458 results about "Triphenylphosphine" patented technology

The invention provides a preparation method of mitochondria-targeted antioxidant hybrid vesicles. The preparation method comprises the following steps: S1, preparing and separating adipose-derived stem cell nano-vesicles; s2, preparing a liposome loaded with dihydromyricetin and distearoyl phosphatidyl ethanolamine-polyethylene glycol 2000-triphenylphosphine targeting peptide by an ethanol injection method; and S3, preparing the hybrid nano vesicles loaded with the dihydromyricetin and the distearoyl phosphatidyl ethanolamine-polyethylene glycol 2000-triphenylphosphine targeting peptide. The invention also provides the hybrid vesicles prepared by the method and application of the hybrid vesicles in preparation of refractory diabetes wound treatment drugs. The lipidosome and the adipose-derived stem cell nano-vesicles are hybridized to prepare the hybridized vesicles capable of targeting mitochondria and resisting oxidation, the hybridized vesicles are applied to wound treatment for the first time, the problem of oxidative stress of diabetic wounds is solved, wound healing is accelerated, and a new strategy is provided for optimizing mitochondrial function defects and oxidative stress of the diabetic wounds.

The application discloses a preparation method of carbon aerogel material for light electromagnetic shielding, and comprises the following steps: adding resorcinol, phloroglucinol, a template agent and formaldehyde into pure water, stirring and dissolving to obtain a precursor solution; adding the precursor solution into white oil containing a surfactant, emulsifying, heating in an oil bath and fully reacting; centrifugal separation to obtain powder, high-temperature carbonization, dispersion in oleylamine, addition into a stock solution containing nickel acetylacetonate, triphenylphosphine and oleylamine, high-temperature reaction and cooling, addition of a mixture of hexane and ethanol to obtain a product; centrifugal separation and washing to obtain light high-electromagnetic-shielding carbon aerogel. The carbon aerogel material for light electromagnetic shielding prepared by the method has the advantages of small density, high efficiency, corrosion resistance, high electromagnetic shielding efficiency, high product yield and the like, and by controlling the nucleation and growth rate of Ni2P, the Ni2P nanoparticles can be uniformly grown on the carbon aerogel microspheres, and the method is suitable for application in large-scale industrial production.

The invention discloses a high-bonding-strength conductive adhesive and a preparation method and application thereof.The preparation method comprises the following steps that S1, epoxy resin E51 is placed in a three-neck flask, acetone is added, stirring is conducted till the epoxy resin E51 is completely dissolved, and ethidene diamine is slowly dropwise added; s2, under the protection of nitrogen, heating to 70-80 DEG C, adding a catalyst triphenylphosphine, carrying out a constant-temperature reaction, after the reaction is completed, cooling to 35-45 DEG C, adding deionized water, and stirring; s3, acetone and unreacted ethylenediamine are removed, then deionized water is used for washing, an obtained product is placed in a vacuum drying oven to be dried, and amino modified epoxy resin of faint yellow viscous liquid is obtained; s4, mixing the amino modified epoxy resin with an anhydride curing agent, a conductive filler, a diluent and a coupling agent; and S5, fully stirring the mixture, carrying out vacuum defoaming, and uniformly stirring to obtain the conductive adhesive. According to the invention, the shearing strength of the chip and the copper bracket can be improved to more than 30MPa.

The invention relates to the technical field of protective films, in particular to a high-light-transmittance label protective film and a preparation method thereof.A multi-layer protective film formed by compounding a release film layer, an adhesive layer, a PET film and a protective layer is constructed; composite vinyl ester resin constructed by taking epoxy resin and acrylic acid as raw materials is subjected to toughening modification, and then a linear reactive diluent is compounded to construct a high-toughness protective layer which is resistant to high temperature and aging and can be photo-cured; long-chain alkane modified nano silicon dioxide is introduced into the protective coating, nano silicon dioxide is aminated by 3-aminopropyltriethoxysilane, and then 17-carbon monoisocyanate prepared by taking acetone, stearic acid, triphenylphosphine, sodium azide and N-chlorosuccinimide as raw materials is grafted to form the long-chain alkane modified nano silicon dioxide. Vinyl butadiene styrene rubber, composite vinyl ester resin, tackifying resin, a softening agent and a photoinitiator are mixed to prepare the adhesive layer.

