22 results about "Sulfenamide" patented technology

This invention discloses an analytical method for benzothiazole contaminants, comprising the following steps: detection by high performance liquid chromatography (HPLC), with the following chromatographic conditions: a phenylhexyl column as the stationary phase, mobile phase A being water, mobile phase B being acetonitrile, and gradient elution; wherein the benzothiazole contaminants are at least one of 2-aminobenzothiazole, 2-hydroxybenzothiazole, benzothiazole, 2-methylbenzothiazole, 2-mercaptobenzothiazole, 2,5-dimethylbenzothiazole, 2-cyanobenzothiazole, ethyl 2-carboxylate benzothiazole, 2-chlorobenzothiazole, 2-bromobenzothiazole, 2-methylthiobenzothiazole, phenylthiocyanate, N-tert-butyl-2-benzothiazole sulfenamide, 2-(2-hydroxyphenyl)-benzothiazole, N-cyclohexyl-2-benzothiazole sulfinamide, dibenzothiazole disulfide, and N,N-dicyclohexyl-2-benzothiazole sulfonamide.

The invention relates to the technical field of rubber, in particular to an off-road tire base rubber composition. Based on 100 parts by weight of natural rubber components, the natural rubber composition further comprises the following components in parts by weight: 20-40 parts of carbon black, 5-15 parts of silicon dioxide hydrate, 5-20 parts of nano zinc oxide, 1-3 parts of stearic acid, 1-3 parts of p-phenylenediamine, 1-3 parts of a ketoamine anti-aging agent, 1-3 parts of bis (triethoxysilyl) propyl tetrasulfide, 1-5 parts of carbon nanotubes CNT, 1-4 parts of N, N '-m-phenylene bismaleimide, 0.5-2 parts of sulfur and 0.5-2 parts of a sulfenamide accelerant. The modulus of the rubber material is improved by adding the CNT, so that the consumption of carbon black is reduced, and heat generation is reduced; by adding nano zinc oxide and carbon nanotubes, the heat conductivity of the rubber material is improved; and by adding the N, N '-m-phenylene bismaleimide, the heat resistance of the rubber material is improved.

The invention relates to the technical field of polymer foam materials, in particular to a rubber-based composite foam material for a middle layer of a shoe sole and a preparation method of the rubber-based composite foam material for the middle layer of the shoe sole. Adding a foaming agent, sulfur, an accelerant N-cyclohexyl-2-benzothiazole sulfenamide and tetrabenzylthiuram disulfide, and carrying out secondary internal mixing to obtain a uniformly mixed styrene butadiene rubber / natural rubber-based rubber compound; putting the rubber compound into an open mill, and discharging bubbles; and finally, carrying out high-temperature curing foaming on the rolled rubber compound by using a plate vulcanizer. The rubber-based composite foam material obtained by the invention has the characteristics of simple process, light weight, uniform foam holes, high elasticity and high tensile strength, and is suitable for middle-layer materials of soles.

The present invention addresses the problem of providing a rubber composition having improved heat resistance while suppressing blooming and ensuring tackiness. The means for solving the problem is a rubber composition containing a rubber component, two or more sulfenamide-based vulcanization accelerators, and one or more thiuram-based vulcanization accelerators, wherein the content of each of the two or more sulfenamide-based vulcanization accelerators is 3.7 parts by mass or less per 100 parts by mass of the rubber component, and the total content of the two or more sulfenamide-based vulcanization accelerators is 4 parts by mass or more per 100 parts by mass of the rubber component.

