182 results about "Disulfide compound" patented technology

The invention discloses a dual-band acridine formic acid anthracene methyl ester photocatalyst as well as a preparation method and application thereof, and belongs to the field of heterocyclic compounds. The invention designs and synthesizes a novel acridine formic acid anthracene methyl ester photocatalyst, which has good compatibility in two wavebands of 365 nm and 405 nm, can realize photocatalysis of disulfide compounds and aryl formyl peroxide compounds, and provides a new thought for preparation of sulfoxide compounds with asymmetric structures; the reaction conditions are mild, the reaction time is short, the photocatalyst can be recycled, the circulation loss is low, the circulation efficiency is high, the production efficiency is greatly improved, and the production period and cost are reduced; the product is free of transition metal residues and high in yield.

The invention belongs to the technical field of epoxy resin, and particularly relates to double-dynamic-bond synergistic exchange epoxy resin as well as a preparation method and application thereof. The preparation method of the double dynamic bond synergistic exchange epoxy resin comprises the following steps: adding aromatic dialdehyde and amino-containing disulfide into a solvent for condensation reaction, and filtering and drying to obtain a double dynamic bond curing agent; the preparation method comprises the following steps: adding the double-dynamic-bond curing agent into epoxy resin, carrying out ring-opening addition reaction, carrying out gradient heating curing, and cooling to room temperature, the aromatic dialdehyde is terephthalaldehyde, isophthalaldehyde or o-phthalaldehyde, and the amino-containing disulfide is 2, 2 '-diaminodiphenyl disulfide or 4, 4'-diaminodiphenyl disulfide. The invention designs and synthesizes a double-dynamic covalent bond curing agent containing an imine bond and a disulfide bond, and is used for constructing a novel degradable and self-healing epoxy resin. The material maintains good thermal stability and insulation performance, and realizes degradation and self-healing functions at the same time.

The invention provides a high-elasticity tear-resistant silicone rubber material and a preparation method thereof.The high-elasticity tear-resistant silicone rubber material is characterized by being prepared from, by mass, 100 parts of vinyl polysiloxane, 5-15 parts of phenylboronic acid end group modified polydimethylsiloxane and 1-5 parts of 2, 3-dihydroxypropyl disulfide, the adhesive comprises the following components in parts by mass: 10-30 parts of fumed silica, 1-5 parts of a cross-linking agent, 1-2 parts of a plasticizer and 0.001-0.005 part of a catalyst. By introducing the combination of phenylboronic acid end group modified polydimethylsiloxane and 2, 3-dihydroxypropyl disulfide, a dual dynamic covalent bond network with a stress triggering characteristic is constructed in a silicone rubber system, and when the material is subjected to external force, a disulfide bond is used as a sacrificial unit to preferentially break to dissipate energy and generate micro-voids, so that the stress triggering performance of the material is improved. And then stress-triggered boric acid ester bond dynamic recombination further disperses stress and stabilizes a micro-cavity structure, so that graded dissipation of energy is realized, crack propagation is reduced, and the elasticity and tear resistance of the material are improved.

The invention discloses a double dynamic bond self-repairing polyurethane elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The elastomer is prepared from the following raw materials in percentage by mass: 74 to 76 percent of polyether polyol, 15.5 to 18 percent of diisocyanate, 1.67 to 7 percent of dihydrazide compound and 2.1 to 6.7 percent of disulfide. The preparation method comprises the following steps: firstly, reacting polyether polyol with diisocyanate to obtain a prepolymer, then sequentially carrying out step-by-step chain extension reaction on the prepolymer, the bishydrazide compound and the disulfide compound, and finally, curing and forming. According to the invention, a synergistic structure of a hydrogen bond hard segment and a disulfide bond soft segment is constructed step by step, so that the material has high mechanical properties and efficient self-repairing capability. The elastomer is suitable for the fields of industrial pipeline sealing pieces, flexible packaging films, sports equipment accessories and the like, and solves the problem that the strength and repairing performance of an existing self-repairing polyurethane material are difficult to balance.

