field of diamond synthesis, and provides a pedestal assembly for preparing diamond. The pedestal assembly comprises a water cooling table and a substrate support arranged on the water cooling table. The water cooling table is tightly connected with the substrate support. Annular grooves are formed in the upper and lower surfaces of the portion, close to the outer edge, of the substrate support, and an upper thermal bridge and a lower thermal bridge are formed correspondingly. A heat conducting gasket is arranged between the water cooling table and the substrate support and located on the outer ring part of the portion, with the lower thermal bridge as the boundary, of the lower surface of the substrate support.

The invention discloses a method for preparing cobalt tetroxide doped with a rare earth element. In the method, the rare earth element is mixed into a cobalt solution, and as the synthesis time prolongs, the concentration of the cobalt solution added to the reactor increases or decreases in a gradient manner. At the same time, the solid-to-liquid ratio of the slurry in the reactor is adjusted, and evenly doped cobalt hydroxide is synthesized by wet method. After the synthesis is finished, the synthesized product is washed, dried, and calcined to obtain a product doped with rare earth element tricobalt tetroxide with large particle size or small particle size. Using this process, it is possible to prepare cobalt tetroxide products doped with La, Ce, Y, doping amount uniformly distributed, and spherical or quasi-spherical in shape.