81results about How to "High and stable yield" patented technology

The invention relates to a preparation method of hydrocortisone acetate or an analogue thereof. Hydrocortisone acetate or the analogue thereof has a structural formula represented as a formula VIII. According to the invention, a compound I is subject to an oxidation reaction, a carbonyl protection reaction, a reduction and hydrolysis reaction, a cyano substitution reaction, a silicon alkyloxy protection reaction, an intramolecular nucleophilic substitution reaction, and a substitution reaction, such that hydrocortisone acetate or the analogue thereof is prepared. The initial raw materials are easy to obtain, and the yield is high and stable. The compound I is represented by a formula I, wherein R is H or alkyl.

The invention discloses a method for producing a squatting pan by high-pressure molds. A horizontal high-pressure grouting forming device is used for producing the squatting pan. The high-pressure grouting forming cycle includes the following steps of (1) grout filling, (2) grouting, (3) grout returning and (4) strengthening, wherein in the step of (1) grouting filling, grout is conveyed to the molds through a pneumatic diaphragm pump, in the step of (2) grouting, external pressure acts on the grout in the molds so that the grout can be dehydrated and hardened to be shaped, in the steps of (3) grouting returning, extra grout in a hollow grouting area of a blank is discharged, and in the step of (4) strengthening, compressed air is led to an inner cavity of the blank, so that water in the blank is uniform, and the strength of the blank is improved. The micro-reticular resin mold is adopted, the device is in a horizontal pouring mode, and a reliable guarantee is provided for demolding of the blank, and accordingly the blank is not prone to deforming; the device is of a double-mold structure, multiple high-pressure resin molds can be arranged, and the device can be used for producing wash basins and also can be used for producing squatting pans by replacement of the molds; according to the method, energy conservation and emission reduction can be achieved, clean production can be achieved, the qualified rate of products and production efficiency are greatly improved, and meanwhile, work intensity of workers is greatly reduced.

The invention discloses a stainless steel material and manufacturing methods thereof. The stainless steel material is Cr-Mn-N austenitic stainless steel with nickel replaced with nitrogen. The manufacturing methods comprise a smelting method, a blank punching method and a machining method. The smelting method mainly comprises the step of smelting high-nitrogen steel through two alloying nitrogen-increasing methods, namely using nitrogen-containing materials and gaseous nitrogen. The blank punching method mainly comprises the steps of conducting circulative blank punching, conducting heat treatment, conducting solid solution treatment, and controlling the heat retention temperature and heat retention time, wherein hardness values and impact toughness values serve as the main reference for die selection. The machining method mainly comprises the steps of controlling appropriate machining parameters of milling and turning. The stainless steel material and the manufacturing methods thereof have the advantages that the stainless steel material is the novel austenitic stainless steel; the smelting method is applicable to batch smelting of the high-nitrogen steel with the nitrogen content ranging from 0.4 wt% to 0.75 wt%; the blank punching method inhibits cold hardening phenomena in the high-nitrogen steel machining process, and blank punching is facilitated; through the machining method, the problem that machining difficulty is large due to high hardness of the high-nitrogen steel is solved.

A cerium iron alloy and preparation and usage methods thereof belong to the technology field of rare earth iron alloy. The component ranges of the alloy are: 0.1 to 15 wt% of cerium, and the rest is Fe and inevitable impurities, whose total amount is smaller than 1.0 wt%. The preparation technology adopts vacuum induction furnace for melting, takes cerium with purity larger than 99.0% and pure iron with purity larger than 99.0% as the raw materials, and then the raw materials are blended according to a formula that 0.1 to 15 wt% of cerium, and the rest is Fe. Then the mixture is melted in the vacuum induction furnace, the pressure of the vacuum room is controlled under 100 Pa, and the melting temperature is controlled in a range of 1550 to 1600. After the alloy is all melted, vacuum state is maintained for 4 to 6 minutes, then the vacuum is released. Finally ingot castings with qualified size are casted at the atmosphere of protection argon gas. The preparation method has the advantages that the alloy has a high density, and is not easy to be oxidized, pulverized, or damped; the yield of rare earth cerium is high during the steel-making process and the content of the rare earth cerium is stable.