The invention belongs to the field of rubber materials, and particularly relates to a durable high-resilience rubber composite material and a preparation method thereof. The rubber composite material provided by the invention is prepared from the following raw materials: natural rubber, high trans-1, 4-butadiene-isoprene copolymer rubber, high butadiene rubber, epoxy natural rubber grafted lignosulfonate, tetrapod-like zinc oxide whiskers, nano spherical zinc oxide, stearic acid, an anti-aging agent, a flame retardant, a vulcanizing agent, a first accelerant and a second accelerant. The first accelerant is selected from sulfoxide diethyldithiocarbamate, sulfoxide dibenzyl dithiocarbamate, sulfone dithiocarbamate and sulfone dibenzyl dithiocarbamate, and the second accelerant is selected from sulfoxide diethyldithiocarbamate, sulfoxide dibenzyl dithiocarbamate, sulfone dithiocarbamate and sulfone dibenzyl dithiocarbamate; the second accelerant is 4, 4 '-dithio-dimorpholine, 2-morpholinyl dithio-benzothiazole, N-oxydiethylene-2-benzothiazole sulfenamide, and dibenzoyl morpholine. The invention further discloses a preparation method of the flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame-retardant flame retardant. The rubber composite material provided by the invention has excellent high resilience and use durability.

The object of this invention is to provide a rubber composition that suppresses bloom and maintains tack while improving heat resistance. [Solution] A rubber composition comprising a rubber component, two or more sulfenamide-based vulcanization accelerators, and one or more thiram-based vulcanization accelerators, wherein the content of each of the two or more sulfenamide-based vulcanization accelerators is 3.7 parts by mass or less per 100 parts by mass of the rubber component, and the total content of the two or more sulfenamide-based vulcanization accelerators is 4 parts by mass or more per 100 parts by mass of the rubber component.

The present invention relates to the field of high polymer material processing, and discloses a rubber in-mold foaming lightweight sports shoe material and a preparation method thereof, the rubber in-mold foaming lightweight sports shoe material comprises the following raw material components by weight: 60-100 parts of a rubber base material, the rubber base material comprises butadiene rubber, styrene butadiene rubber and at least one special synthetic rubber; 30 to 40 parts of a reinforcing filler; 3-8 parts of a vulcanization system comprising sulfur and a sulfenamide accelerator; 5-12 parts of a composite foaming system which comprises an organic foaming agent, a foaming promoter and a nucleating agent; and 3-8 parts of an activation system comprising zinc oxide and fatty acid. A traditional multi-section type processing flow is replaced by an in-mold one-step foaming forming process, and plastifying, foaming, vulcanizing and shaping of a rubber compound are integrated and completed in a single mold procedure through sectional temperature control, pressure coupling regulation and a foaming-vulcanizing rate matching technology, so that the production period is greatly shortened, the energy consumption and equipment occupation are reduced, and the production cost is reduced. Meanwhile, a uniform and fine closed pore structure is formed by utilizing accurate foaming window control and nucleating agent induction effect.

The invention discloses anti-cutting low-heat engineering tire tread rubber based on a composite reinforcing system and a preparation method thereof, and relates to the technical field of tread rubber. According to the technical scheme, the rubber material is prepared from the following components in parts by weight: 0 to 40 parts of natural rubber, 60 to 100 parts of tear-resistant modified rubber NRX-N1, 10 to 20 parts of HT carbon silicon enhancer, 40 to 50 parts of carbon black, 3 to 5 parts of zinc oxide, 1 to 2 parts of stearic acid, 2 to 4 parts of anti-aging agent, 1 to 2 parts of microcrystalline wax, 1.5 to 2.5 parts of sulfur, 0.5 to 1 part of accelerant 833 and 0.5 to 1.5 parts of sulfenamide accelerant. According to the invention, the tear-resistant modified glue NRX-N1, the HT carbon silicon reinforcing agent and the specific alkaline accelerant 833 are innovatively and synergistically compounded, a unique'fiber reinforcement-nano reinforcement-vulcanization network optimization 'composite system is constructed, and a remarkable breakthrough in performance is realized.

