34results about How to "The operation process is simple and controllable" patented technology

A preparation method for producing pigment by means of fermenting leccinum scabrum includes steps of preparing a liquid culture medium; fermenting the leccinum scabrum to obtain mycelium powder; ultrasonically extracting leccinum scabrum mycelium powder pigment in an auxiliary manner; and the like. In the method, liquid culture mycelium is fast in breeding speed, pigment yield is high, nutritional values are high, culture equipment is simple, sources of raw materials are wide, prices are cheap, large-scale production can be realized, ultrasonic extraction production period is short, an operation process is controlled easily, extraction efficiency is high, energy conservation and environmental protection are realized, an economic benefit is high, and industrial popularization is facilitated.

The invention discloses a silver-based multi-layer composite electrical contact material and a preparation method thereof. The silver-based multi-layer composite electrical contact material comprisesa working layer, an intermediate layer, a welding layer and a soldering layer, wherein the intermediate layer is arranged between the working layer and the welding layer, a pure silver or silver alloysoldering layer is arranged between the intermediate layer and the working layer, the material of the welding layer is cheap metal iron or iron-based alloy, the material of the intermediate layer ischeap metal copper or copper alloy, and the material of the working layer is one of AgMeO systems. The material is prepared by directional combination rolling, continuous diffusion annealing and coldrolling. Due to the presence of Cu and Fe, a large amount of silver can be saved, and the cost is substantially reduced; and the operation process has the advantages of good material consistency, highpracticability and the like and is simple and controllable, is suitable for mass production, the prepared silver-based multi-layer composite electrical contact material has the advantages of high conductivity, favorable bonding strength and weldability and can be widely applied to industry of a temperature controller, a contact is attractive in positioning, and the influence on thermal deformation of a welding piece is small.

The invention relates to a method for preparation of a silver antimony telluride thermoelectric material by combining low temperature solid phase reaction with hot pressing process. The method comprises the steps of: 1) ingredient compounding: according to the stoichiometric ratio of each element in the chemical formula AgSbTe2+x, weighing elemental silver, elemental tellurium and elemental antimony as raw materials, wherein x is 0-0.02; 2) briquetting sealing; 3) solid phase reaction: raising the temperature of the vacuum-tight block obtained in step 2) to a reaction temperature of 390-450DEG C, and conducting heat preservation for 6-12h to obtain a single phase silver antimony telluride ingot body or approximate single phase silver antimony telluride ingot body; 4) hot-pressing: grinding the obtained ingot and then performing hot pressed sintering, thus obtaining the high density silver antimony telluride thermoelectric material. The method has the characteristics of low reaction temperature, simple and controllable process, low preparation cost, and the prepared silver antimony telluride block material has the advantages of high density, high purity, good repeatability and excellent thermoelectric properties.

The invention discloses a high-strength viscose fiber and a production method thereof, which are characterized in that the viscose fiber is formed by mixing bacterial cellulose and viscose spinning solution, wherein the content of the bacterial cellulose in the viscose fiber is 1 to 10 percent. The production method comprises the following steps: the flake bacterial cellulose is pre-processed, and then the flake bacterial cellulose after the preprocessing is smashed with a ball milling method to obtain a micro nano-grade bacterial cellulose powder; the bacterial cellulose powder is added intothe viscose spinning solution to be uniformly scattered and defoamed to obtain a spinning solution; and the spinning solution is made into a high-strength viscose fiber. The content of the bacterial cellulose in the viscose fiber is 1 to 10 percent. The viscose fiber which is prepared with the production method has high strength, small shrinkage and good elasticity, can be blended and interwoven with cotton, wool and other synthesized fibers to be used for the fields such as top-grade costume fabric and industrial textiles, and the like.

The invention discloses a method for preparing proton current-conducting membrane fuel cell by adopting a spin coating method. The method is as follows: the mixing powder is dried for obtaining raw material powder; the raw material powder is directly spin-coated for preparing the proton current-conducting membrane by reaction in-situ; and the basic needed materials of the cell are obtained by sintering the mixing powder at high temperature. The electrolysis membrane is produced on a cell matrix by using the spin coating method, thus leading the electrolysis membrane to have compact structure and no cracking. The method shows that after being tested by the electrochemistry: and the maximum power density includes respectively 50mW / cm<2>, 155mW / cm<2> and 200mW / cm<2> at the temperature of 600DEG C, 700 DEG C, and 800 DEG C.

The invention discloses a novel method for preparing Sildenafil intermediate 4-amino-1-methyl-3-n-propyl-pyrazole-5-formamide. According to the method, the 4-amino-1-methyl-3-n-propyl-pyrazole-5-formamide is prepared from 1-methyl-3-n-propyl-pyrazole-5-ethyl formate through bromation and ammoniation. The novel method disclosed by the invention is safe, efficient and environment-friendly and is suitable for industrial production.