The invention relates to a specific PET molecular probe of a targeted KRASG12D mutant as well as a preparation method and application of the specific PET molecular probe. Pyridopyrimidine compounds and R5 are subjected to cooling reaction under the action of N, N-diisopropylethylamine to generate a compound 2; the compound 2 and (2-fluorotetrahydro-1H-pyrrolizine-7A (5H)-yl) methanol are subjected to a heating reaction under the action of N, N-diisopropylethylamine, and a compound 3 is generated; carrying out heating reaction on the compound 3 and biphenyl boronic acid pinacol ester under the action of N, N-diisopropylethylamine and tetrakis (triphenylphosphine) palladium to generate a compound 4; carrying out heating reaction on the compound 4 and 1, 2-bis (tolyloxy) alkane under the action of potassium carbonate to generate a compound 5; the compound 5, radioisotope < 18 > F and an anion complexing agent are subjected to a heating reaction under the action of potassium carbonate to generate the trisubstituted pyridopyrimidine < 18 > F labeled PET molecular probe. Compared with the prior art, the kit has a positioning diagnosis effect on KRASG12D mutant tumors, and image typing of mutant and non-mutant tumors and pathological evaluation after tumor treatment are realized at the same time.

The invention discloses a preparation method of 3, 6-dichloropyridazine, and belongs to the technical field of chemistry. According to the method, 3, 6-dihydroxypyridazine is used as a raw material, an organic solvent and triphenylphosphine oxide are combined to form a dichlorotriphenylphosphine intermediate state which is used as a chlorinating agent, dihydroxyl is substituted to generate 3, 6-dichloropyridazine, triphenylphosphine oxide and solid light are used as raw materials, heating reaction is performed to prepare 3, 6-dichloropyridazine, meanwhile, a one-pot method can be adopted in the two-step reaction, and operation is easy and convenient. The novel preparation method for synthesizing 3, 6-dichloropyridazine provided by the invention has the advantages of low raw material cost, high yield, high gas phase purity and no pollution, is suitable for industrial production, can meet industrial requirements, provides a new idea for later preparation of 3, 6-dichloropyridazine, has the remarkable advantages of high gas phase purity and high yield, and is suitable for industrial production. Wide application prospects are realized.

The invention belongs to the technical field of light-emitting hybrid materials, and particularly discloses a preparation method and application of an efficient blue light emitting hybrid material. The preparation method comprises the following steps: dispersing cuprous halide, triphenylphosphine (tpp) and tetraethylammonium halide in N, N-dimethylformamide (DMF) according to a molar ratio of 1: 1: 1 to form a uniform solution, and performing ultrasonic treatment at room temperature to generate luminescent powder; and washing, centrifuging and drying in vacuum to obtain the hybrid material. The highest photoluminescence quantum yield is up to 70%, and the luminescence mechanism is thermally activated delayed fluorescence. The material can be used for a white light LED (CIE coordinate (0.33, 0.33)) and an X-ray scintillator (the light yield is 32537 photons / MeV, and the spatial resolution is 20lpmm <-1 >), and has the characteristics of simple preparation and excellent performance.

The invention relates to the technical field of biomedical materials, in particular to a preparation method of TPP-mediated mitochondrial-targeted cerium-doped antioxidant carbon quantum dots, which comprises the following steps: mixing citric acid, urea and cerium salt serving as raw materials, and reacting by adopting a hydrothermal method to synthesize the cerium-doped carbon quantum dots; then triphenylphosphine is grafted to the surface of the cerium-doped carbon quantum dot through an amide method, separation and purification are carried out after the reaction is completed, the target carbon quantum dot is obtained, and the cerium element in the cerium salt is used for endowing the carbon quantum dot with an anti-oxidation function. The carbon quantum dots prepared by the method are accurate in mitochondria targeting and strong in oxidation resistance, the preparation process is simple, convenient, environment-friendly and large-scale, and the product is uniform in particle size, stable in fluorescence, good in biocompatibility and wide in application prospect in the field of biomedicine.