The application discloses a preparation method of a photo-thermal ice-resistant super-hydrophobic coating and the super-hydrophobic coating, and comprises the following steps: heating and vacuumizing polytetrahydrofuran (PTMG) to remove water, so as to obtain PTMG after water removal; heating and vacuumizing hydroxypropyl-terminated polydimethylsiloxane (PDMS-OH) to remove water, so as to obtain PDMS-OH after water removal; mixing the PDMS-OH after water removal and the PTMG after water removal, adding ethyl acetate solvent to stir, adding dicyclohexylmethane diisocyanate (HMDI) and dibutyltin dilaurate (DBTDL) dropwise, pre-polymerizing, adding di(2-hydroxyethyl) disulfide (HEDS) when the reaction reaches equilibrium, and preparing polyurethane after the reaction is completed; mixing ZrN nanoparticles, SiO2-F and the polyurethane to obtain a suspension through ultrasonic treatment; spraying the suspension to obtain a coating, and drying the coating to obtain the photo-thermal ice-resistant super-hydrophobic coating. The coating prepared by the application has excellent ice-resistant performance, and can delay the icing time for up to 1422s at-20 DEG C, and the icing time of a blank control group is 17s, which is better than most of the known ice-resistant super-hydrophobic coatings.

The invention provides a preparation method of bis-[3-(triethoxysilyl) propyl]-disulfide. The preparation method comprises the following steps: S1, under the protection of nitrogen, dropwise adding chloropropene and trichlorosilane into a non-polar solvent, a first catalyst and tripropylamine, reacting at room temperature, taking filtrate, dropwise adding the filtrate into alcohol in a micro-reflux state, reacting, adding a sodium alkoxide / alcohol solution for neutralizing, filtering, and distilling to obtain allyltriethoxysilane; and S2, under ultraviolet light, mixing allyltriethoxysilane, mercaptopropyltriethoxysilane and benzoin dimethyl ether, reacting at room temperature for 2-3 hours, adding sulfur and a second catalyst, carrying out heating reaction, removing low boiling points, cooling, and filtering. According to the preparation method provided by the invention, bis-[3-(triethoxysilyl) propyl]-disulfide is successfully and effectively synthesized, a phase transfer catalyst does not need to be introduced for catalysis, hydrolysis of silane and treatment of saline water are reduced, the yield of single-kettle synthesis is high, and the utilization rate of equipment is high.

The invention discloses a quantitative detection method for a mixture of bis (2-hydroxyethyl) disulfide and mercaptoethanol, and relates to the field of analysis and detection. The testing method comprises the following steps: respectively preparing a bis (2-ethoxyl) disulfide standard solution and a mercaptoethanol standard solution with different concentrations; and quantitatively measuring the standard solution and the detection sample through gas chromatography equipment, optimizing chromatographic conditions, drawing a standard curve according to the detection result of the standard solution, and quantitatively analyzing the detection sample by combining the standard curve and the spectrum of the standard solution. According to the present invention, the gas chromatography conditions are optimized, the phenyl functional group-containing polysiloxane is selected as the filler of the chromatographic column, and the detection temperature and the temperature rising program are controlled so as to ensure the separation and the detector sensitivity, and the split ratio is controlled to avoid the non-linear response and the peak overlapping; the detection accuracy of the bi-component bis (2-ethoxyl) disulfide and mercaptoethanol is high, the chromatographic peak separation degree is good, and the product quality detection requirement can be met.

The application provides an isomerized eucommia elastomer and a preparation method and application thereof. The isomerized eucommia elastomer forms cis-isoprene structure in the molecular chain through self-isomerization reaction. By regulating the content of cis structure, the regulation of the regularity of the molecular chain is realized, so that the isomerized eucommia rubber no longer crystallizes at room temperature and exhibits high elasticity. Meanwhile, the suitable regularity enables the isomerized eucommia rubber to have self-reinforcing capacity and exhibit excellent mechanical strength. The application also provides a preparation method and application of the isomerized eucommia elastomer. The isomerization modification of the eucommia rubber is carried out by using a mercapto compound or a disulfide compound under the initiation of a free radical initiator. The high-performance isomerized eucommia rubber elastomer material obtained by the application does not change the original chemical structure and polarity of the eucommia rubber, has similar structure and performance to natural rubber, can make up for the problem of insufficient yield of natural rubber, and has wide application prospects in the fields of tires, conveyor belts, sealing rings, wearable devices and the like.

