135 results about "Isothiocyanate" patented technology

The invention belongs to the field of temperature control, and particularly relates to a reaction kettle temperature control method and system for synthesizing isothiocyanate. The method comprises the following steps: acquiring temperature, material concentration and coolant flow in a kettle in real time, calculating a reaction rate estimated value through a nonlinear mixed model, and calculating an active factor by combining catalyst input time and an index inactivation function; performing unequal weight combination on the three parameters to generate a scheduling variable, and calculating a current value and a second-order difference value of the scheduling variable; selecting a reference state space model according to the current value of the scheduling variable, and correcting the matrix by using a second-order difference value to obtain an LPV model; constructing a quadratic programming optimization problem, wherein an objective function comprises a temperature tracking error penalty term and a control input increment penalty term for adjusting the weight; when the temperature deviation exceeds the threshold value continuously, a control input value penalty term is added; and solving an optimization problem and outputting a first element of the control sequence to a temperature control execution mechanism. According to the invention, the temperature control precision and stability of the isothiocyanate synthesis reaction kettle are improved.

The invention relates to the technical field of preparation of polyurethane plastic materials, in particular to an environment-friendly high-elasticity foaming material as well as a preparation method and application thereof. The preparation method of the foaming material comprises the following steps: perfluorooctyl sulfonyl fluoride and diaminopropyl polydimethylsiloxane are subjected to a reaction, and fluorine-containing polydimethylsiloxane is obtained; the preparation method comprises the following steps: reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propanohydrazide with terephthalic diisothiocyanate to obtain isothiocyanate modified hindered phenol; the isothiocyanate modified hindered phenol reacts with primary amine at the terminal position of a fluorine-containing polydimethylsiloxane molecule through an isothiocyanate group to obtain an intermediate, and the intermediate is subjected to a desulfurization reaction to obtain a modifier; the preparation method comprises the following steps: reacting diisocyanate with polyether polyol, polyester polyol and natural polyol to obtain a component A, and stirring and mixing polyether polyol, a bio-based chain extender, a modifier, a catalyst and a foaming agent to obtain a component B; stirring and mixing the component A and the component B, and foaming to obtain the environment-friendly high-elasticity foaming material.

The invention relates to the technical field of polypropylene nucleating agents, and particularly discloses a polypropylene beta nucleating agent based on polythiourea and a preparation method and application thereof.The preparation method comprises the steps that under the nitrogen protection atmosphere, 1, 4-phenyl diisothiocyanate and an amino-terminated compound are added into a solvent, and a constant-temperature stirring reaction is conducted; after the reaction is completed, a reaction product is subjected to precipitation, filtration, impurity removal and drying, and a precipitate is obtained; and dissolving the precipitate in a solvent, forming a film, and then grinding or cutting into pieces to obtain the polypropylene beta nucleating agent. The polypropylene beta nucleating agent based on polythiourea prepared by the invention is a novel polypropylene beta nucleating agent containing a thiourea group, has unique hydrogen bond network and pi-pi accumulation effect, and can induce polypropylene to form a beta crystal form in a wide temperature range after polypropylene is melt-blended; the mechanical property and the electric breakdown resistance of the polypropylene material are improved. The preparation method is simple, low in production cost and suitable for large-scale industrial application.

The invention provides a preparation method of a novel chiral thiourea / phosphine bifunctional organic catalyst with a cis-cyclic 1, 2-phosphinamine skeleton and application of the novel chiral thiourea / phosphine bifunctional organic catalyst in an asymmetric catalytic reaction. The chiral organic catalyst is prepared by taking cis chiral 2-(diphenylphosphine)-1, 2, 3, 4-tetrahydro-1-naphthylamine and an isothiocyanate compound as raw materials through a one-step reaction under a mild condition. The chiral thiourea / phosphine bifunctional organic catalyst is simple to prepare and stable in property, and shows excellent catalytic activity and stereoselectivity in an asymmetric hydrosilylation reaction of o-amido benzophenone.

The present application belongs to the technical field of protein composition, and relates to a collagen composition and a preparation method thereof. The present application provides a preparation method of a collagen composition, which comprises the following steps: preparing a collagen solution by treating raw hide which has not been subjected to chemical cross-linking treatment; adding a cross-linking promoter, an isothiocyanate and alpha-mammeigin to the collagen solution; and finally obtaining the collagen composition by multiple short-time microwave treatment. The collagen composition provided by the present application avoids the use of a cross-linking agent, has the advantages of no cytotoxicity, high cross-linking degree and good stability, and exhibits excellent antibacterial and antioxidant functions.