The invention discloses a rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine as well as a preparation method and application of the rubber accelerator 3-methylpiperidinyl dithio sulfenamide piperazine. The method comprises the following steps: dissolving anhydrous piperazine in absolute ethyl alcohol under a stirring condition, adding an aqueous solution containing sodium hydroxide, stirring at room temperature, cooling, adding carbon disulfide stored in absolute ethyl alcohol, stirring, adding a proper amount of 4-methylpiperidine into the system, standing, dropwise adding iodine and potassium iodide which are dissolved in deionized water, continuing to react after the addition is completed, filtering, washing, and drying to obtain the 4-methylpiperidine. And filtering with deionized water, drying and crushing. The accelerator 3-methylpiperidyl dithiosulfenamide piperazine prepared by the invention has the characteristics of high vulcanization rate of a dithiocarbamate accelerator and moderate scorch period of a sulfenamide accelerator, and can solve the problem of rapid vulcanization of ethylene propylene diene monomer.

Provided is a tire including a reinforcement layer (6a), (6b) composed of a reinforcing material and vulcanized rubber covering the reinforcing material, in which: the vulcanized rubber is composed of a rubber composition including N-cyclohexyl-2-benzothiazyl sulfenamide; the reinforcing material includes a steel cord surface coated with a ternary plating layer of copper, zinc, and iron; the reinforcement layer (6a), (6b) is disposed radially inside a tread surface of the tire; and a ratio (a / b) of a modulus (a) at an elongation of 50% of the vulcanized rubber covering the reinforcing material in a tire width direction central portion (6C) of the reinforcement layer (6a), (6b) to a modulus (b) at an elongation of 50% of the vulcanized rubber covering the reinforcing material in tire width direction end portions (6E) of the reinforcement layer (6a), (6b) is 0.94 to 1.06. The tire has a high modulus and excellent productivity.

The application discloses a preparation method of a chiral sulfimine compound and belongs to the technical fields of visible light catalysis and organic synthesis. N -[(9 R )-6'-methoxyoctanosyl]-8-quinolinesulfonamide as a chiral ligand, fluorobenzene as a solvent, under the action of a copper salt and an oxidant, under visible light irradiation at room temperature in a protective atmosphere, the copper salt, the sulfenamide compound and N -[(9 R )-6'-methoxyoctanosyl]-8-quinolinesulfonamide form a copper complex, the copper complex enters an excited state under visible light irradiation, cleaves the oxidant through an energy transfer or single electron transfer process, generates a highly active free radical, the free radical activates an inert carbon-hydrogen bond to generate an alkyl free radical and reacts with the sulfenamide in the copper complex, asymmetric sulfuration of the inert carbon-hydrogen bond is realized, and the chiral sulfimine compound is obtained.

The invention discloses a PMMA (polymethyl methacrylate) migration prevention rubber material which is prepared by mixing ethylene propylene diene monomer, zinc oxide, zinc stearate, carbon black, calcium carbonate, paraffin oil, polyethylene glycol, sulfur, benzothiazyl disulfide and N-cyclohexyl-2-benzothiazole sulfenamide. The rubber material has good physical and mechanical properties such as material strength, tensile strength, elongation and tearing strength; the invention also discloses a preparation method of the PMMA migration prevention rubber material. The rubber material prepared by the method has good physical and mechanical properties.

The application discloses a method for constructing S-N bond by electrochemical oxidation of glycosyl mercaptan and amine compound to synthesize glycosyl sulfenamide, and belongs to the technical field of drug intermediate synthesis. The method uses an organic solution containing glycosyl mercaptan, amine compound and electrolyte salt as an electrolyte, places an anode and a cathode in the electrolyte, passes direct current, and performs electrochemical reaction to obtain a glycosyl sulfenamide compound. The method has strong reaction universality, high yield of target product, and is realized by one-step chemical reaction, and has mild reaction conditions and does not need any transition metal catalyst.