The invention discloses an agricultural synergist containing astragalus polysaccharide and application of the agricultural synergist, and belongs to the technical field of killing agents for biopesticides. The synergist comprises astragalus polysaccharide, a polysorbate / lecithin compound emulsifier, a carboxymethyl chitosan / siloxane penetrant and a modified accelerant synthesized by palladium catalysis. Polysaccharide is structurally modified through a blue light LED induced tetra (triphenylphosphine) palladium catalytic reaction, and the epidermal penetration efficiency of the biopesticide on tetranychus urticae is improved by 3.2 times in combination with the synergistic permeation effect of a siloxane derivative. The mite killing rate of the suspending agent prepared according to a preferable formula reaches 92.5% within 24 hours, and the lasting period is prolonged to 14 days. The system overcomes the defects of slow effectiveness and poor stability of the traditional biopesticide, by means of a targeted combination mechanism of natural components, the environment friendliness is kept while the original pesticide dosage is reduced by 50%, and the system is particularly suitable for the pest control requirement of organic agriculture.

The invention provides a method for recovering rhodium in organic residual liquid containing triphenylphosphine / phosphine oxide, and relates to the technical field of precious metal recovery, and the method comprises the following steps: S1, carrying out reduced pressure rectification on the organic residual liquid containing triphenylphosphine / phosphine oxide to remove volatile components until the indexes of the residual liquid meet the feeding requirements of a subsequent process, and collecting light components for independent storage; s2, adding an acidic medium into the organic phase after light component removal, stirring and heating, introducing an oxidizing agent to carry out oxidation-complexation reaction, maintaining reaction conditions until the reaction is complete, standing for phase splitting, and collecting a water phase containing rhodium complex ions; according to the method, a core process combining oxidation-chlorination transfer and anion exchange adsorption is adopted, and key parameters of each process are accurately controlled, so that the rhodium recovery rate is stabilized at 95% or above, the rhodium content in the residual liquid can be reduced to 5 ppm or below, the industrial emission standard is completely met, and compared with the prior art, the resource recovery efficiency is greatly improved, and the cost is reduced. And waste of precious metal resources is effectively reduced.

The invention discloses a high-temperature-resistant and aging-resistant polyurethane structural adhesive and a preparation method thereof, and belongs to the technical field of structural adhesives. The high-temperature-resistant and aging-resistant polyurethane structural adhesive consists of a component A and a component B, wherein the component A is prepared from the following raw materials in parts by mass: 50 to 90 parts of first polyol, 20 to 40 parts of first filler, 10 to 20 parts of flame retardant, 5 to 15 parts of enhancer, 1 to 3 parts of thixotropic agent, 3 to 5 parts of molecular sieve, 0.1 to 1.0 part of antioxidant, 0.01 to 0.05 part of polyurethane environment-friendly organic bismuth catalyst BCAT-E20 and 0.01 to 0.05 part of triphenylphosphine; the component B is prepared from the following raw materials in parts by mass: 40 to 100 parts of isocyanate prepolymer and 10 to 50 parts of second filler. The invention also provides a preparation method of the composition. Compared with the prior art, the high-temperature-resistant and aging-resistant polyurethane structural adhesive prepared by the invention has the advantages of high impact resistance, high interface bonding strength, good flame retardance, high thermal aging resistance and the like.

The invention discloses a high-strength acrylate rubber material and a preparation method thereof, and relates to the technical field of high polymer materials. When the high-strength acrylate rubber material is prepared, polyhydroxy imidazolium salt and phosphorus pentoxide react to prepare a functional flame retardant; reacting the pre-modified glass fiber with hydrazine hydrate to obtain modified glass fiber; the preparation method comprises the following steps: carrying out solution polymerization on ethyl acrylate, butyl acrylate, acryloxy propyl bis (trimethylsiloxy) methylsilane and glycidyl methacrylate to prepare acrylate raw rubber; the high-strength acrylate rubber material is prepared by uniformly mixing acrylate raw rubber, the modified glass fiber, a functional flame retardant and triphenyl phosphine, plastifying and thin-passing. The high-strength acrylate rubber material prepared by the invention has excellent flame-retardant, antibacterial, anti-aging and mechanical properties.

