103results about How to "Short preparation route" patented technology

The invention discloses a fluorine-removing lanthanum-supported fiber adsorbent and a synthesis method thereof, belonging to the field of polymer materials. The fiber adsorbent comprises an active component and a matrix fiber, wherein the matrix fiber is an amidoxime fiber prepared through polyamine crosslinking reaction and amidoxime modification reaction of an acrylic fiber; and the active component is element lanthanum supported on the matrix fiber through in-situ reaction. The fiber adsorbent can be used for adsorbing and removing fluorine pollutants in water. Compared with the conventional fluorine-removing adsorbents, the novel fiber adsorbent disclosed by the invention has the characteristics that the adsorption speed is high, the adsorption capacity is as high as 34mg / g, the range of applicable pH value is as wide as 4-8 and the fiber adsorbent can be applied in various forms such as fiber bundles, non-woven fabrics and fabrics and can further meet the requirement of actual water treatment. The synthesis method has the advantages of available raw materials, simple process, mild reaction conditions and the like.

The invention relates to an azabicyclo medical intermediate, in particular to a synthesis method of 6,6-dimethyl-3-azabicyclo[3.1.0] hexane or a derivative thereof. A hetero-atom bicyclic compound is constructed through cyclization of an intra-molecular diazo group and an olefin bond, and a target product is finally obtained through an amination reaction and a reduction reaction.

The invention belongs to the technical field of carbon dioxide resource utilization and relevant chemistry, and relates to a method for preparing formate through carbon dioxide catalytic hydrogenation. The method is characterized by comprising the steps that carbon dioxide is used as a raw material and reacts with hydrogen under the catalysis of nano-porous palladium catalyst and the alkaline condition to obtain formate. By means of the method for preparing the formate through carbon dioxide catalytic hydrogenation, the preparation route is short, raw materials are cheap and easy to obtain, conditions are mild, operation is simple and convenient, and the reaction yield is high.

The invention relates to a novel preparation method of carboxymethyl guar gum, which comprises the following three steps: alkalization reaction, etherification reaction and after-treatment. The carboxymethyl guar gum is prepared from the raw material guar gum raw powder by using ethanol as a reaction solvent and sodium hydroxide as a catalyst; and the viscosity of the prepared carboxymethyl guar gum is 3600 mPa.s, and the substitution degree is 0.68. The carboxymethylation reaction of the guar gum is performed in the ethanol solution, so that the carboxymethyl guar gum prepared by the reaction between the chloroacetic acid and guar gum has the advantages of high substitution degree, high viscosity, high solubility and low content of water-insoluble substances. The raw material and process route related in the reaction process conform to the green chemical requirements, and can not generate pollutants, and thus, the reaction process is economic and environment-friendly and has high adaptability. The method has the advantages of short preparation route and simple technique, and is convenient to operate and suitable for large-scale industrial production.

The invention discloses a full-spectrum selective reflection and photoluminescence Janus oligomer and a preparation method thereof, wherein the full-spectrum selective reflection and photoluminescenceJanus oligomer is constructed by graft copolymerization of a chiral liquid crystal monomer, a nematic liquid crystal monomer, fluorescent molecules and polymethyl hydrogen-containing siloxane, and the structure is shown as a formula I in the specification. According to the invention, the Janus oligomer can realize full-spectrum selective reflection in heating and cooling processes, and has high reversibility and accuracy; under the excitation of ultraviolet light, the Janus oligomer can emit fluorescence, wherein when the temperature rises to the thermal decomposition temperature of the Janusoligomer from the room temperature, the fluorescence intensity is monotonically reduced, and the fluorescence intensity still has high reversibility along with the change of the temperature; and theJanus oligomer prepared by the method has dual characteristics of dynamic reversible full-spectrum selective reflection and photoluminescence, has a wide application prospect in the anti-counterfeiting field, and is short in preparation route, safe and simple to operate and mild in reaction condition.

The invention provides a cationic curing epoxy organic silicon resin of which the structural formula is disclosed in the specification. The invention also provides a preparation method of the resin, which comprises the following steps: adding 1,3,5,7-tetramethylcyclotetrasiloxane and allyl glycidyl ether into a reaction vessel, and adding a solvent, a catalyst and a polymerization inhibitor; heating to react, distilling the reaction mixture under reduced pressure to obtain epoxy-group-containing cyclotetrasiloxane, adding the epoxy-group-containing cyclotetrasiloxane, methylphenylcyclosiloxane and a blocking agent into another reaction vessel, heating to react in a nitrogen protective atmosphere, and distilling under reduced pressure, thereby obtaining the cationic curing epoxy organic silicon resin. The curing product of the cationic curing epoxy organic silicon resin has the characteristics of high crosslinking degree, high hardness and the like.