The phenylenediamine-based antioxidant is used as a substitute for 6PPD, while improving scorch resistance and heat aging resistance. [Solution] The rubber composition according to the embodiment comprises a rubber component, a phenylenediamine-based antioxidant represented by the following formula (1), and a thiuram disulfide-based vulcanization accelerator. In formula (1), R 1 and R 2 Each of these independently represents a hydrocarbon group having 6 or more carbon atoms, however, R 1 and R 2 Except when it is a combination of a phenyl group and a 1,3-dimethylbutyl group. [Formula 1] JPEG2026103949000010.jpg42129

The present application relates to a kind of preparation method of extremely thin copper foil with metal-organic disulfide as composite stripping layer, belong to the manufacturing technical field of thin thickness copper foil, the present application uses direct current deposition to prepare metal stripping layer, the interface of carrier copper foil and metal stripping layer is stronger combined, then organic disulfide or organic disulfide salt is adsorbed between metal stripping layer and extremely thin copper foil, form organic stripping layer, obtain the composite stripping layer of surface uniformity, stable performance, effectively reduce the stripping strength of carrier copper foil, extremely thin copper foil is extremely thin and uniform, and the bonding force between composite stripping layer and carrier foil and extremely thin copper foil is different, can make the extremely thin copper foil before and after pressing be easily completely, stably and with carrier foil stripping.

An oral care composition is provided and includes a natural flavor extract, a sulfur source such as dimethyl disulfide, a stannous ion source, and a soluble metal ion source that prevents the formation of methyl mercaptan. The natural flavor extract may contain dimethyl disulfide as an impurity. The soluble metal ion source may include a metal salt, a metal oxide, or a combination thereof, and the soluble metal ion source may include a copper ion source, a silver ion source, a zinc ion source, or combinations thereof.

The invention belongs to the technical field of organic synthesis, and discloses a symmetric disulfide compound containing a sulfoxide group and application of the symmetric disulfide compound in glycosylation reaction, and the structural general formula of the compound is as shown in formula (I). According to the present invention, the compound represented by the structural general formula (I) contains sulfoxide and disulfide structures, and the sulfinyl forming the sulfoxide and the disulfide bond-containing group are located at the ortho-position of the aromatic ring, such that the compound can be used as the activation reagent for the glycosylation reaction, and particularly, activation of the glycosyl donor and glycosylation reaction can be efficiently promoted by only using 0.25 times of equivalent weight of the glycosyl donor, so that the use of a highly toxic, expensive, unstable or metal-containing activating reagent is avoided, and the problems that the activating reagent of the thioglycoside donor in the existing glycosylation reaction is unstable, is not easy to prepare and often needs equivalent weight or excessive amount are solved.

This invention discloses a method for preparing high-purity Si-75, comprising: S1, adding sodium sulfide, sulfur, and deionized water in a molar ratio of 1:(1.0~1.1):(5~8) to a reaction vessel, adding a buffer, and reacting at 80~90℃ for 1~2h; S2, adding a phase transfer catalyst and a hydrolysis inhibitor to the system, adding γ-chloropropyltriethoxysilane dropwise, and reacting at 85~95℃ for 3~5h, allowing the mixture to stand and separate into layers after the reaction, to obtain an organic phase; S3, subjecting the organic phase to short-path distillation and then filtering to obtain high-purity Si-75. Compared with existing technologies, this invention uses a phosphorus-free buffer system, which simplifies waste treatment. It uses water as the reaction medium and does not use large amounts of organic solvents, making it suitable for continuous industrial production. By adding hydrolysis inhibitors, hydrolysis can be effectively prevented during the reaction, increasing safety. The short-path distillation method provides high purification efficiency and can quickly remove impurities. The product has a disulfide content of ≥98.5% and a color of 0 (Gardner color number), which is of great significance to the light-colored rubber industry.

