55results about How to "The synthesis process is stable" patented technology

A process for preparing the leimosiqiong hydrochoride from tetrahydrobenzoimidazole includes protecting by cycloacyl, arylcarbonylating, and acid hydrolyzing. Its advantages are high output rate (70%).

The invention provides a preparation method of tebipenem pivoxil, and relates to the technical field of pesticide synthesis. The preparation method of the tebipenem pivoxil comprises the following steps that 1-(4,5-dihydro-2-thiazolyl) azetidine-3-thiol hydrochloride and 1 beta-methyl vinyl phosphate are used as raw materials to take a reaction under the existence of diisopropylethylamine, and an acetonitrile water solution is used for washing to obtain an intermediate I; the intermediate I, an n-butyl alcohol water solution, a palladium-carbon catalyst and sodium bicarbonate take a mixed reaction, and treatment is performed to obtain an intermediate II; the intermediate II and chloromethyl pivalate take a reaction through phase transfer catalyst catalysis under the existence of diisopropylethylamine and dimethylformamide to obtain an intermediate III; the intermediate III and a sodium bicarbonate water solution are mixed, ethyl acetate is added, and reaction and refining are performed to prepare the tebipenem pivoxil. The preparation method has the advantages that the purity and the yield of the intermediates are obviously improved; the purity of the final product of the tebipenem pivoxil reaches 99.21 to 99.78 percent; the yield reaches 88.7 to 92.1 percent.

The invention relates to a FeMnNi powder accelerant with low cost, wherein the alloy comprises the components in percentage by weight as follows: 30-50% of Mn, 0-10% of Ni, 1-3% of Cr, 0.1-0.8% of C, 0.05-0.2% of Si and the balance of Fe. The oxygen content of a powder accelerant product optimized is less than or equal to 300ppm, and the nitrogen content is less than or equal to 180ppm. The accelerant is prepared by a gas atomization process of inertial gas, so that the accelerant powder is spherical or approximately spherical with uniform alloy composition. Diamond synthesized by the accelerant and graphite in proportion is greyish-green or dark green in color, and the crystal form of the diamond is a polygonal aggregate in a granular structure. The per mixed unit yield reaches over 154 carat / block by cavity with diameter of 40mm, the static pressure strength is average about 20N, and the coarsness proportion of 80 / 100 reaches over 60%, so that the accelerant is an ideal raw material for manufacturing an efficient diamond grinding apparatus for crisp and hard materials.

The invention discloses a synthetic method for organosilicone modified waterborne polyurethane resin. The synthetic method comprises the specific steps that firstly, polyester polyol Novomer is subjected to vacuum dehydration, diisocyanate is added dropwise, and a polyurethane prepolymer I is obtained after a reaction; secondly, polyhydroxy carboxylic acid is added to the polyurethane prepolymer I, a dihydric alcohol monomer is added dropwise, and a polyurethane prepolymer II is obtained after a reaction; thirdly, trimethylolpropane is added to the polyurethane prepolymer II, and a polyurethane prepolymer is obtained after a reaction; fourthly, organic amine is added to the polyurethane prepolymer for a salt forming reaction, a silane coupling agent, deionized water and diamine are sequentially added for chain extension and stirring, and the organosilicone modified waterborne polyurethane resin with high hardness is obtained after emulsification. The synthetic method has the advantages that the hardness of the organosilicone modified waterborne polyurethane resin reaches 3H, the adhesive force is good, and stability is good.

The invention relates to the field of fluorescent pigment, in particular to a synthesis technology of a water-emulsion fluorescent pigment, which mainly comprises an emulsification process, a seed emulsion polymerization process, a dropping reaction process and a post-treatment process; the invention comprises the following steps: firstly preparing emulsified liquid through the emulsification process, getting 5 to 20 percent of the total prepared emulsified liquid to synthesize the seed emulsion, then performing the dropping reaction process and the post-treatment process, so that the stability of the synthesis technology of the integrated water-emulsion fluorescent pigment can be ensured, thereby reducing the viscosity of the product and improving the transparency of resin and fluorescence of the product. Therefore, the water-emulsion fluorescent pigment prepared by the synthesis technology of invention has the advantages of low viscosity and high fluorescence.

A process for preparing the leimosiqiong hydrochoride from tetrahydrobenzoimidazole includes protecting by cycloacyl, arylcarbonylating, and acid hydrolyzing. Its advantages are high output rate (70%).