The invention discloses a tellurium-doped carbon quantum dot and a preparation method and application thereof, the tellurium-doped carbon quantum dot is obtained by using 2, 2 '-diaminodiphenyl telluride as a precursor, the average particle size is 1.9 nm, the thickness is about 2.1 nm, and the surface is rich in amino groups. And fixing (4-carboxybutyl) triphenylphosphonium bromide, 3-morpholinopropionic acid or 3-((4-methylphenyl) sulfonamide) propionic acid on the surfaces of the tellurium-doped carbon quantum dots to prepare Mito-Te-CDs, Lyso-Te-CDs and ER-Te-CDs with an organelle targeting function. The Mito-Te-CDs, the Lyso-Te-CDs and the ER-Te-CDs are good in biocompatibility, can be used as fluorescent probes for targeted imaging of organelles, can be used for recognition and removal of superoxide anions in specific organelles, have a protection effect on cells and can be used for effectively treating acute kidney injury.

The invention provides a synthesis method of an OLED polycyclic fused thiophene compound, and relates to the technical field of material synthesis, and the synthesis method comprises the following steps: providing and mixing 2-naphthalene sulfonic acid and dichloromethane, dropwise adding an N-bromosuccinimide solution into the mixture under the protection of inert gas, and reacting to obtain an intermediate A; dissolving the intermediate A, then adding sodium hydroxide, 4-bromophenylboronic acid, water and tetrakis (triphenylphosphine) palladium, and reacting to obtain an intermediate B; dissolving the intermediate B, adding sulfonic acid and phosphorus pentoxide, and reacting to obtain an intermediate C; adding the intermediate C into tetrahydrofuran, dissolving, adding lithium aluminum hydride under inert gas, and reacting to obtain a target compound. According to the method, the chemical reaction efficiency of the intermediate C is high, and the yield and LC purity of a target product are relatively high.

The invention relates to the field of Karstedt catalysts, and discloses a stable-structure Karstedt catalyst for silane modified polyether synthesis, and the stable-structure Karstedt catalyst is prepared from the following raw materials in parts by weight: 2-4 parts of a Karstedt catalyst, 5-8 parts of a polyether siloxane block copolymer, 1-3 parts of nano silicon dioxide, 0.5-1.5 parts of triphenylphosphine, 20-25 parts of propylene glycol monomethyl ether and 0.5-1.0 part of an organosiloxane coupling agent. A polyether siloxane block copolymer is introduced into a Karstedt Catalyst system, and a flexible coating layer is formed outside a catalytic center by utilizing molecular compatibility of a silicon-oxygen chain segment of the polyether siloxane block copolymer and a platinum ligand, so that the exposure degree of the platinum center is remarkably reduced, interference of moisture and polar impurities in air is effectively inhibited, and the catalytic activity of the catalyst is improved. Therefore, the oxidation resistance and the storage stability of the catalyst are improved.

The invention discloses a preparation method of a hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked heterogeneous catalyst and an application of the catalyst in catalysis of a cycloaddition reaction of CO2 and epoxide. Trimethoxytriphenylphosphine and dibromo-p-xylene are firstly subjected to quaternary phosphating to form triphenylphosphine-based ionic liquid, and then the triphenylphosphine-based ionic liquid and biphenyl benzyl dichloride can be subjected to aromatic electrophilic substitution reaction in the presence of 1, 2-dichloroethane serving as a solvent and anhydrous aluminum chloride serving as a Lewis acid catalyst to realize cross-linking, so that the triphenylphosphine-based ionic liquid can be prepared. And methoxy can be removed to form hydroxyl, so that the hydroxyl-functionalized quaternary phosphonium salt polyion liquid super-crosslinked polymer is prepared in one step. The resulting heterogeneous catalyst effectively converts CO2 to cyclic carbonates under milder conditions (80 DEG C, 1 atm) in the absence of a soluble co-catalyst.

The invention discloses a high-corrosion-resistance electrophoretic coating and a preparation method thereof, and belongs to the technical field of electrophoretic coatings. The preparation method of the coating comprises the following steps: S1, mixing epoxy resin, a thioether compound with an active group at the end position, a chain extender, triphenylphosphine, an organic solvent 2, an amino catalyst and a neutralizer, and carrying out heat preservation and chain extension to obtain thioether modified epoxy resin; s2, aminating, neutralizing and re-emulsifying the thioether modified epoxy resin in the step S1, an aminating agent, an organic solvent 1, a curing agent, a neutralizing agent and deionized water to obtain a high-corrosion-resistance emulsion; s3, mixing and grinding the thioether modified epoxy resin in the step S1 with pigment, a dispersing agent and deionized water to obtain high-corrosion-resistance color paste; s4, mixing the high-corrosion-resistance emulsion in S2 and the high-corrosion-resistance color paste in S3 according to the mass ratio of 4: 1 to 8: 1 to obtain the high-corrosion-resistance electrophoretic coating. And by adopting the thioether modified epoxy resin, the obtained coating has excellent corrosion resistance, mechanical property and flame retardant property at the same time.

