203 results about "Paraphenylene diamine" patented technology

The invention relates to a preparation method of a nitrogen and phosphorus containing flame retardant agent, the nitrogen and phosphorus containing flame agent and application thereof. The preparation method comprises the following steps of: carrying out condensation reaction on phenylene diamine and aromatic aldehyde, then carrying out addition reaction with DOPO (9, 10-Dihydro-9-oxa-10-phosphaphenanthrene 10-oxide) to obtain solid nitrogen and phosphorus containing flame retardant agent molecules. The preparation method has the advantages of easiness in control, good repeatability, high yield and suitability for expanded production. The obtained flame retardant agent molecules have amino groups and phenolic hydroxyl active groups and can further react with matters containing expoxy group functional groups. The flame retardant agent molecules contain nitrogen and phosphorus elements and have good expansion char forming characteristic and very good flame retardant effect in the burning process; when the flame retardant agent molecules resist the flaming of the epoxy resin, the flame retardant agent molecules can further undergo cross-linking reaction with resin, thereby increasing the glass transition temperature, the bonding strength, the mechanical property and the like of the resin; meanwhile, the flame retardant agent molecules have good flame retardant property; the limiting oxygen index of the flame retardant agent molecules is substantially increased; and the vertical burning grade of the flame retardant agent molecules reaches a UL-94V-0 grade.

A process for preparing the polyether imide material as the base material of flexible printed circuit includes such steps as polycondensation between triphenyldiether tetrabasic acid bianhydride, biphenyl tetrabasic acid bianhydride, p-phenyldiamine and 3,3'-dimethyl-4,4'-diaminobibenzene, synthesizing polyamide, varnish, coating it on copper foil and high-temp. imidating. Its advantages are low expansibility and no curling.

The present invention discloses a method for continuously preparing poly(p-phenylene terephthalamide) resin, said method includes the following steps: (1). after the p-benzenediol powder is completely dissolved in the solvent containing cosolvent, adding P-benzenediol solid and terephthaloyl powder into extruder according to the ratio of 1:1-1.01; (2). feeding the solvent contaiing P-benzenediol and cosolvent into extruder adopting low-temperature medium cooling, its temperature is -20-5 deg.C, the residence time of reaction system in reactor is 2-25 min, polycondensation temp. is 30-90 deg.C, after the reaction is completed, extruding the above-mentioned material; and (3). making the extruded polymer body undergo the processes of standing still, washing, dewatering and drying so as to obtain light yellow polymer body powder.

The present invention relates to a method for synthesizing p-phenylene diisocyanate. Said method includes the following steps: adding inert organic solution of di(trichloromethyl) carbonate into reaction flask, introducing nitrogen gas to make protection, under the condition of cooling slowly adding inert organic solution of p-phenylene diamine, making reaction for 2-4 hr, at 15-200 deg.C and 0-0.3 MPa, after the reaction is completed, removing solvent, filtering and washing so as to obtain solid product p-phenylene diisocyanate.

The invention provides a novel process for preparing p-phenylene diisocyanate (PPDI) based on phosgene, which relates to a process for preparing chemical raw materials, in particular to a novel process for preparing the p-phenylene diisocyanate (PPDI). The process comprises the following steps: 1, hydrochloric acid formation reaction; 2, salifying reaction; and 3, photochemical reaction which is to transfer a mixture solution of para-phenylene diamine dihydrochloride-o-dichlorohenzene to a photochemical kettle, control the temperature, introduce the phosgene in an infinite reflux state to react, determine that the reaction is terminated after reaction materials are settled, introduce quantitative nitrogen to remove acid, sample and analyze the reactant, and obtain the p-phenylene diisocyanate PPDI through rectifying, crystallizing, centrifugating, drying, packaging or refining, slicing and packaging when the acidity content is qualified. In the process, a reasonable salifying reactioncondition is customized to avoid slow reaction of a prepolymer, complicated reaction mechanism, and easy generation of side products and adverse factors influencing the reaction in the next step.

The present invention provides aniline oligomers, their aliphatic polyester copolymer and their preparation. Two kinds of aniline oligomers are first synthesized with N-phenyl-1, 4-p-phenylene diamine as material, and then copolymerized with aliphatic polyester to obtain electrically active biodegradable polymers. During the preparation, N-phenyl-1, 4-p-phenylene diamine has its end amido group protected with butanedioic anhydride and is then reacted with end amido aniline dimer and phenylene diamine to obtain aniline tetramer with one end carboxyl group and one end amino group and aniline pentamer with two end carboxyl groups; and the aniline oligomers are finally polycondensated with double hydroxyl group terminated aliphatic polyester to obtain the copolymers containing electrically active aniline oligomer block. The copolymers possess the advantages of both aniline oligomer and aliphatic polyester, and is used as biomedicine material mainly.

