14 results about "Cyanate" patented technology

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.

The application relates to the technical field of organic synthesis, and discloses a synthesis method of benzthiazuron, which comprises the following steps: step 1, addition reaction of alpha-methyl styrene and hydrogen chloride gas, and degassing to obtain a first reaction liquid; step 2, substitution reaction of the first reaction liquid and cyanate in the presence of a zinc chloride catalyst, and filtration to obtain a second reaction liquid containing isocyanate; and step 3, construction of an inorganic salt aqueous solution system with a density of 1.05-1.10 g / ml and a pH of 9-10, dropwise addition of the second reaction liquid into the system for condensation reaction with o-chlorobenzylamine, and post-treatment and refinement to obtain a target product. The non-phosgene route of chloro-isocyanate substitution is adopted, and the use of the toxic phosgene is completely avoided; the salting-out effect and interface control generated by the specific high-density salt solution effectively inhibit the isocyanate hydrolysis side reaction, and the reaction yield and product purity are obviously improved.

The application discloses a kind of nanocarrier of cosmetic active substance, micro-nano flow control preparation method and application, it is related to nanocarrier technology and cosmetic field.The application includes the following steps: S1, preparation of lipid phase, phospholipid and sterol are uniformly dissolved in ethanol, obtain lipid phase;S2, preparation of water phase, cyanate fruit polysaccharide and polypeptide are uniformly dissolved in distilled water, after uniform dissolution, centrifugation, take supernatant, obtain water phase;S3, preparation of nanocarrier, lipid phase and water phase are transported to the inside of micro-nano flow control chip and combined, lipid phase and water phase are combined to form nanocarrier in the inside of micro-nano flow control chip, obtain precursor solution containing nanocarrier;S4, screening nanocarrier, precursor solution is reduced pressure distillation, then centrifugal removal organic solvent and free un-wrapped component, obtain nanocarrier.Polypeptide is dissolved in water phase, can keep the active conformation of polypeptide peptide chain in larger amount, so that nanocarrier can deliver active substance to the specified structure layer of skin.

Compositions and methods are disclosed for improving seed quality. For example, treating a stand of seed crops with a seed crop treatment that includes an effective amount of cyanate, thiocyanate, an acceptable salt of cyanate or thiocyanate, an ester of cyanate or thiocyanate, an isocyanate or isothiocyanate, or a combination thereof results in one or more improved seed qualities compared to a control. The improved seed qualities may include, but are not limited to, enhanced seed vigor, increased quantity of saleable seed, increased proportion of saleable seed, increased uniformity of seed shape and size, and desirable bag weight.

This invention provides a method for purifying erythromycin thiocyanate. The method first involves dissolving crude erythromycin thiocyanate in an ester solvent under alkaline conditions; then adding thiocyanate and crystallizing under neutral to slightly alkaline conditions; followed by membrane-assisted cooling for secondary crystallization; and finally, filtration and drying to obtain purified erythromycin thiocyanate. This invention uses a membrane-assisted cooling coupled crystallization method instead of the traditional cooling crystallization method, successfully controlling the nucleation rate, eliminating explosive nucleation, and significantly improving the content and yield of erythromycin thiocyanate A.

The application discloses an anti-interference airport FOD radar antenna cover composite material and a preparation method thereof. The application adopts an epoxy functional group functionalized silica aerogel precursor solution, and introduces a nanometer aluminum foil with surface grafted epoxy groups to construct a layered structure. The silica aerogel not only forms a stable interpenetrating network structure with a cyanate-epoxy resin matrix through chemical bonding, but also forms a directional reinforcing skeleton inside the aerogel due to the two-dimensional sheet characteristics of the nanometer aluminum foil. The shrinkage stress generated during the curing process of the composite material can be effectively dispersed and absorbed, the interface defects such as micro-cracks and pores generated due to the shrinkage of the resin during curing are greatly reduced, the water absorption and environmental sensitivity of the composite material are reduced, the dielectric properties of the composite material are stabilized, the bending strength and impact toughness of the composite material are simultaneously improved, and the composite material can better resist the impact of hail, tool falling and other foreign matters in the operation of the airport.

A method of treating mining effluents containing at least one of nitrogen or cyanide species, the method comprising injecting ozone in the mining effluent in successive treatments performed at different pH. Also, a method of treating mining effluents with bromide and ozone. Also, a method of treating mining effluents containing cyanates with ozone at a relatively low pH.

Cyanate esters are used as monomers in a polymerizable composition for preparing solid articles. In particular:a) multifunctional cyanate esters with formula R(OCN)n are used as the monomers, R is an n-valent carbohydrate residue having up to 50 carbon atoms and n is an integer ≥2;b) an organometallic photoinitiator activatable by electromagnetic radiation and / or thermal energy is used as the polymerization initiator;c) a compound containing at least on acidic hydrogen atom is used as a co-catalyst; andd) the polymerization is conducted in a 3D printing method which involves heating and irradiating the photopolymerizable composition.All components of the composition are initially heated to a temperature of >70° C. to obtain a homogeneous liquid mixture, which is irradiated at least at the same temperature with a wavelength suitable to activate the organometallic polymerization initiator and obtain a three-dimensional solid body.