The application discloses an organic compound biological probe and a preparation method and application thereof, and belongs to the field of fluorescent probes. The structural formula of the organic compound biological probe is as follows, and the preparation method comprises the following steps: adding 2,4-dihydroxybenzaldehyde and anhydrous potassium carbonate into anhydrous acetonitrile or DMF, then dropwise adding 1,4-dibromobutane to obtain a colorless oily compound 1 through reflux reaction; dissolving the compound 1 and triphenylphosphine in anhydrous acetonitrile to obtain a solid compound 2 through reflux reaction; dissolving 1,1,2-trimethyl-1H-benzo[e]indole and iodoethane in anhydrous acetonitrile to obtain a compound 3 through reflux; dissolving the compound 3 and the compound 2 in anhydrous ethanol, adding piperidine, and then performing reflux reaction and purification to obtain the organic compound biological probe. The organic compound biological probe can self-assemble into nanoparticles with a size of about 1.6 nm in water, has strong anti-photobleaching ability, and integrates red light and near-infrared dual-channel imaging, pH detection, mitochondrion targeting and chemotherapy.

The application discloses a preparation method of beta-carotene, which comprises the following steps: 3-methyl-5-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4-pentadienyl triphenyl phosphonium salt (C15 phosphonium salt) cis-trans isomer and 2,7-dimethyl-2,4,6-octatriene-1,8-dial (C10) are dissolved in a water and a water incompatible solvent system, and Wittig reaction is generated under the action of an alkali. The reaction system can avoid that by-product inorganic salt is wrapped in the product, and the content of inorganic salt impurities in the product is reduced. In addition, the proportion of C15 phosphonium salt cis-trans isomer is controlled, a C15 phosphonium salt hydrolysis side reaction is inhibited, and the reaction yield is improved.

The present invention relates to a method for preparing triphenylphosphine, comprising performing heat treatment on a chlorodiphenylphosphine raw material at a temperature of 280-480°C to prepare triphenylphosphine, wherein the content of dichlorophenylphosphine in the chlorodiphenylphosphine raw material does not exceed 35 wt%, based on the total weight of the chlorodiphenylphosphine raw material.

The invention discloses a preparation method of (R)-3-aminotetrahydrofuran hydrochloride, and belongs to the technical field of organic medicine intermediates. The preparation method comprises the following steps: taking (S)-3-hydroxytetrahydrofuran and triphenylmethylamine as raw materials, and reacting in the presence of triphenylphosphine and an azo reagent to generate (R)-N-triphenylmethylhydrofuran-3-amine; and the (R)-N-triphenylmethylhydrofuran-3-amine is subjected to deprotection in an alcohol solvent in the presence of hydrochloric acid to form a salt so as to generate the (R)-3-aminotetrahydrofuran hydrochloride. According to the invention, triphenylphosphine and an azo catalyst are adopted to carry out Mitsunobu reaction, configuration inversion is realized, the conversion rate is high, the method is suitable for industrial production, and reference is provided for synthesis of the compounds.

The present disclosure provides a composition for modifying the surface of mitochondria, comprising: a polymer backbone; a first chemical moiety conjugated to the polymer backbone, the chemical moiety comprising a peptide; and a second chemical moiety conjugated to the polymer backbone, the second chemical moiety comprising triphenylphosphine. The disclosure also provides a hydrogel comprising a plurality of hydrogel particles, each particle comprising a first polymer crosslinked with an enzyme cleavable peptide to form a crosslinked polymer and at least one mitochondria, wherein each hydrogel particle has an average diameter no greater than 100 microns. Methods of treating a disease and / or injury in a subject by administering the hydrogel are also provided.

