248 results about "Poly(p-phenylene)" patented technology

The invention discloses a semi-continuous preparation method of poly p-phenylene terephthalamide resin which comprises the steps of, proceeding pre-polycondensation to p-phenylene diamine and part of the paraphthaloyl chloride into the dissolvent architecture of solvent and assisting solvent, charging in pre-polymerization member and the remaining paraphthaloyl chloride powder into double bolt extrusion machine, letting in dried liquid ammonia to neutralize the hydrogen chloride gas produced in the reaction, and charging macromolecular addictive polyvinylpyrrolidone into the double bolt extrusion machine to obtain the polymer.

This invention provides a method for preparing PPTA amide paper including the following steps; adding 20-90% PPTA short fibers, 0-40% PPTA fibril chemical fibers, 1-80% PPTA pulp cakes and scattering aids to scatter them to get sizing materials to be formed on net to be de watered, squeezed and dried to be formed by thermal pressure. The proportion of said components is weight percentage. The paper can be used in structure materials, insulation materials of transformers or motors cellular, heat isolation, flame resistance, filtration and electronic materials.

The present invention relates to a high-molecular fiber composite material covered with nano inorganic powder body and its preparation method. It is made up by using at least one chemical fiber selected from poly-p-phenylene benzodioxazole fiber, aramid fiber and ultrahigh-molecular polyethylene fiber as matrix, using at least one nano inorganic powder body selected from nano titanium dioxide, nano silicone oxide, nano magnesium oxide, nano zinc oxide, nano aluminum oxide, nano zirconium oxide, nano nickel oxide and nano cobalt oxide as intermediate covering body and adopting impregnation coating process.

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 invention relates to the field of friction materials in automobile transmission structures, and discloses a poly-p-phenylene terephthamide composite fiber dry clutch facing which is prepared from the following substances: 30-70 parts of composite fibers, 15-40 parts of adhesive, 2-10 parts of rubber compound ingredients, 5-20 parts of a friction performance modifying agent, and 5-20 parts of fillers. The invention further discloses a preparation method of the poly-p-phenylene terephthamide composite fiber dry clutch facing. The preparation method comprises the following steps of (1) fiber compounding; (2) steeping and drying; (3) friction coil preparing; (4) hot press molding; (5) vulcanization heat treatment; (6) coarse grinding machining; (7) spot facing; (8) fine grinding machining; and (9) printing and marking, and packing. The poly-p-phenylene terephthamide composite fiber dry clutch facing prepared according to the preparation method has higher rotating burst strength, higher bending strength, a maximum strain value and excellent friction and wear performance and high temperature resistance. The preparation method of the poly-p-phenylene terephthamide composite fiber dry clutch facing is low in production cost, and can save 3-8 percent of raw materials effectively.

The invention provides a continuous production device for a poly-p-phenylene terephthamide resin, which belongs to the field of high molecular materials and relates to a high molecular material manufacturing technology. The continuous production device is characterized by comprising a p-phenylenediamine melt and solvent mixing and cooling device, a pre-polycondensation double-screw reactor, a combined second-order polycondensation double-screw reactor and a water washing device. After the continuous production device provided by the invention is used, the p-phenylenediamine and paraphthaloyl chloride are both fed as melts, so that continuous measurement errors are reduced and degrees of influences of flow fluctuation and solvent concentration on the mol ratio of the p-phenylenediamine and the paraphthaloyl chloride are reduced; and the obtained poly-p-phenylene terephthamide resin has the advantages of stable mass, narrow molecular weight distribution and low ash content and is suitable for industrially and continuously preparing the poly-p-phenylene terephthamide resin on a large-scale.

A process for preparing poly-p-phenylene benzdioxazole (PBO) fibres includes such steps as prepolymerizing by adding part (90-99%) of terephthalic acid to obtain low-viscosity prepolymer, mixing the rest of terephthalic acid with polyphosphoric acid (PPA) to obtain slurry, mixing it with prepolymer and polycondensating in a dual-screw extruder, and liquid-crystal spinning.