This invention discloses a method for preparing a flexurally resistant coating using terbium-carbon nanotube co-doped cyanate, comprising the following steps: (1) dissolving terbium salt in anhydrous ethanol, and then adding an organic compatibilizer to prepare a modified terbium solution; (2) adding electrochemically de-zipped carbon nanotubes (uCNTs) to the modified terbium solution for ultrasonic dispersion, and drying to obtain Tb 3+ -uCNTs nanofillers; (3) Tb nanofillers 3+ -uCNTs are added to the cyanate ester resin matrix and mechanically stirred until homogeneous to obtain Tb. 3+ A terbium-modified cyanate ester resin-based coating is uniformly coated onto tinplate and cured at temperature gradients of 100℃ / 130℃ / 150℃ / 180℃ / 210℃. This invention involves the reaction of terbium salts with unzipped carbon nanotubes under the action of a compatibilizer. This effectively transfers some surface energy, preventing the unzipped carbon nanotubes from agglomerating into bundles, strengthening the interfacial bonding between the carbon nanotubes and the substrate, and thus improving the flexural resistance of the composite coating.

This invention belongs to the field of polymer materials and relates to a medium-temperature curing low-dielectric cyanate ester resin system and its preparation method. This method balances good processability and functionality, ensuring good dielectric properties and certain temperature resistance of the cured resin while providing medium-temperature curing conditions. The cyanate ester resin formulation of this invention comprises 95-99 parts by weight of cyanate ester resin matrix, 1-5 parts by weight of curing agent, 0.01-0.1 parts by weight of catalyst, and 5-10 parts by weight of modifying component. Preferably, the modifying component is one or more of methyl silicone resin, phenyl silicone resin, methylphenyl silicone resin, and MQ silicone resin. The medium-temperature curing low-dielectric cyanate ester resin preparation method of this invention is simple to operate, has a long process window, controllable curing process, short curing time, low residual stress in the cured product, and is solvent-free, making it easy to scale up for production and suitable for various processes such as liquid molding and prepreg.

The application belongs to the technical field of medical chemistry synthesis, and particularly relates to a method for preparing dicyandiamide by preventing fouling of urea pyrolysis, which comprises a process of reacting raw materials of urea, alkaline earth metal oxide and scale inhibition dopant, wherein the scale inhibition dopant comprises at least one of silicon dioxide and titanium dioxide, and the weight of the scale inhibition dopant accounts for 0.1% to 5% of the weight of the alkaline earth metal oxide. Experiments show that the introduction of the scale inhibition dopant in the reaction system can change the surface tension of the isocyanate melt, help to improve the surface properties and rheological state of the intermediate melt, reduce the adhesion and aggregation of the material on the reactor wall surface, reduce the risk of fouling and plugging, even eliminate the fouling of the reactor wall surface, and improve the stability of continuous production.

Embodiments of this disclosure relate to a method for selectively depositing a metal after using a fluid polymer to protect a substrate surface within a feature. A first metal layer is deposited by physical vapor deposition (PVD). The semiconductor substrate surface is exposed to one or more monomers to form a fluid and flexible polymer film on the first metal layer within at least one feature. The fluid polymer film is formed on the first metal layer at the bottom. One or more monomers are selected from one or more difunctional amines, difunctional aldehydes, difunctional cyanates, difunctional ketones, and difunctional alcohols. At least a portion of the first metal layer is selectively removed from the top surface and at least one sidewall. The fluid polymer film is removed.

This invention discloses a highly selective ion network adsorption material for cesium removal, its preparation, and its application. The adsorption material comprises a ferrocyanate ionic liquid and a polymer matrix. The polymer matrix is ​​selected from any one or more of covalent organic frameworks, polyimides, and alginate polymers. The molecular formula of the ferrocyanate ionic liquid is [N...]. n111 ] x M[Fe(CN)6] has a cation structure consisting of a quaternary ammonium cation with a long alkyl chain and a transition metal ion, and an anion consisting of a ferrocyanate anion. This invention solves the problems of low selectivity, small adsorption capacity, poor chemical stability, and environmental risks associated with existing technologies in high-salt environments. This ion network adsorbent material exhibits advantages such as high stability, excellent adsorption selectivity, and high adsorption capacity, demonstrating extremely high cesium adsorption selectivity and considerable adsorption capacity in high-salinity nuclear wastewater solutions.

This invention relates to the field of semiconductor packaging materials technology, specifically disclosing a low-dielectric filler for packaging chips and its preparation method. The invention uses fluorosilicone-modified benzoxazine, fluorosilicone-modified alicyclic epoxy resin and dicyclopentadiene cyanate prepolymer crosslinking to form a low-viscosity polymer, and then adds low-dielectric filler F-mesoporous SiO2 and functional additives. The resulting low-dielectric filler has low viscosity, can fill ultrafine gaps well, and after curing, the filler has low volume shrinkage and good high-frequency dielectric properties.