The invention discloses a single-package organic silicon rubber packaging adhesive for a high-power type white LED (light-emitting diode) and a preparation method of the single-package organic silicon rubber packaging adhesive. The preparation method of the single-package organic silicon rubber packaging adhesive for the high-power type white LED comprises the following steps: uniformly stirring 100-120 parts by weight of high-viscosity self-crosslinked phenyl organic silicon rubber, 0.001-0.005 part by weight of a catalyst, 0.002-0.005 part by weight of an inhibitor and 4-8 parts by weight of a reinforcing agent; and, then, deaerating the components in vacuum for 15-30 minutes to obtain the single-package organic silicon rubber packaging adhesive, with a high refractive index and high light transmittance, for the high-power type white LED, wherein the single-package organic silicon rubber packaging adhesive is transparent after being cured, and has shore A hardness of 53-77. The preparation method is simple, environment-friendly and efficient. The single-package organic silicon rubber packaging adhesive is used for high polymer material fields such as high-power LED packaging, is used for filling and sealing of electrical elements, filling and sealing of high-pressure parts and moisture-proof coating of circuit boards, packaging, insulation protection and the like of electronic LED indoor and outdoor display panels, LED traffic signals, and the like.

The invention discloses a preparation method of hexafluoroisobutene, comprising the steps of (1) reacting heptafluoroisobutene methyl ether, methanol and a halide in type I solvent, cooling after reacting, filtering, rectifying the filtrate to obtain methyl hexafluoroisobutyrate; (2) allowing the methyl hexafluoroisobutyrate of step (1) to react with a reducing agent in type II solvent, quenching with hydrochloric acid after reacting, filtering, rectifying the filtrate to obtain hexafluoroisobutanol; (3) allowing the hexafluoroisobutanol of step (2) to react with an alkali in a molar ratio of 1:(1-10) in type III solvent, collecting the reaction product, and rectifying to obtain finished hexafluoroisobutene. The preparation method has the advantages that the process is simple, the yield is high, the raw materials are low in price and easy to obtain and the preparation method is suitable for industrialization.

The invention discloses a chiral fluorescent liquid crystal with three primary colors at room temperature and with dual anti-counterfeiting mechanisms and a preparation method thereof. The chiral fluorescent liquid crystal is constructed by grafting and copolymerizing a chiral liquid crystal monomer, a nematic fluorine-containing liquid crystal monomer, a fluorescent monomer and polymethylhydrosiloxane. The structure of the chiral fluorescent liquid crystal is shown as a formula I which is described in the specification. According to the invention, at a room temperature (0-25 DEG C) and under visible light of a bright field, a color reflected by the chiral fluorescent liquid crystal is gradually changed from red to green along with the change of an angle between a sight line and a planar film of the chiral fluorescent liquid crystal from 90-30 degrees due to Bragg selective reflection of the chiral fluorescent liquid crystal; and in a dark field and under the irradiation of ultraviolet light with a length of 310 nm, the chiral fluorescent liquid crystal can emit blue characteristic fluorescence. The chiral fluorescent liquid crystal prepared by the invention can realize three primary colors, namely red, green and blue in a room temperature range (0-25 DEG C), and has wide application prospects in an anti-counterfeiting field.

The invention discloses a silicone sealant for a daylighting board and a preparation method thereof. The preparation method comprises the following steps: adding the silicone rubber 107, the reactive reinforcing agent and the active filler into a vacuum kneading machine in sequence according to the fact that the weight ratio of silicone rubber 107 to a reactive reinforcing agent to an active filler is (100-120): (3-10): (3-10), kneading for 10-30 minutes at a room temperature, then stirring and heating to 150 DEG C, carrying out heat preservation and dehydrating for 2-4 hours, cooling to a room temperature and then discharging to obtain a base material; adding the base material into a planetary stirrer, stirring and vacuumizing for 1 hour, then adding a cross-linking agent, a tackifier, a plasticizer, a flame retardant and a catalyst in sequence according to the fact that the weight ratio of the base material to the cross-linking agent to the tackifier to the plasticizer to the flame retardant to the catalyst is 100: (3-15): (1-10): (5-25): (30-50): (0.1-1), uniformly stirring under vacuum and discharging to obtain the silicone sealant with high elongation rate, low modulus and high light transmittance for the daylighting board.