The invention relates to a proton exchange membrane and preparation method thereof, and the proton exchange membrane is a Poly-p-phenylene ben-zobisthiazole and polyphosphoric acid blend membrane (PBO/PPA), and the method for preparing the Poly-p-phenylene ben-zobisthiazole and polyphosphoric acid blend membrane (PBO/PPA) as a proton exchange membrane comprises: (1) polymerizing and obtaining a PBO/PPA slurry; (2) preparing the PBO/PPA slurry into a PBO/PPA proton exchange membrane; (3) controlling the thickness of the membrane by controlling the concentration of the polymer solution and the compacting temperature and pressure; (4) carrying out a proton conductivity test directly after the membrane is taken out and the membrane is used as a proton exchange membrane is assembled in the H2/O2 fuel monocell for investigating power generation performance. The invention selects an appropriate film forming technology according to the characteristic of the PBO rigid molecular chain, and has the advantages of simple preparation technology and easy control, and the obtained proton exchange membrane has a higher proton conductivity under high temperature with excellent power generation property.

The invention discloses a high-performance wave transmitting composite material based on PBO (poly-p-phenylene benzobisthiazole) fiber and a preparation method of the composite material. The preparation method comprises the steps of: preparing epoxy-modified cyanate resin prepolymer from PBO fiber as a reinforcing material and modified bisphenol A type cyanate resin as a substrate through a heating fusion method, wherein the used cyanate resin contains an epoxy modifier; and adding an organic solvent to prepare liquid glue, immersing and winding treated PBO fiber, obtaining a prepreg after solvent is volatilized, paving the prepreg in a mold, and preparing the PBO fiber-reinforced cyanate composite material by a high-temperature pressure molding method. The high-performance wave transmitting composite material has the advantages of high strength, high modulus, low density, excellent high-temperature resistance and dielectric properties, excellent molding process property and the like.

The invention relates to a novel method for preparing a p-aramid nanofiber solution, belongs to the field of macromolecules and also belongs to the field of nano-materials. According to the solution, p-aramid nanofibers have the diameter of 20-50nm and the length of about 10 microns. The method comprises the steps: purging a dry three-mouthed bottle with nitrogen gas for 10 minutes under the protection of nitrogen gas, adding a deprotonation reagent (sodium hydride or potassium hydride or lithium hydride) and anhydrous dimethyl sulfoxide under the protection of nitrogen gas, mechanically stirring, heating to the temperature of 70 DEG C within 20 minutes, continuously reacting for 40 minutes, and then, cooling to the temperature of 30 DEG C; and then, slowly adding poly-p-phenylene terephthalamide staple fibers, and reacting for 6-72 hours at the temperature of 30 DEG C, thereby obtaining an orange-red solution containing the p-aramid nanofibers, wherein the weight percent of the p-aramid nanofibers is 0.05-3.6%. The method disclosed by the invention is simple and is strong in operability, and a feasible method is provided for the low-cost and large-scale preparation of p-aramid nanofiber materials.

The invention discloses a method for preparing poly p-phenylene terephtha-lamide resin with high viscosity. Firstly, para-phenylene diamine is fully dissolved and added into a prereactor, then paraphthaloyl chloride is added into the prereactor for prepolycondensation, then a prepolymer is added into a double screw extruder, a pyridine acid absorbent and a remained paraphthaloyl chloride low-temperature solution are respectively and synchronously added for a final polycondensation reaction through a liquid metering pump, and the extrusion is performed; and a polymer is kept stand, washed, dehydrated and dried. The inherent viscosity of the poly p-phenylene terephtha-lamide resin prepared by the method is between 6.5 and 9.5dl/g, the resin has good spinnability, and the spun fiber has good color and luster, high strength, and stable performance.

The invention relates to a preparation method of black p-aramid fiber. The black p-aramid fiber obtained by the preparation method has high fiber strength and is fadeless. The preparation method comprises the following steps of: (1) dispersing multi-walled carbon nanotubes in concentrated sulfuric acid to obtain carbon nanotube dispersion, wherein the weight ratio of the multi-walled carbon nanotubes to concentrated sulfuric acid is 1:(100-500), the average wall number of the multi-walled carbon nanotubes is 2-6, the average diameter of the multi-walled carbon nanotubes is 1-20nm, and the average length of the multi-walled carbon nanotubes is 0.5-20mu m; and (2) dissolving poly-p-phenylene terephthamide to the carbon nanotube dispersion to obtain a spinning stock solution, filtering and debubbling the spinning stock solution, spinning by a dry-jet wet spinning method, washing with base, washing with water, drying and carrying out heat treatment to obtain the black p-aramid fiber, wherein the weight ratio of poly-p-phenylene terephthamide to the carbon nanotube dispersion is 1:(3.9-4.1), and the intrinsic viscosity of poly-p-phenylene terephthamide is 6-8dL/g<3>.