The application discloses a tryptamine detection method based on triple emission MOFs and a smart phone. A rare earth metal organic framework (AP-Eu) is used as a luminescent matrix, and a fluorescent guest molecule fluorescein-5-isothiocyanate (FITC) is post-modified to obtain a ratio fluorescent material with triple emission characteristics. Competitive absorption of ligands and tryptamine, pH response of FITC and hydrogen bonding are used to realize fluorescence signal regulation, and then high-sensitivity and high-selectivity fluorescence recognition of tryptamine is realized. The method is further applied to quantitative detection of tryptamine in beer samples, visualization detection of foam and on-site rapid detection assisted by a mobile phone APP. The application provides a safe and efficient tryptamine detection and fluorescence sensing method, and significantly improves detection accuracy and on-site applicability.

The invention belongs to the technical field of biosensing detection, and particularly discloses a label-free ratio fluorescence sensor and application thereof in quinine detection. The label-free ratio fluorescent aptamer sensor takes isothiocyanate as an internal reference signal and a fluorescent dye as a detection signal, and is obtained by mixing and incubating a quinine specific nucleic acid aptamer, a triphenylmethane fluorescent dye and isothiocyanate in a buffer solution. According to the invention, isothiocyanate is introduced as an internal reference signal, triphenylmethane dye is selected as a target response fluorescence signal molecule, and the quinine is detected by using the obvious fluorescence change of the target response fluorescence signal molecule in the binding-dissociation process of the target response fluorescence signal molecule and a quinine specific nucleic acid aptamer. The label-free ratio fluorescence sensor has excellent selectivity and stability, can be widely applied to the fields of food safety supervision, drug quality control, environmental water quality detection and the like, and is particularly suitable for rapid detection and emergency monitoring of quinine under the condition of limited resources.

A novel bis-ligand chalcopyrite collector and a preparation method and application thereof. The collector is prepared by first synthesizing an intermediate oxalyl diisothiocyanate from oxalyl chloride and thiocyanate, and then reacting the intermediate with an amine or an alcohol using a one-pot method. The collector provided by the present disclosure can form more stable dual-site adsorption on the chalcopyrite surface, thereby generating a more stable double-chelate-ring structure than the single-site adsorption of a traditional chalcopyrite collector such as xanthate and dithiophosphate. The collector not only has higher collection ability and excellent selectivity, but also can achieve efficient copper-sulfur separation even under a low-alkalinity condition. The preparation process of the collector is simple and operable, facilitating the flotation of chalcopyrite and its separation from pyrite.

This invention belongs to the field of rubber antioxidant technology, and specifically relates to an anti-caking composite rubber antioxidant 6PPD and its preparation method. The anti-caking composite rubber antioxidant 6PPD is prepared by reacting 3-aminoadipic acid with 4-pentenyl isothiocyanate, grafting it onto silica using a silane coupling agent, and complexing it with lanthanum ions to obtain a functional antioxidant. This functional antioxidant is then compounded with a base antioxidant N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, microcrystalline wax, and an antioxidant to prepare the anti-caking composite rubber antioxidant 6PPD. The prepared anti-caking composite rubber antioxidant 6PPD possesses multiple protective mechanisms—chemical protection, physical barrier, and multi-mechanism synergy—exhibiting excellent aging resistance, good processability, and easy storage due to its anti-caking properties.

An agent containing at least one aroma compound selected from the group consisting of E-beta-damascone, S-(2-methyl-3-furyl)ethanethioate, beta-caryophyllene oxide, beta-ionone, 2,5-dihydroxy-1,4-dithiane, methyl anthranilate, S-furfuryl thioformate, 1-isothiocyanate-3-(methylthio)propane, nootkatone, 1,4-dioxacycloheptadecane-5,17-dione, sclareol, and sclareolide is effective for masking an unpleasant smell and for making oral products in which an unpleasant smell is masked.