A method of reprocessing a polymer includes melt-processing molten polyolefin and an ensemble of crosslinker molecules dispersed in the molten polyolefin, each crosslinker molecule of the ensemble having a —Sn— moiety and having at least two polymerizable groups, where n is an integer of from 1 to 8, the melt-processing being carried out in the presence of a free radical generator, to produce a reversibly-crosslinked polymer network comprising crosslinker bonds derived from crosslinker molecules of the ensemble that are incorporated into the polymer network via said melt-processing, where crosslinker bonds are dissociable when the reversibly-crosslinked polymer network is reprocessed at temperatures of 50° C. or greater, and where, for at least 90% of the crosslinkers molecules in the ensemble, n is equal to 2.

The present disclosure provides a process. In an embodiment, the process includes providing a crosslinkable polymer composition. The crosslinkable polymer composition includes (i) a (polar) ethylene-based polymer having a melt temperature, Tm, (ii) a free radical initiator having a decomposition temperature, Tdecomp, (iii) 2,2,6,6-tetramethyl-4-piperidyl methacrylate disulfide (BiTEMPS methacrylate), and optional additives. The process includes mixing, in a mixing device, the crosslinkable polymer composition at a temperature greater than or equal to the decomposition temperature of the peroxide, and forming a BiTEMPS methacrylate grafted (polar) ethylene-based polymer (BIT-g-pPE).

This disclosure provides a vulcanized rubber with self-healing and recyclable properties, its preparation method, and its applications, belonging to the field of rubber materials technology. The vulcanized rubber provided in this disclosure has the following weight proportions: 100 parts rubber, 1-10 parts a copolymer obtained by copolymerization of sulfur and a sulfur-containing disulfide in the presence of a first catalyst, 1-3 parts a second catalyst, 1-3 parts zinc oxide, 1-2 parts an antioxidant, and 10-50 parts carbon black. This disclosure achieves the self-healing and recyclable functions of the vulcanized rubber. The vulcanized rubber material prepared by this disclosure is simple and readily available, which is beneficial for extending the shelf life of rubber products and protecting the environment.

The present invention relates to the use of a trivalent chrome plating bath composition for the electrodeposition of a hard chrome layer with a thickness of 1 µm or more, the composition comprising (A) trivalent chromium ions in an amount of 5-40 g / l, (B) at least one anion selected from sulfate, chloride, bromide and methanesulfonate, (C) at least one carboxylate ion selected from formate and acetate, (D) at least one buffer substance selected from ammonia, boric acid, carboxylic acids with 2 to 8 carbon atoms other than component (C) and salts thereof, and aluminium salts, and (E) 0.01 to 100 g / l of at least one specific compound which comprises a sulfonate group and a sulfide or disulfide group. Other aspects of the invention relate to a hard chrome plating process, a hard chrome plating layer and a hard chrome plated article.

The invention discloses an amphiphilic disulfide and a preparation method and application thereof, and belongs to the technical field of emulsion polymerization, the disulfide has the following structural general formula (I), in the formula (I), R1 is C1-C6 straight chain or branched chain alkyl; r2 is C2-C6 straight chain or branched chain alkyl; M1 is alkali metal ion or NH4 < + >; and M2 is alkali metal ion. A redox system formed by the disulfide and an oxidizing agent is used for post-treatment of a polymerized emulsion, residual monomers and free radicals in the emulsion can be efficiently cleared in a targeted mode, excellent emulsion stability is kept, and formaldehyde is not released.

The present application relates to the technical field of medicine, in particular to a kind of siRNA eye drop for penetrating mucus barrier and cell barrier and preparation method thereof.Innovative development side chain guanidino group-containing polydisulfide delivery carrier is used in the present application, through the quick dynamic disulfide exchange reaction between polydisulfide and sulfhydryl on mucin, tear film retention and efficient penetration are realized, and cationic polydisulfide is quickly adsorbed on the surface of negative charged cell membrane by electrostatic interaction, the quick dynamic disulfide exchange reaction between polydisulfide and sulfhydryl on cell membrane is used, and endocytosis is used to quickly penetrate tight junction cell layer.

The disclosure relates to solid and liquid compositions for reducing lactation, improving health, reducing the risk and or occurrence of intramammary infections, dry-off related stress, dry-off related inflammation, and / or dry-off related infections. A preferred compound is di-n-propyl disulfide.