A 5- amino-6-hydroxy-2-MAB and its production are disclosed. The production is carried out by: (1) R1-R2, green synthesizing 4-amino-6-ANR.HCL by resorcinol; (2) R3: preparing AB monomer precursor 5-nitro-6-hydroxy-2-NHAB, and refining purifying; (3) R4: catalyst hydrogenating reducing NHBA nitro group, and obtaining high-purity AB PBO monomer. It achieves simple process, short polymeric time and normal polymeric apparatus.

The invention discloses a brake pad made of a composite material. The brake pad comprises a steel sheet and a friction block, and the friction block is prepared from boron-modified phenolic resin, organic silicone-modified phenolic resin, barium phenolic resin, phenylacetylene phenolic resin, epoxy-terminated liquid reaction type nitrile rubber, butadiene rubber, molybdenum disulfide, sisal fiber, bamboo carbon fiber, aluminum fiber, molybdenum fiber, poly-p-phenylene benzodioxazole fiber, zinc oxide crystal whiskers, montmorillonite, vermiculite, nanometer aluminum oxide, cerium oxide, zirconium boride, aluminum silicate hollow spheres, graphene oxide, copper powder, carbon nano tubes, nano carbon black, butadiene styrene rubber powder, ammonium molybdate and octaphenyl silsesquioxane. The brake pad made of the composite material is high in high temperature resistance, excellent in heat stability, high in abrasion resistance and long in service life.

The invention provides a continuous polymerization method of high-viscosity poly-p-phenylene terephthamide. Based on the design of the polymerization formula, and the design and use of a novel mixing device and a hydrogen chloride discharge device matched with the design of the polymerization formula, continuity of the PPTA (poly-p-phenylene terephthamide) polymerization is guaranteed, and the molecular weight of the obtained PPTA is high. The method is characterized by comprising the following steps of: preparing materials, namely dissolving hydrotropy salt and PPD (p-Phenylenediamine) at a low temperature; keeping the TPC (paraphthaloyl chloride) in molten state; mixing, by combination of a Venturi jet mixer and a dynamic or static mixer, ensuring even mixing of the TCP and the PPD solution; and polymerization, finishing the polymerization of the PPD and the TPC by a double-screw reactor, and eliminating the hydrogen chloride released by some reaction. The continuous polymerization method has the advantages of improving the stability of the PPD and TCP reaction, ensuring the continuity and the stability of the production, and facilitating the high-efficiency separation of the hydrogen chloride; by the continuous polymerization method provided by the invention, polymerization production of high-viscosity PPTA can be realized steadily and continuously.

The invention relates to an industrial method and a polycondensation reactor for continuously preparing poly-p-phenylene terephthamide resin with high viscosity, comprising the following steps: (1) compounding a flux into an aqueous solution, then mixing with solvent to remove water by refinement and continuously and stably obtaining a solvent system with the water content conforming to the requirement, wherein the weight percentage of the flux in the solvent system is from 6 percent to 15 percent; (2) performing the polycondensation reaction of para-phenylene diamine (PPD) and terephthalyl chloride (TPC) in the mol ratio of 1.01-1 to 1-1.01 in the solvent system prepared in the step (1), and obtaining a polymer after reaction; and (3) obtaining the poly-p-phenylene terephthamide resin in yellow powder after pulverizing, neutralizing, washing and drying the polymer. By utilizing the method, the adverse effects of weather and operation on the polymerized solvent system water is overcome, and continuous, closed and clean production is realized.

The invention provides a silicone rubber-based heat-insulating coating and a preparation method thereof. The silicone rubber-based heat-insulating coating comprises heat-insulating coating, radiationcoating and ablation coating, wherein the heat-insulating coating is arranged on the surface of a substrate; the radiation coating is arranged between the heat-insulating coating and the ablation coating; the heat-insulating coating, the radiation coating and the ablation coating are silicone rubber-based coating; the radiation coating performing an in-situ ceramization reaction through heat penetrating through the ablation coating; poly-p-phenylene benzobisoxazole fiber is distributed in the ablation coating. The preparation method comprises the steps of preparing the ablation coating, the radiation coating and the heat-insulating coating. Compared with the prior art, the silicone rubber-based heat-insulating coating has the beneficial effects as follows: through use of the poly-p-phenylene benzobisoxazole fiber, the mechanical properties of the ablation coating are improved; through the in-situ ceramization reaction, the high-radiation coating is prepared, and the defects of low mechanical properties and heat-insulating performance of the silicone rubber-based heat-insulating coating are successfully overcome; the silicone rubber-based heat-insulating coating has a wide application prospect in the field of heat protection of structural surfaces of rocket-carrying and missile weapons and the like.