The invention relates to the technical field of organic synthesis chemistry and asymmetric catalysis, in particular to an amino acid-derived N, N, N-tridentate ligand and a preparation method and application thereof.The ligand has the structure shown in the general formula (I) or comprises an acyl / sulfonyl unit part and an amino acid-derived diamine unit, wherein R1 is selected from substituted or unsubstituted aryl, heteroaryl, alkyl or styryl, and the diamine unit is derived from natural or artificial amino acid. The ligand is wide in source, simple and convenient to synthesize, diverse in structure, low in price and easy to obtain, can be coordinated with a copper catalyst to be used for catalyzing S-functionalization and other asymmetric free radical reactions of sulfenamide, shows excellent catalytic activity and enantioselectivity, has the yield of 80% or above and the enantiomeric excess (ee) value of 90% or above, and is suitable for industrial production. The quinine alkaloid ligand overcomes the defects of single structure, high price and difficulty in modification of the existing quinine alkaloid ligand.

The invention relates to the technical field of rubber, in particular to high-cushioning regenerated mixed rubber and a preparation method thereof.The high-cushioning regenerated mixed rubber is prepared from, by mass, 10-16 parts of regenerated rubber, 5-10 parts of butadiene-styrene rubber, 8-13 parts of argil, 15-20 parts of carbon black, 1.5-3.5 parts of naphthenic oil, 0.1-0.5 part of stearic acid, 0.5-1 part of paraffin, 1.5-3.5 parts of rubber additives and 4-8 parts of natural rubber; the regenerated mixed rubber also comprises a trace additive, the trace additive is a combination of N-cyclohexylthiophthalimide and N-cyclohexyl-2-benzothiazole sulfenamide, and the total content of the trace additive is 800 to 3200 ppm; according to the invention, a plurality of trace additives such as N-cyclohexylthiophthalimide and N-cyclohexyl-2-benzothiazole sulfenamide are added into the mixed reclaimed rubber, so that the breaking strength of the vulcanized rubber material is greatly improved under the condition that the hardness and the tensile length are ensured; meanwhile, the material has good mechanical properties and thermal stability in severe environments such as moisture and exposure to the sun.

This invention belongs to the field of catalyst and rubber additive synthesis, specifically relating to a method for preparing a polymetallic oxygen cluster electrocatalyst for the electrochemical synthesis of N-tert-butyl-2-benzothiazole sulfenamide. This invention utilizes (TBA)₄H₃[PW 10 Cu2O 38 Using (H2O) foam material as an electrocatalyst, the synthesis method of N-tert-butyl-2-benzothiazole sulfenamide has been expanded through a simple, economical, recyclable, and environmentally friendly one-pot electrocatalytic process (room temperature and atmospheric pressure), laying the foundation for its application in rubber additives.

The invention discloses a preparation method of rubber for a low-density closed-cell foaming automobile sealing strip, and relates to the technical field of rubber preparation. Comprising the following raw materials: ethylene propylene diene monomer, zinc oxide, an activating auxiliary agent, carbon black N550, nano hydrotalcite, maleic anhydride grafted ethylene propylene diene monomer, modified hydrogenated polybutadiene oil, azodicarbonamide, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, triallyl isocyanurate, an antioxidant, modified zinc stearate and modified zinc borate. According to the invention, the modified zinc stearate is added, azodicarbonamide can be efficiently activated at low temperature, foaming is more sufficient and uniform so as to reduce the rubber density, the nano rigid shell can enhance the supporting force of the cell wall to avoid collapse and deformation, and the alkyl phosphoimide can improve the dispersion uniformity of the nano rigid shell in the non-polar ethylene propylene diene monomer; and meanwhile, stronger combination with a rubber matrix is formed, so that the foaming fineness is optimized, agglomeration and blooming are reduced, and the rubber is assisted to form a stable and uniform closed-cell structure.