The application discloses a method for preparing S-alkyl isothiourea under visible light irradiation, and a structural formula of the S-alkyl isothiourea is shown in formula 1. The preparation method comprises the following steps: adding secondary amine, aryl isothiocyanate, aryl alpha-diazo ester and cyclic ether as reaction raw materials into a reactor, adding an organic solvent, and stirring and reacting at room temperature under visible light irradiation for 3 hours. After the reaction is completed, the reactants are concentrated under reduced pressure, and the target product S-alkyl isothiourea is obtained through column chromatography separation. According to the application, secondary amine, aryl isothiocyanate, aryl alpha-diazo ester and cyclic ether are reacted under the promotion of visible light, and a series of S-alkyl isothiourea is efficiently synthesized in one-step operation. The process of the application is completed at room temperature under the condition that no heating and any metal catalyst, base, ligand and other additives are needed, and clean visible light energy is used as a reaction energy source. The process of the application has the advantages of simple operation, mild reaction condition, high efficiency, low energy consumption, high safety and small pollution.

The rapid horseradish dewatering and pulverizing device comprises a dewatering mechanism used for conducting multi-stage moisture removal on horseradish and a smashing mechanism used for smashing the dewatered horseradish, the smashing mechanism is arranged in a pulverizing box, the dewatering mechanism comprises an outer cylinder arranged in an inclined mode, an inner cylinder is coaxially arranged in the outer cylinder, and the inner cylinder is arranged in the pulverizing box. A cavity is formed between the inner cylinder and the outer cylinder, a pre-dehydration structure used for removing free moisture on the surface of horseradish is arranged on one side of the outer cylinder, a microwave dehydration structure used for further removing the moisture of the horseradish is further arranged in the cavity, and a material overturning structure used for overturning the horseradish is further arranged in the inner cylinder; a feeding hopper is arranged on one side of the outer cylinder, a discharging opening is formed in the other side of the outer cylinder, and the discharging opening conveys dehydrated horseradish to a smashing mechanism in the powder making box through a main conveying channel. According to the scheme, the dehydration period is shortened, meanwhile, damage to cell structures by high temperature is avoided, volatilization of isothiocyanate is reduced, the horseradish fiber characteristics can be adapted, and the powder making efficiency is improved.

It is an object of the present invention to provide a compound that can provide a liquid crystal composition with a high Tni, a high Δn, a low Vth, a high Δεr, a low tan δiso, and high storage stability at low temperatures, a liquid crystal composition, as well as a liquid crystal display element, a sensor, a liquid crystal lens, optical communication equipment, and an antenna each using this. Specifically disclosed are a compound represented by the general formula (i) having an ethynylene group (—C≡C—) and an isothiocyanate group (—NCS) and a liquid crystal composition containing one or two or more of the compounds.

The invention relates to the technical field of luminescent coatings, in particular to modified isocyanate resin containing aggregation-induced emission groups as well as a preparation method and application of the modified isocyanate resin. According to the preparation method, tromethamine is adopted to introduce tetraphenyl ethylene-isothiocyanate containing an aggregation-induced emission group into 4, 4 '-dicyclohexylmethane diisocyanate, so that the modified isocyanate resin is obtained. Luminescent paint can be obtained by using the modified isocyanate resin as a curing agent. The fluorocarbon coating prepared by taking the modified isocyanate resin as a curing agent and matching the modified isocyanate resin with fluorocarbon resin has the advantages of luminescence property, excellent weather resistance and excellent stain resistance.

The present invention relates to heteroaromatic isothiocyanates of formula (N) as defined in claim 1, to liquid crystalline media comprising one or more compounds of formula (N), and to high-frequency components comprising these media, in particular to microwave components for high-frequency devices, such as devices for changing the phase of microwaves, tunable filters, tunable metamaterial structures and electron beam steering antennas, such as phased array antennas.

A composition includes a functionalized fluorescent dye. The functionalized fluorescent dye includes an isothiocyanate-containing dye functionalized with a functional group. The functional group includes an aromatic compound with a primary amine. The functionalized fluorescent dye can be mixed with a fluid to form a tracer fluid for tracing fluid flow in a subterranean formation.