The invention discloses a method for preparing a fluorine-containing compound and its application, and relates to the technical field of perovskite material additives. The preparation method is as follows: naphthaleneboric acid, potassium carbonate and bis(triphenylphosphine)palladium chloride are added to a drying container, the container is evacuated to a vacuum state and then filled with nitrogen, phenylacetylene and nine fluoro-4-iodobutane are added to the container, dichloromethane and distilled water are then added to the container, and heated for reaction; the obtained reaction mixture is subjected to extraction and drying, separation and purification, and a fluorine-containing compound is obtained. The fluorine-containing compound prepared by the present invention has good compatibility with the perovskite material, and there will be no heterogeneous phase generation; it is applied as an additive in the perovskite material to suppress the migration and loss of ions, reduce the defect state density at the perovskite grain boundary, extend the carrier lifetime, and improve the charge transfer efficiency; it can also promote the nucleation and growth of perovskite, and improve the quality and morphology of the perovskite film.

The invention discloses a synthesis method of an inner piroxostat key intermediate and a synthesis method of inner piroxostat. The invention provides a novel synthesis method of an inner piroxostat key intermediate 5, 7-difluoro-1, 2, 3, 4-tetrahydronaphthalene-2-amine, which comprises the following steps: taking 3, 5-difluorobenzyl bromide as a raw material, carrying out substitution reaction on the 3, 5-difluorobenzyl bromide and methane tricarboxylic acid triethyl ester, then carrying out hydrolysis decarboxylation, adding 1, 2, 3, 4-tetrahydronaphthalene-2-amine, and carrying out reaction to obtain the 5, 7-difluoro-1, 2, 3, 4-tetrahydronaphthalene-2-amine. The preparation method comprises the following steps: substituting 1, 2-diiodoethane, catalyzing carbon-hydrogen activation and ring closing by tetrakis (triphenylphosphine) palladium, hydrolyzing and decarboxylating, amidating, and carrying out Hofmann degradation reaction to obtain a target intermediate. The method has the advantages of cheap and easily available raw materials, simple synthesis and high yield, avoids the use of ethylene, sodium azide and other reagents, and is green and safe. The invention provides a method for further synthesizing the endopiroxostat based on the synthesis method, the method comprises a novel endopiroxostat hydrochloride chiral resolution method, the chiral pure endopiroxostat is conveniently prepared through a chiral preparative column, and the ee value is 100%.

The invention discloses four-arm polyethylene glycol amine as well as a preparation method and application thereof, relates to the technical field of high polymer materials, and solves the problems of poor comprehensive properties such as strength, fatigue resistance and swelling resistance when traditional dual-network hydrogel is applied to preparation of a cartilage repair material in the prior art. The molecular weight of four-arm polyethylene glycol amine provided by the invention is 10 kDa or 40 kDa, four-arm polyethylene glycol, phthalimide, diisopropyl azodicarboxylate and triphenylphosphine are subjected to a Mitsunobu reaction and hydrazinolysis, and the four-arm polyethylene glycol amine with the molecular weight of 10 kDa is obtained; four-arm polyethylene glycol, phthalimide, diisopropyl azodicarboxylate and triphenylphosphine are subjected to a Mitsunobu reaction and hydrazinolysis, and four-arm polyethylene glycol amine with the molecular weight of 40 kDa is obtained. The double-network hydrogel prepared from the four-arm polyethylene glycol amine has excellent comprehensive performance such as high mechanical strength, fatigue resistance, self-recovery performance and swelling resistance, and can be applied to preparation of cartilage-like materials.

This invention provides a high-solids anti-rust primer suitable for all seasons and its preparation method. The anti-rust primer comprises component A and component B. Component A includes the following raw materials in parts by weight: 30-40% bisphenol F epoxy resin, 1-10% reactive diluent, 1-8% liquid carboxyl-terminated nitrile butadiene rubber (CTBN), 0.1-0.3% triphenylphosphine, 0.1-0.6% dispersant, 0.2-0.6% defoamer, 1-5% modified chopped glass fiber, 40-50% pigments and fillers, 0.7-1.3% thixotropic agent, and 3-5% solvent. Component B includes the following raw materials in parts by weight: 50-70% amine curing agent, 2-5% hyperbranched epoxy resin, and 25-45% modified ketimide curing agent. The anti-rust primer of this invention has the advantages of high solids content and high flexibility, and can be applied to damp surfaces and in ambient temperatures ranging from -10 to 40°C. Furthermore, the prepared anti-rust primer, as a coating, can be used as a rust-preventive primer for multiple parts of the ship, from the bottom to the hull, and has significant benefits in improving ship painting efficiency and reducing fugitive VOC emissions during the painting process.