The invention belongs to a method for producing phenylene diamine, in particular to the method for producing the phenylene diamine by performing hydrogenation reduction on mixed dinitrobenzene with palladium catalyst. The prior art which produces the phenylene diamine by performing the hydrogenation reduction by adopting a Raney nickel or carrier nickel catalyst has the disadvantages of high energy consumption, low raw material conversion rate, and poor product quality. The method comprises the following steps of: adding 100 weight parts of dinitrobenzene, 100 to 200 weight parts of alcohols solvents and 0.5 to 1 weight part of the palladium catalyst into a reaction kettle, wherein the temperature in the reaction kettle is between 40 and 60 DEG C and the pressure is between 0.25 and 0.60 MPa; performing hydrogenation for 30 to 120 minutes; conveying a reaction product to a filter; dealcoholizing in a dealcoholization tower for recovering to obtain phenylene diamine solution; and obtaining m-phenylenediamine, o-phenylenediamine and p-phenylenediamine products by dewatering, rectifying and separating. The method has the advantages of improving product quality, reducing raw material consumption and reducing production cost.

The invention discloses a rubber antioxidant and a preparation method thereof. The rubber antioxidant is prepared through the complex reaction of para-phenylene diamine antioxidant and autunite-zinc polymethyl terephthalate; wherein the weight ratio of para-phenylene diamine antioxidant to autunite-zinc polymethyl terephthalate is 2:1-3:1. The preparation method includes the following steps: 1)dissolving para-phenylene diamine antioxidant in acetone solution based on weight ratio of 1:1-1.5:1, producing a mixture solution; 2)adding autunite-zinc polymethyl terephthalate aqueous solution and hyamine catalyzer at the same time into a reactor and blending the two; 3)introducing high temperature steam to the jacket of the reactor and when the temperature reaches 110-120 DEG C, adding the mixture ssolution prepared in step 1); 4) conducting complex reaction for 1.5-3h when the material is at infinite reflux state and finally distilling and recovering the acetone. The rubber antioxidant is of excellent ageing resistance and is free from problems of serious color deterioration, fusion and agglomeration.

Disclosed is a thermoplastic polyimide which has excellent heat resistance and can adhere to a metal foil by thermocompression bonding for a short-time. The thermoplastic polyimide comprising a tetracarboxylic dianhydride residue and a diamine residue wherein the biphenyl tetracarboxylic dianhydride residues account for 80 mol % or more of the total tetracarboxylic dianhydride residues, the 4,4′-diaminodiphenyl ether residues for 65 mol % or more and 85 mol % or less of the total diamine residues, and the paraphenylene diamine residues for 15 mol % or more and 35 mol % or less of the total diamine residues.

A process for preparing high-stability modified asphalt features that the asphalt is modified by thermoplastic olefine polymer (SBS) or unsulfurized rubber (SBR) while a composite stabilizer is added, which is prepared from arylhydrocarbon concentration regulator, zinc oxide, S,N-substituted 2-benzothiazole sulfenamide, zinc dithioaminoformate, and p-phenyldiamine.

The invention relates to a method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light and belongs to the technical field of preparation of photocatalysts. The method comprises the following steps: synthesizing S-doped TiO2 by taking TiCl4 as a titanium source by a hydrothermal method; and performing chemical oxidative polymerization by taking phenylenediamine as a monomer and a crosslinking agent and organic pollutants as template molecules to synthesize the molecular imprinting-doped TiO2. Compared with the S-doped TiO2, the synthesized molecular imprinting-doped TiO2 has stronger adsorption capability on the organic pollutants and higher catalytic degradation activity on the organic pollutants under the visible light, improves the catalytic degradation capability by 30%, and has a high actual application value.

The invention discloses a lithium battery composite diaphragm coated with hybrid aramid fibers and a preparation method of the lithium battery composite diaphragm. One side or two sides of the batterydiaphragm are coated with the hybrid aramid fibers, and the hybrid aramid fiber coating is formed by the coating slurry containing hybrid aramid fibers. The hybrid aramid fibers are fibers made of one or two of poly (p-phenylene Isophthalamide) and poly-m-phenylene terephthalamide. The aramid fibers are employed for forming the hybrid aramid fiber coating, and the hybrid aramid fibers are low insensitivity to water, are not liable to separate out and are easy to store, so that the water tolerance of the aramid fiber slurry is greatly improved, the storage cost of the aramid fiber coating slurry and the requirements on coating equipment are reduced. The lithium battery diaphragm is suitable for industrial production.

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 discloses a compound 2-methyl-5-chloro-1,4-p-phenylenediamine, its preparation method and use. It is characterized by that under the acidic condition 2-methyl-5-chloro-phenylamine and acetic anhydride are reacted to obtain N-acetyl-2-methyl-5-chloro-phenylamine, then it uses a mixed acid to make said obtained material undergo the process of nitrate to obtain N-acetyl-2-methyl-4-nitro-5-chloro-phenylamine, and then makes said material undergo the hydrolysis to remove acetyl, and finally utilizes hydrochloric acid and adds the iron powder to make reduction to obtain the invented product. Said compound can be used for synthesizing paint, and synthesizing dyestuff, also can be used for preparing colour developing reagent.