The invention provides preparation methods of a himbacine analogue and intermediates thereof. The invention specifically provides novel preparation methods of a compound A, a compound 4, a compound D and a compound C. According to the invention, a scheme for preparing the compound A does not require a process for reducing carboxylic acid into aldehyde, but directly oxidizing corresponding alcohol into corresponding aldehyde. The operation is safe. In prior arts, carboxylic acid is first converted into acyl chloride, and acyl chloride is catalytically hydrogenated into aldehyde with a palladium catalyst. In the above process, anhydrous palladium-carbon is needed. With the methods provided by the invention, the above harsh condition is avoided. The preparation methods are simple, and operation steps are easy. Especially, when a hydroxyl group protection group P is benzyl group, nitro group can be reduced into amino group when the protection group P is removed. Therefore, the reaction steps are greatly simplified, and raw materials and agents are saved. The entire route has the advantages of low production cost and high yield, and is suitable for industrialized production.

The invention discloses a functional emulsion which is characterized by comprising the following raw materials: a fluorine-containing acrylate monomer, an acrylate monomer, a crosslinking monomer 1, acrosslinking monomer 2, an emulsifier, an initiator and deionized water. The preparation method comprises the following steps: adding deionized water and the emulsifier into a reaction container, dropwise adding a mixture of the fluorine-containing acrylate monomer, the acrylate monomer, the crosslinking monomer 1 and the crosslinking monomer 2 into the reaction container, heating to 60-75 DEG C,adding the initiator into the reaction container, reacting for 3-5 hours while stirring, heating to 85-90 DEG C, and reacting for 1-2 hours while stirring, thereby obtaining the functional emulsion.The functional emulsion is good in film-forming property and high in contact angle with water, and can be widely applied to protection of airplanes, ships, buildings, traffic and various machines.

The invention provides waterborne resin emulsion and a method for preparing the same. The waterborne resin emulsion is characterized by comprising, by weight, 20-60 parts of functional acrylate monomers, 100-150 parts of acrylate monomers, 1-10 parts of cross-linking monomers, 4-20 parts of emulsifiers, 0.3-1 part of initiators and 250-350 parts of deionized water. Raw materials for the functionalacrylate monomers include hydroxyethyl acrylate, isophorone diisocyanate, antioxidants CA, solvents and a catalyst, a weight ratio of the hydroxyethyl acrylate to the isophorone diisocyanate to the antioxidants CA to the solvents to the catalyst is 50-60:110-150:160-200:100-200:0.01-1, the solvents are mixtures of more than one or two types of acetone and ethyl acetate, and the catalyst is dibulytin dilaurate. The waterborne resin emulsion and the method have the advantages that the waterborne resin emulsion is good in film-forming property and wide in damping temperature range, and can be widely used for vibration attenuation and noise reduction for aircrafts, ships, buildings, transportation and diversified machinery, and good high and low-temperature damping effects can be realized.

The invention provides a method for preparingmycophenolate sodium from mycophenolic acid strains, comprising the following steps: selecting the mycophenolic acid strains to produce strain spore suspension liquid, inoculating the strain spore suspension liquid in a seed medium and cultivating for 2-4 days at a temperature of 26-28 DEG C; inoculating the seed medium in a fermentation tank, adding a fermentation medium, and fermenting for 9-11 days at a temperature of 26-28 DEG C; adding acid into fermentation liquid in such a manner that pH value of the fermentation liquid is 3-4, adding a sodium hydroxide solution into the fermentation liquid in such a manner that pH value of the fermentation liquid is 8-9, decolorizing and recrystallizing to obtain mycophenolic acid; and synthesizing the mycophenolic acid and sodium hydroxide or sodium methylate in alcohols solvent to obtain the mycophenolate sodium. According to the method provided by the invention, the fermentation liquid obtained by cultivating the mycophenolic acid strains is subjected to acid and alkali treatment, and the sodium hydroxide or the sodium methylate is adopted to synthesize the mycophenolate sodium; and therefore the method has the advantages of short preparation route, simple operating procedure and lower production cost; meanwhile, the application of ketones organic solvent is avoided, and harm to the environment and human body is reduced.

The invention discloses modified polyimide foam and a preparation method thereof. The preparation method comprises the following steps: aromatic dianhydride and / or aromatic acid ester, siloxane with active terminal group, low molecular alcohol, a catalyst and a surface active agent are mixed into a polar solvent according to proportion and react to form foaming precursor solution which reacts with isocyanate to form foaming intermediate solution; and the foaming intermediate solution carries out foaming freely in a mold and forms a modified foaming intermediate which is radiated by microwave or / and heated and cured in an oven, and then the solid polyimide foam is obtained. The method has short route of preparation process and simple technique; the foaming precursor solution has good stability of storage, is suitable for the processing techniques of casting, painting, extruding and the like, and the defects of broken foam, parallel foam, depression and incomplete imidizate of materialsdo not occur; the polyimide foam has even aperture, high stability, low rigidity, good flexibility and good processability; and the preparation cost is low, thus being convenient to promotion and application.