The invention discloses a preparation method of beta-carotene. The preparation method comprises the following steps: dissolving an aqueous solution of 3-methyl-5-(2, 6, 6-trimethyl-1-cyclohexene-1-yl)-2, 4-pentadienyl triphenylphosphine salt (C15 phosphine salt) and 2, 7-dimethyl-2, 4, 6-octtriene-1, 8-dialdehyde (C10) cis-trans isomer in a solvent, carrying out wittig reaction under the action of alkali, and carrying out isomerization to obtain the product. By controlling the proportion of C10 cis-trans isomers of the reaction system, the content of the C25 aldehyde intermediate can be reduced, and the reaction yield and the product quality can be improved.

The invention provides a perovskite quantum dot compound and a preparation method and application thereof. The preparation method of the perovskite quantum dot compound comprises the following steps: preparing a mixture containing a triphenylphosphine halide copolymer, carrier particles, a first cationic precursor and a second cationic precursor; the A comprises one or more of CH3NH3 +, CH3CH2NH3 +, (CH3) 2CHNH3 +, CH (NH2) 2 +, Ar-CH3CH2NH3 +, Li < + >, Na < + >, K < + >, Rb < + > and Cs < + >; b comprises one or more of Pb < 2 + >, Sn < 2 + >, Be < 2 + >, Mg < 2 + >, Ca < 2 + >, Sr < 2 + >, Ba < 2 + >, Zn < 2 + >, Ge < 2 + >, Fe < 2 + >, Co < 2 + > and Ni < 2 + >; x comprises one or more of Cl <->, Br <-> and I <->; after the reaction is finished, a powdery or granular perovskite quantum dot compound is obtained, perovskite quantum dots are dispersed in a triphenylphosphine halide copolymer, and the triphenylphosphine halide copolymer coats the surfaces of carrier particles. The preparation method is low in cost, energy-saving and simple.

The present invention discloses a one-time pultruded large-section insulating core rod for avoiding thermal stress cracking and a preparation method thereof, including a rod body with a diameter of 280-400 mm. The center position of the rod body is an inner ring part, a middle ring part located outside the inner ring part, and an outer ring part located outside the middle part. Glass fibers are axially distributed in the inner ring part, the middle ring part, and the outer ring part, and epoxy resin and a curing agent are filled between the glass fibers; the epoxy resin in the inner ring part contains a first curing accelerator; the epoxy resin in the middle ring part contains a second curing accelerator; the epoxy resin in the outer ring part contains a third curing accelerator; the first curing accelerator is imidazole; the second curing accelerator is triphenylphosphine; the third curing accelerator is tetrabutylphosphonium bromide. By selecting different curing accelerators, the curing rates of the epoxy resins at different positions are different, and the curing temperatures are different, so that the inner part is cured first and the outer part is cured last, so that the thermal stress will not concentrate, and effective heat transfer is achieved, so that no cracks will be generated inside the core rod.

The application discloses a green preparation method of a medium-chain acylated hydroxytyrosol lipoid-triphenylphosphine derivative and application of the derivative in mitochondrial-targeted antioxidation, and relates to the following steps: taking hydroxytyrosol and saturated halogenated fatty acids with medium-chain length C8-C12 as raw materials, and synthesizing a medium-chain hydroxytyrosol lipoid compound through a low-field ultrasonic coupling immobilized lipase synergistic directional alcohol hydroxyl acylation reaction; and further synthesizing the lipoid compound through high-speed stirring reaction with a triphenylphosphine compound to obtain a medium-chain acylated hydroxytyrosol lipoid-triphenylphosphine derivative. The derivative has the antioxidation effect of mitochondrial-targeted enrichment and active oxygen radical scavenging. The hydroxytyrosol derivative prepared by the application has the characteristics of green efficiency, directional bonding and simple operation. The acylation reaction of hydroxytyrosol does not need to involve flammable and explosive, easily oxidized and corrosive concentrated sulfuric acid and concentrated nitric acid, and the medium-chain acylated hydroxytyrosol lipoid-triphenylphosphine derivative has mitochondrial targeting, can be used as a potential mitochondrial nutritional supplement product, and has a wide application prospect in the health care functions of anti-aging, cardiovascular protection, diabetes prevention and the like.