An object of an aspect of the present invention is to provide a liquid crystal composition having excellent Tni, Δ n, γ 1, Δ ε r, tan δ iso, preservability, and / or the like, and a liquid crystal display element, a sensor, a liquid crystal lens, an optical communication device, and an antenna in which the liquid crystal composition is used.SOLUTION: Specifically, the liquid crystal composition contains one or more compounds represented by the general formula (i) having an alkenyl group and an isothiocyanate group (- NCS) and one or more compounds represented by the general formula (ii) having a directly bonded three - or four ring structure and an isothiocyanate group (- NCS).SELECTED DRAWING: None

A compound of formula UIand a liquid crystal medium containing the compound of formula UI and high-frequency components containing such media, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures, and electronic beam steering antennas, for example, phased array antennas.

The invention relates to the field of nonlinear optical materials, and discloses a mixed bonded isothiocyanate nonlinear optical crystal and a preparation method thereof.The preparation method comprises the following steps that a zinc source is dissolved in deionized water to obtain a zinc source solution, and a sulfur source is dissolved in deionized water to obtain a sulfur source solution; mixing the solutions, heating and stirring to form a [SZn4] covalent core precursor suspension; sequentially adding 1, 2, 4-triazole, thiocyanate and triethanolamine into the suspension liquid, and uniformly stirring; and placing the obtained mixture in a reaction kettle for temperature programming reaction and constant-temperature reaction, then performing temperature programming cooling to room temperature, and filtering, washing and drying to obtain the crystal. By constructing a stable [SZn4] covalent core and regulating and controlling directional arrangement of NCS-and C2H2N3 ligands, effective superposition of microscopic nonlinear polarizability is realized, so that the material obtains higher second harmonic response, the thermal stability of the crystal is improved, and the optical band gap is widened.

The invention provides a lithium ion secondary battery. The electrolyte in the lithium ion secondary battery comprises an isothiocyanate additive; the oxidation potential of the isothiocyanate additive is 3.7 to 4.1 V, the fluorine ion affinity is-11 to-7 kcal / mol, and the LUMO (lowest unoccupied molecular orbital) energy level is-2.2 to-1.1 eV; the positive electrode active material of the positive plate comprises LiaNixCoyMzAdO2, wherein 0.85 < = a < = 1, 0.8 < = x < = 1, 0.05 < = y < = 0.15, 0 < z < = 0.05, and 0 < = d < = 0.05; m comprises Mn and / or Al, and A comprises at least one of Mg, Ca, Sr, Ba, Al, Sc, Ga, In, Ti, Zr, Sn, Hf, Ta, Nb, W, Mo, V, Cr, Y, La, Ce, Pr and Nd. The lithium ion secondary battery has excellent cycle performance and relatively low interface resistance at a high temperature.

The invention discloses a Cu < 2 + > ion fluorescence chemical sensor as well as a synthesis method and application thereof. The Cu < 2 + > ion fluorescence chemical sensor comprises a polyvinylamine molecular skeleton, polyether and an isothiocyanate fluorescein fluorophore. The invention also provides a preparation method of the Cu < 2 + > ion fluorescence chemical sensor and an application of the Cu < 2 + > ion fluorescence chemical sensor in detection of Cu < 2 + > ions in a solution, which are further expanded to the field of cell imaging and realize the application of Cu < 2 + > ion detection in an intracellular environment. The invention provides application of fluorescein isothiocyanate in preparation of a Cu < 2 + > ion fluorescence chemical sensor. The Cu < 2 + > ion fluorescence chemical sensor is based on a polyvinylamine molecular skeleton, polyether macromolecules and a fluorophore are introduced at the same time, the Cu < 2 + > ion change in cells can be responded, and a new application way of fluorescein isothiocyanate is provided.

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.

The application belongs to the field of electroluminescence, and discloses an organic light-emitting compound, an organic electroluminescent composition, a light-emitting device and a display device. The structure of the organic light-emitting compound is shown in formula I; formula I; wherein L1 and L2 are independently selected from a substituted or unsubstituted aromatic group or heteroaromatic group with 6-30 ring atoms; R1 and R2 are independently selected from H, D, a cyano group, a carbamoyl group, a halogen formyl group, a formyl group, an isocyano group, an isocyanate group, a thiocyanate group, an isothiocyanate group, a hydroxyl group, a nitro group, CF3, Cl, Br, F, a first group with 1-20 carbon atoms, a second group with 2-20 carbon atoms, a third group with 3-20 carbon atoms, a fourth group with 7-20 carbon atoms, a fifth group with 5-40 ring atoms, or a combination of the groups. The organic light-emitting compound provided by the application has good photoelectric performance and can be applied to an organic electroluminescent device as a light-emitting guest material.