This invention discloses a method for synthesizing disulfide ether compounds using visible light-emitting two-dimensional olefin nanomaterials in synergistic catalysis. The method involves mixing a thiol-containing compound with a suitable solvent, and then, under mild light conditions in the presence of a catalytic amount of two-dimensional olefin nanomaterials, achieving efficient disulfide bond construction to obtain a series of disulfide ether compounds. This invention enables the efficient synthesis of disulfide ether compounds. The catalyst used is simple to synthesize, requires low dosage, and is inexpensive. It achieves efficient conversion under mild light conditions, reducing reaction costs and simplifying post-processing steps. The synthesis reaction in this invention can be carried out at room temperature and pressure without any additional additives, exhibiting mild conditions, rapid reaction, and high yield.

The invention relates to a C4 hydrocarbon fraction fine desulfurization method and a reaction device. The C4 hydrocarbon fraction fine desulfurization method comprises the following steps: (1) mixing an oxidant with naphtha to obtain oxidant carrying oil; (2) mixing the C4 hydrocarbon fraction with the oxidant carrying oil, then adding a mercaptan conversion auxiliary agent, entering an oxidation reactor to be in contact with an oxidation catalyst to carry out oxidation reaction, and converting mercaptan into disulfide; and (3) carrying out rectification separation on the material flow after the oxidation reaction to obtain a fine desulfurized C4 hydrocarbon fraction and sulfur-containing naphtha. According to the method provided by the invention, the safety of the C4 hydrocarbon fraction oxygen dissolving process is improved by virtue of the oxidant carrying oil, the boiling point difference between sulfide and C4 hydrocarbons is increased by virtue of the mercaptan oxidation reaction, the fine desulfurized C4 hydrocarbon fraction with the total sulfur content not greater than 1mg / kg is obtained by adopting a rectification method, and a high-quality raw material can be provided for chemical utilization of the C4 hydrocarbon fraction.

The invention discloses a preparation method and application of a sulfur-doped carbon-coated silicon-carbon negative electrode material, and belongs to the technical field of battery materials. The preparation method comprises the following steps: (1) carrying out ball milling on micron silicon, zirconium beads, ethanol and an etching agent; (2) dissolving a lignin derivative and disulfide in a solvent to prepare a dispersed mixed solution; (3) carrying out ball milling on the nano silicon slurry and the dispersed mixed solution; washing the product with absolute ethyl alcohol, and dissolving in a solvent; and (4) carrying out spray drying on the obtained product, then adding asphalt, and carrying out carbonization in an inert atmosphere. The sulfur-containing doped carbon coating layer silicon-carbon negative electrode material prepared by the invention has good toughness and strength, and when volume expansion of silicon occurs in a charging and discharging process, the carbon layer is not easy to separate from a silicon core, and volume change can be more effectively restrained and buffered, so that the integrity of an electrode structure is maintained, and the cycle life is remarkably prolonged.

The present invention is directed to a method of selectively reacting and removing disulfides and reducing corrosivity in petroleum matrixes with an acid wash composition.

The application discloses a kind of ultrafast metal-free and solvent-free preparation method for preparing symmetric and asymmetric disulfide, which comprises the following steps: at room temperature, raw material R-SH, R'-SH and oxidant and base are added to reaction bottle, shake rapidly for 10-30 seconds, and R-S-S-R' is prepared after the reaction product is purified;Wherein R in R-SH is aliphatic or aromatic group, R' in R'-SH is aliphatic or aromatic group;R in R-SH and R' in R'-SH are same or different;The aromatic group has substituent or no substituent, and the aliphatic is straight chain or has branch;The oxidant is chloroform, and the base is N, N-diisopropylethylamine (DIPEA).The method is simple in operation, high in yield (60-99%), ultrafast in reaction kinetics, greatly improves production efficiency, wide in applicability, avoids the use of organic reaction solvent, raw material is cheap and easy to obtain, and does not contain residual metal and other sticky contaminants from reagent and ligand, provides a safer and more effective method for the synthesis and production of symmetric and asymmetric disulfide-containing compounds.