This invention discloses a high-performance rubber material for self-balancing scooter wheels, its preparation method, and the scooter wheel itself. The rubber material comprises a blend of two EPDM rubbers with specific ethylene content and Mooney viscosity, a composite reinforcing system composed of carbon black N550 and silica VN3, and a silane coupling agent for surface modification of the silica. It also employs a composite vulcanization system containing thiazole, sulfenamide, dithiocarbamate, thiuram, and sulfur carrier accelerators. Through the synergistic effect of the components, this invention achieves a rubber material with a tensile strength ≥18 MPa and elongation at break ≥300% at a hardness of 65±5 Shore A, while maintaining a compression set (70℃×24h) ≤18% and Akron abrasion volume ≤0.38 cm³, demonstrating significantly superior overall performance compared to existing technologies. This invention also relates to a preparation method for the rubber material, which further optimizes the dispersion effect of silica and the heat aging resistance of the vulcanized rubber through a two-stage mixing process and a silane coupling agent pretreatment. This invention is suitable for applications such as high-performance self-balancing scooter wheels.

The invention discloses a green synthesis method of an accelerator N, N-dicyclohexyl-2-benzothiazole sulfenamide, which comprises the following steps: reacting dibenzothiazyl disulfide (MBTS) as a sulfur source with dicyclohexylamine in a solvent in the presence of iodine / iodide ions (I / I <->) in an air or oxygen atmosphere under a weakly alkaline condition to generate DCBS (N, N-dicyclohexyl-2-benzothiazole sulfenamide). Compared with an existing oxidation system, the method has the advantages that the process is simplified, salt load and waste liquid are remarkably reduced, operation safety is improved, product purity is high, yield is stable, and the method is suitable for large-scale industrial production.

The application discloses an ionic carbon nitride photocatalyst, a preparation method thereof and a method for photocatalytically synthesizing a sulfenamide compound. The catalyst takes carbon nitride as a base, and carbon and metal cations are doped in the carbon nitride. (1) A carbon nitride precursor, a metal chloride and 2,4,6-triaminopyrimidine are mixed and ground, dried, and subjected to first high-temperature calcination at 500-600 DEG C for 3-5 hours, and then washed, dried and obtained as an intermediate product; (2) the intermediate product and potassium thiocyanate are mixed and ground, and subjected to second high-temperature calcination at 500-520 DEG C for 0.5-1.5 hours under an inert atmosphere, and then washed, dried and obtained as the ionic carbon nitride photocatalyst. A mercapto compound, an amine compound, the ionic carbon nitride photocatalyst and acetonitrile are subjected to photoreaction in an oxygen or air environment at 0.1-0.3 MPa and at 0-40 DEG C for 5-24 hours, and a sulfenamide compound is obtained. The ionic carbon nitride photocatalyst prepared by the application has a wide range of substrates and does not need to use an alkali assistant in the process of synthesizing the sulfenamide compound.

The synthesis method comprises the following steps: taking a sulfenamide compound (I) as a starting raw material, reacting with an amination reagent (IV) under the action of a catalyst (II) and an additive (III), and obtaining a target product, i.e., the sulfur imine amide compound (V) at room temperature. The method disclosed by the invention is mild in reaction condition, simple and convenient to operate, relatively low in cost, high in yield and enantioselectivity, environment-friendly and beneficial to industrial production, and solves the problem that thioimine amide compounds with diversified structures are difficult to synthesize.

The invention relates to a method for preparing chiral thioimine by catalytic asymmetric alkylation starting from an inert C-H bond, and the method comprises the following step: reacting sulfenamide as shown in a formula (S) and a compound as shown in a formula (C) in the presence of a catalyst, alkali and a ligand to prepare the chiral thioimine as shown in a formula (I). According to the method, first-stage, second-stage and third-stage unactivated alkanes and various alpha-functionalized alkanes can be converted into alkyl free radicals, then the alkyl free radicals and N-acyl sulfonamide are subjected to asymmetric coupling, and a series of chiral alkyl thioimides with high enantioselectivity are efficiently constructed.