The invention discloses a continuous polymerization device which prepares PBO, which relates to a continuous polymerization device. The invention brings about solutions to the stirring problems caused by the high viscosity of PBO polymer and to the low molecular weight problems existed in the polymer which is prepared by current manufacturing process. The discharge hole of the pre-polymerization reactor of the invention is communicated with the charging hole of screw extruder unit which consists of 2-10 full-bay screw extruders which are connected by in-line platform combination or staging pack; wherein the screw, screw barrel, the charging hole, the discharge hole are acid-resisting and corrosion-resisting; the working temperature for screw is 20-300 DEG C, the extrusion pressure for the screw extruder is 0.1-30 MPa, the diameter D for the screw is 20-200 mm, the length-diameter ratio L/D for the screw is 10-60, the rotation speed is 1-1000r/min, and the vacuum degree in the screw is minus 0.1 MPa. The continuous polymerization device has the advantages of improved molecular weight, quick reaction speed, short manufacturing cycle, uniform material mixture and full reaction, which can realize continuous operation and is conductive to commercial process.

The invention relates to a preparation method of poly-p-phenylene terephthamide resin. The preparation method is characterized by comprising the following steps: (1) preparing a p-phenylenediamine solution; (2) preparing paraphthaloyl chloride molten mass; (3) subjecting the p-phenylenediamine solution and the paraphthaloyl chloride molten mass to a pre-polymerization reaction; (4) carrying out a condensation reaction to prepare the poly-p-phenylene terephthamide resin. The prepared poly-p-phenylene terephthamide resin powder has the advantages of high polymerization degree, uniform particle, narrow molecular weight distribution, and small repose angle. During the whole technology process, the paraphthaloyl chloride is added in a molten state, so the metering is relatively simple, the precision is high, the production stability is higher, and the production period is longer. Moreover a mixer and a pre-reactor are adopted, the thermal energy generated by the reactions can be effectively distributed to the mixer, the pre-reactor, and a double-screw reactor, thus the thermal transmission problem is solved, and the polymerization process is controllable.

The invention discloses a lithium battery. The lithium battery comprises a cellulose non-woven fabric diaphragm and an electrolyte, wherein the electrolyte contains an ionic liquid solvent; the cellulose non-woven fabric battery diaphragm is selected from one or more of polypropylene fiber, polyacrylonitrile fiber, formalized polyvinyl alcohol fiber, polyethyleneterephthalate, polyethylene glycol terephthalate, nylon and poly-p-phenylene terephthamide. The ionic liquid solvent is preferably selected from aliphatic quaternary ammonium salt, quaternary phosphonium salt, pyrrole salt, pyrrolidone salt, imidazolium salt and piperidine salt. Meanwhile, the invention provides the high-safety cellulose non-woven fabric diaphragm and the ionic liquid solvent, and the problem that the wettability of the ionic liquid solvent with a traditional polyolefin diaphragm is low is also solved, so that the charge and discharge performance of the power battery is improved, and the safety of the lithium battery is doubled and improved.

The invention discloses a positive electrode material. The positive electrode material comprises a positive electrode active material and a conductive agent, wherein the positive electrode active material can realize deintercalation-intercalation of first metal ions in a reversible manner; the conductive agent comprises a conductive polymer; the conductive polymer is selected from at least one kind of polyacetylene, polyphenylene sulfide, polyquinoline, poly-phenylene vinylene, poly-p-phenylene, polypyrrole, polyaniline, polythiophene and poly-3, 4-ethylenedioxythiophene-polystyrolsulfon acid; and the conductive agent accounts for 6-15% of the positive electrode material based on mass percentage. The invention also discloses a battery, wherein the battery comprises a positive electrode, a negative electrode and an electrolyte; and the positive electrode comprises the positive electrode material. According to the positive electrode material, the conductive polymer is used as the positive electrode conductive agent; and the conductive polymer has high stability and conductivity, so that the internal resistance of the battery is lowered while the service life of the battery is prolonged.