The application discloses a recyclable adhesive suitable for bonding different substrates and a preparation method and application thereof, and relates to the technical field of adhesives. The recyclable adhesive comprises the following components in parts by weight: 20-40 parts of a polyamine monomer, 3-8 parts of a diisothiocyanate monomer and 3-8 parts of modified tannic acid. The preparation method comprises the following steps: preparing modified tannic acid; mixing the diisothiocyanate and the polyamine monomer to generate an isothiocyanate group-terminated prepolymer; and mixing the modified tannic acid and the isothiocyanate group-terminated prepolymer, covalently cross-linking through a Michael addition reaction to obtain the recyclable adhesive.

The invention belongs to the technical field of biology, and provides a mycobacterium tuberculosis detection method and a kit, the detection method comprises the following steps: adding a to-be-detected sample containing mycobacterium tuberculosis into a lysis working solution, carrying out a heat preservation reaction, centrifuging, and taking a supernatant, the cracking working solution contains a biotinylated metal complexing agent and biotinylated nanoparticles, and guanidine isothiocyanate and hydrophobic alkyl groups are connected to the biotinylated nanoparticles; adding a magnetic bead suspension into the supernatant, stirring at room temperature for reaction, standing, taking an upper solution, adding the upper solution into a purification column, purifying and washing to obtain a detection sample, and the surface of a magnetic bead contains streptavidin; and adding a detection sample into an amplification reagent for fluorescent PCR amplification, and analyzing a PCR amplification product by using a fluorescence melting curve to finish detection. The method can effectively reduce impurities contained in the detection sample and improve the detection accuracy.

The present invention relates to a curable photochromic composition comprising (a) a photochromic compound; (b) a segmented polymer having active hydrogen groups, at least a first segment, and at least a second segment, wherein (i) each first segment independently includes a fluorinated polymer segment, and (ii) each second segment independently includes a segment selected from a polycarbonate segment, a polyester segment, a polyether segment, a polyurethane segment, and a copolymer segment thereof; and (c) a curing agent having reactive functional groups that are reactive with the active hydrogen groups of the segmented polymer, wherein the curing agent includes at least one polyisocyanate, polyisothiocyanate, or aminoplast. Photochromic articles and films, including multilayer articles, comprising the curable photochromic composition are also provided.

Proposed is a porous silicon nanoparticle with isothiocyanate moiety conjugated to the surface. The porous silicon nanoparticle with isothiocyanate moiety conjugated to the surface has low side effects due to high biocompatibility, and can generate reactive oxygen species in cells without an external initiator, which can promote decomposition and release of supported drugs.

The invention discloses a plasma free DNA extraction reagent, a kit and an extraction method, the extraction reagent comprises protease K, a lysis solution, a binding solution, a washing solution 1, a washing solution 2, a washing solution 3 and an eluent, the extraction reagents contain more common and less-dosage common reagents such as Tris-HCl (pH 8.0), EDTA.2Na. 2H2O, NaCl, glycerol, SDS, isopropanol, ethanol, Tween-20 and the like. The method has the advantages that the problems that the reagent is easy to separate out and needs to be heated and redissolved for use during storage can be solved without traditional high-concentration guanidine salts such as guanidine hydrochloride and guanidinium isothiocyanate, the stability and the operation convenience of the extraction reagent are increased, a better extraction effect is achieved, and the eluent can effectively protect the extracted cfDNA from being degraded.

The invention relates to the field of organic synthesis methodology, in particular to a quinazoline dihydroimidazole thione derivative and a preparation method and application thereof.The quinazoline dihydroimidazole thione derivative is prepared by reacting aryl glyoxal, o-aminobenzene amine, aryl isothiocyanate and an additive at a certain temperature under the closed condition and the solvent condition. The method has the characteristics that the catalyst is cheap and easy to obtain, the raw materials are easy to obtain, the operation is simple, the reaction time is short, the yield is relatively high, the functional group compatibility of the substrate is good, a series of quinazoline and dihydroimidazole thione derivatives can be synthesized, and the method has a good potential application value.