The invention belongs to the technical field of chemical synthesis, and discloses an asymmetric disulfide compound containing a sulfoxide group as well as a preparation method and application thereof, and the asymmetric disulfide compound containing the sulfoxide group has a structure as shown in a structural general formula (I). By improving the structure of the compound and the preparation method thereof, the obtained compound as shown in the structural general formula (I) is novel in structure and stable in property; the preparation method has the advantages of cheap and easily available raw materials, simple operation, high reaction yield, convenient separation and purification of intermediates and products, suitableness for industrial production, and high preparation efficiency. Moreover, the compound as shown in the structural general formula (I) can be particularly used as an activating reagent to be applied to glycosylation reaction, is simple and convenient to operate and high in reaction activity when being used for glycosylation reaction, and can be widely applied to activation of thioglycoside and selenoglycoside to construct various substrates such as oxygen glycoside, phenolic glycoside, ester glycoside, nucleoside and carbon glycoside.

The disclosure relates to organosulfur compounds and compositions comprising same. In particular, the disclosure relates to Bis(4-fluorophenyl) disulfide, Bis(4-chlorophenyl) disulfide, Bis(4-chlorophenyl) thiosulfinate, Bis(4-fluorophenyl) thiosulfinate, Bis(4-chlorophenyl) thiosulfonate, Bis(4-fluorophenyl) thiosulfonate, and Di-isopropyl thiosulfonate. Such compositions are useful for treating microbial infection, in particular bacterial, fungal, rotozoan or algal infection. Compositions comprising said compounds are also provided for cleaning, disinfecting or agricultural use.

The invention provides a disulfide compound of formula (I) as defined in the claims for use as a medicament, including its use as an antimicrobial agent, such as an antibacterial agent; and its use in the treatment of cancer. The invention also provides a pharmaceutical composition per se comprising a disulfide compound of formula (I) and one or more other antibiotics, in particular aminoglycoside antibiotics, including the compound fradiomycin, as well as the use of said pharmaceutical composition as a medicament, including its use as an antimicrobial agent.

The invention relates to a novel process for synthesizing bis-((triethoxysilyl) propyl)-disulfide in a water phase, which comprises the following steps: (1) adding deionized water, anhydrous sodium sulfide hydrate and powdered sulfur into a reaction container, and stirring for reaction; (2) respectively weighing 3-chloropropyltriethoxysilane and a deep eutectic solvent, and stirring the 3-chloropropyltriethoxysilane and the deep eutectic solvent to prepare a mixed solution; (3) adding the mixed solution into a four-mouth reaction container through a constant-pressure dropping funnel, and monitoring the reaction process through gas chromatography; and (4) after the reaction is completed, cooling to room temperature, standing for layering, and treating an organic phase to obtain a product. The bis-((triethoxysilyl) propyl)-disulfide is prepared by adopting an aqueous phase synthesis method, water is taken as a solvent, and a deep eutectic solvent is adopted to replace a conventional phase transfer catalyst, so that migration and contact of reactants between two phases can be promoted, and the yield of the reaction products is increased; and the problems of residual risk and environmental pollution possibly caused by a traditional phase transfer catalyst are effectively avoided.

The invention relates to cationic cyclic oligomeric disulfide as well as a synthesis method and antimicrobial application thereof, and belongs to the technical field of chemical synthesis. The synthesis method provided by the invention comprises the following steps: carrying out primary reaction on a monomer M and an acid solution in a solvent to obtain an intermediate M '; pKa of acid in the acid solution is less than 3, and the monomer M conforms to a specific general formula (I); and S2, adjusting the system to enable the concentration of the acid to be greater than or equal to 0.25 mol / L, carrying out secondary reaction at 25-65 DEG C to obtain a reaction solution, and then carrying out drop precipitation and separation to obtain the cationic cyclic oligomeric disulfide. According to the synthesis method provided by the invention, the cationic cyclic oligomeric disulfide can be selectively obtained, and the product does not contain high-molecular-weight linear high-molecular-weight polydisulfide, so that the yield is high, the oligomer conversion rate is high, and the method is suitable for industrial production. Diversified modification of cation types is beneficial to further research, development and preparation of broad-spectrum antimicrobial agents capable of resisting fungi and mixed bacterial infection.