38 results about "Para phenylenediamine" patented technology

A lubricant composition is disclosed that comprises lubricating oil and a mixture of at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine. Also disclosed is a method of increasing the oxidation stability of a lubricating oil comprising adding thereto at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine.

Rubber composition which can be used in particular for the manufacture of tires, comprising at least a diene elastomer, a reinforcing filler, a crosslinking system, between 0.2 and 10 phr of an antioxidant, such as a substituted para-phenylenediamine, and between 0.2 and 10 phr of an acetylacetonate of an alkali metal or alkaline earth metal, chosen in particular from the group consisting of Li, Na, K, Mg, Ca and the mixtures of such metals. This acetylacetonate compound makes it possible to advantageously reduce the consumption of antioxidant during the thermo-oxidizing ageing of the composition. Metal / rubber composite comprising such a composition and at least a metal reinforcement. Tire comprising a such composition or such a composite.

Rubber composition which can be used in particular for the manufacture of s, comprising at least a diene elastomer, a reinforcing filler, a crosslinking system, between 0.2 and 10 phr of an antioxidant, such as a substituted para-phenylenediamine, and between 0.2 and 10 phr of chromium (III) acetylacetonate. This acetylacetonate compound makes it possible to advantageously reduce the consumption of antioxidant during the thermo-oxidizing ageing of the composition. Metal / rubber composite comprising such a composition and at least a metal reinforcing member. comprising such a composition or such a composite.

The present invention relates to yarns comprising copolymers derived from the copolymerization of p-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyl dichloride, wherein The ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to moles of p-phenylenediamine is from 30 / 70 to 85 / 15. The yarn has a sulfur content of greater than 0.1%; and has an effective polymer cation to sulfur content molar ratio of at least 0.3. Additional aspects of the invention relate to methods of making such yarns.

The present invention is applicable to the technical field of phenylenediamine preparation, and provides a preparation method for continuous catalytic hydrogenation of dinitrobenzene for the preparation of phenylenediamine, which uses a phenylenediamine preparation device to realize the preparation of phenylenediamine. The phenylenediamine preparation device includes a preparation assembly, a recovery assembly and a purification assembly, the preparation assembly includes a hydrogenation reactor, a maturation tank, a multistage settling tank and a rectification tower, and the recovery assembly includes a recovery box, a reflux pipe, a feed Bucket, first filter screen, second filter screen, air pump, leaking liquid funnel, liquid outlet valve, return pump, controller, timer, inlet pipe and air valve, the purification assembly includes purification box, communication pipe, shunt pipe , exhaust pipe, air hole, by setting the recovery box for recovering the catalyst, also being provided with an air pump for drying the catalyst and a purification box for purifying the gas extracted by the air pump, the present invention has the advantages of high catalyst recovery efficiency and environmental protection The characteristics of little pollution.

The invention provides a high-performance silicone / fluoroether composite rubber glove. The silicone / fluoroether composite rubber is prepared from the following components in parts by weight: 80 to 120 parts of fluoroether rubber, 40 to 60 parts of methyl vinyl silicone rubber, 1 to 3 parts of a peroxidation vulcanizing agent, 5 to 8 parts of zinc oxide, 15 to 30 parts of phenolic resin, 0.5 to 1.5 parts of an accelerant, 0.1 to 0.5 part of an antioxidant, 15 to 30 parts of hydroxyethyl methylacrylate modified graphene, 3 to 6 parts of dioctyl phthalate, 0.8 to 1.6 parts of B-naphthyl para-phenylenediamine and 50 to 100 parts of tetrahydrofuran. The fluoroether rubber and the silicone rubber are blended and the advantages of the fluoroether rubber and the silicone rubber are completely combined, so the prepared material has excellent high-temperature resistance, corrosion resistance, oil resistance and extremely excellent mechanical property, can be applied to the industrial extreme environment, and creates conditions for application of the future industry.

The present invention provides a method for increasing the sensitivity of LFIAs by using palladium nanoparticles, selecting appropriate dye chemistries, and improving the timing of the development chemistry. In the presence of a palladium nanoparticle, three reagents interact with a catalytic label to form a colored dye. The three reagents include a hydrogen peroxide source, a color developer (a substituted para-phenylenediamine), and a color coupler (e.g. a napthol or a phenol). The timing of the development chemistry is improved by any combination of using a reducing agent, delaying hydrogen peroxide application by diffusion, using dissolving materials as a time delay, using serpentine flow, and separating the color coupler and the color developer on the strip.

The invention relates to a benzimidazole benzaldehyde p-phenylenediamine bis-Schiff base and a preparation method thereof. First, benzimidazole and its derivatives and p-fluorobenzaldehyde are used as raw materials to prepare 4-benzimidazolyl benzaldehyde or benzimidazole derivative benzaldehyde, and then utilize it and p-phenylenediamine through the formation of aldehyde group and primary amine Condensation reactions yielded a series of bis-Schiff bases with larger conjugated structures. The process has low synthesis cost, high yield, easy control of reaction conditions and simple product purification. The novel compound of the invention has good fluorescence performance and is selective to metal ions, and can be applied in the field of materials or sensors.

The present invention relates to a copolymer crumb derived from the copolymerization of p-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyl dichloride, said copolymer crumb The granules have an intrinsic viscosity of at least 3 dl / g with a titratable acid of less than 0.4 mol / Kg. Furthermore, the present invention also relates to filaments and yarns formed from such polymer crumbs and methods for forming said filaments and yarns.

The present invention concerns processes for reducing water in never-dried fiber comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride, the process having the following steps in a continuous process, (a) a step of drying a never-dried fiber having at least 0.1% sulfur at less than 150° C. until the moisture content of the fiber is less than 60 weight percent; and (b) a step of further drying the fiber above 150° C. while the moisture content of the fiber is no more than 60 weight percent; and the fiber being further heated to at least 350° C. in either an additional continuous or separate step.