38 results about "Para phenylenediamine" patented technology

The present invention discloses a production method for a formable polyimide film. The method comprises resin synthesizing, defoaming, slobbering and film forming, and winding and splitting. The resin synthesizing treatment comprises: pressing 4,4'-dimethyl acetamide into an amine dissolving kettle; adding a calculated mixture comprising 4,4'-diaminodiphenyl ether, para-phenylenediamine and 4,4'-diamino-diphenyl-methane to the amine dissolving kettle, stirring for 1 hour until the mixture is completely dissolved in the 4,4'-dimethyl acetamide; pressing the resulting mixing solution into a reaction kettle; adding a calculated mixture comprising 4,4'-oxydiphthalic anhydride, 3,3',4,4'-biphenyl tetracarboxylic diandhydride and pyromellitic dianhydride to the reaction kettle, carrying out a reaction for 4 hours to form a sol type polyamide acid resin, wherein the viscosity of the resin is adjusted by adjusting the amount of the residual anhydride. The prepared formable polyimide film by the method of the present invention can not be deformed after forming, and good physical properties, good electrical properties and good mechanical properties of the film can be maintained.

The present invention relates to a polyimide laminate obtained by: casting, onto a substrate, a polyamic acid solution composition including a phosphorus compound, and a polyamic acid that is obtained from a tetracarboxylic acid component including 3,3',4,4'-biphenyltetracarboxylic acid dianhydride as a principal component, and a diamine component including para-phenylenediamine as a principal component; and heating the above to form a polyimide layer having a thickness of less than 50 [mu]m on the substrate.

The invention provides automotive abrasion-resistant damping rubber and preparation method thereof. The preparation method comprises the following steps that 1, natural rubber and polybutadience rubber are added to a mixer for mixing; 2, the rubber material obtained in the step 1, high-abrasion-resistance carbon black N330, zinc oxide, stearic acid, N-isopropyl-N'-phenyl para-phenylenediamine, styrenated phenol, dibenzothiazyl disulfide, tetramethyl thiuram disulfide, polyether urethane modified epoxy resin, polyacrylate toughened and modified epoxy resin, nano silicon carbide, calcium sulfate whiskers and magnesium borate whiskers are added to the mixer for mixing; (3) sulfur is added to the rubber material in the step 2 for mixing again; 4, the rubber material obtained in the step 3 is vulcanized in a vacuumizing and vulcanizing machine. The automotive abrasion-resistant damping rubber has good elasticity, mechanical properties and abrasion-resistant properties.

The present invention provides a low-cost and good-performance rubber composite material and a preparation method thereof. The method provided by the present invention has characteristics of simple process and low cost, and is applicable for the industrial production. The composite material is prepared from the following raw materials, wherein the raw materials comprise, by weight, 60-70 parts of fluororubber, 10-15 parts of nitrile butadiene rubber, 1-2 parts of calcium hydroxide, 3-5 parts of magnesium hydroxide, 1-2 parts of micro crystalline wax, 1-2 parts of sulfur, 2-3 parts of dihydroxyhenzene, 1-2 parts of an accelerating agent N-cyclohexyl-2-benzothiazole sulfenamide C13H16N2S2 and 1-2 parts of an anti-aging agent N-phenyl-N'-yl-para-phenylenediamine. According to the present invention, the wear resistant rubber composite material has excellent wear resistance, the weight of the rubber composite material is lighter than the weight of the metal, such that the high-performance and wear-resistant rubber provided by the present invention can be widely applicable for the workplaces with requirements of wear resistance, high temperature resistance and low temperature resistance so as to substantially improve the service lives of the work-piece, the device and the like.

Disclosed is a high-strength copolymerized aramid fiber which includes aramid copolymers containing an aromatic group substituted with a cyano group (—CN), so as to have an intrinsic viscosity (IV) of 6.0 to 8.5, a polydispersity index (PDI) of 1.5 to 2.0, a strength of 23 to 32 g/d, and an elastic modulus of 1,100 to 1,300 g/d. The high-strength copolymerized aramid fiber may be prepared by a method which includes, when para-phenylenediamine, cyano-para-phenylenediamine, and terephthaloyl dichloride are sequentially added to an organic solvent and reacted together to prepare a copolymerized aramid fiber, adding and dispersing a neutralizing agent in the organic solvent before the reaction of the para-phenylenediamine, cyano-para-phenylenediamine and terephthaloyl dichloride, which were dissolved in the organic solvent.

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.

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 concerns yarns comprising copolymer derived from the copolymerization of para-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 the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.

The present disclosure relates to novel secondary para-phenylenediamines having a carboxyl group. The present disclosure further relates to a dye composition comprising at least one secondary para-phenylenediamine for dyeing keratin fibers, such as human hair, a process for preparing the composition, and a process and kit for dyeing keratin fibers using the composition.

The invention relates to a reactive navy blue dyestuff for nylon dyeing, which has a structural formula (I) and is prepared by a method comprising the following steps of: (a) adding hydrochloric acid solution and solution of sodium nitrite into para(meta)-nitroaniline; (b) adding H acid into the solution of the step (a); (c) dissolving cresidine para-ester in water; (d) adding the solution obtained in the step (c) into aqueous solution of cyanuric chloride, and adding para-phenylenediamine into the mixture after reaction; (e) adding the hydrochloric acid solution into the solution of the step(d), and then adding the solution of the sodium nitrite into the mixture; (f) dropping the solution of the step (e) into the solution of the step (b); and (g) converting beta-sulfate ethyl sulfone ofan alkaline coupling fluid obtained in the step (f) into vinyl sulfone groups under an alkaline condition so as to prepare the compound of the structural formula (I).

The present disclosure relates to double secondary para-phenylenediamine dye compounds. The present disclosure further relates to a dye composition comprising at least one double secondary para-phenylenediamine compound, a process for dyeing keratin fibers using the composition, and a kit for dyeing keratin fibers comprising a separate composition comprising an oxidizing agent.

The invention discloses a preparation method of a catalyst used for synthesizing a phenylenediamine rubber anti-aging agent. The catalyst comprises an activated carbon carrier, and platinum, iron andnickel supported on the activated carbon carrier. The preparation method of the catalyst comprises the following steps: step 1, preparing the activated carbon carrier; step 2, preparing a solution containing iron and nickel; step 3, preparing slurry containing nano iron and nickel; step 4, preparing a platinum-containing solution; and step 5, adding hydrazine hydrate into the slurry containing thenano iron and nickel, adding the platinum-containing solution dropwise, performing heat-preservation impregnation, performing cooling, performing filtration, and washing the filter cake to obtain thecatalyst. According to the method provided by the invention, the auxiliary metal nano nickel and iron are preferentially adsorbed by the activated carbon to modify platinum carbon, the nano iron andnickel and the activated carbon carrier are more firmly adsorbed, so that instability of performance of the catalyst caused by loss of the auxiliary metals is avoided, the activity of the catalyst isimproved, and the selectivity and stability of the catalyst are enhanced; and the prepared catalyst can be used for a synthetic reaction of the phenylenediamine rubber anti-aging agent, and the catalyst has high reaction activity, high selectivity and good stability.