89 results about "Paraphenylene diamine" patented technology

The invention relates to the technical field of aromatic polyamide high polymers, in particular to a modified poly-p-phenylene terephthamide fiber with high elongation at break and a preparation method of the modified poly-p-phenylene terephthamide fiber. According to the invention, a small amount of 3, 4-difluorobenzene is introduced According to the preparation method, the third monomer containing 4, 4 '-diaminodiphenyl ether and the fourth monomer containing a diaminophenoxy functional group are added, and the molar ratio of the third monomer and the fourth monomer in the total amount of the diamine monomer is controlled, so that the rigid molecular chain structure of the conventional para-aramid fiber is destroyed to a certain extent, the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, and the service life of the polymer fiber is prolonged. The prepared modified poly-p-phenylene terephthamide can still adopt a dry-jet wet spinning process, the cost of a new production line of a factory is saved, the fiber with stable elongation at break index is obtained by optimizing process conditions and parameters, and the elongation at break of the prepared fiber is 3.6% or above.

The invention relates to the technical field of high polymer materials, in particular to a block copolymerization modified para-aramid polymerization solution and a preparation method and application thereof.The preparation method comprises the steps that in the inert gas atmosphere, hydrotropy salt is dissolved in an organic solvent to obtain the polymerization solution; adding a third monomer and terephthaloyl chloride into the polymerization solution, and controlling the reaction temperature to carry out pre-polycondensation reaction to obtain an amino-terminated oligomer system; adding p-phenylenediamine and paraphthaloyl chloride into the oligomer system, and controlling the stirring reaction temperature to carry out block copolymerization reaction under the stirring condition; and after the block copolymerization reaction is finished, adding a neutralizer to neutralize acidic substances generated in the reaction process, and finally obtaining the modified para-aramid polymer liquid in the neutral environment. The polymer liquid is applied to the field of lithium battery diaphragms, and the modified aramid fiber coated diaphragm which is excellent in thermal shrinkage performance, high in diaphragm rupture temperature, porous in structure and high in puncture resistance is obtained.

The invention discloses an organic wastewater treatment agent and a preparation method thereof, and relates to the field of water treatment materials. When the organic wastewater treatment agent is prepared, nano silicon dioxide sequentially reacts with a silane coupling agent 4140, sodium periodate, p-phenylenediamine and dimethyl phosphite, and modified nano silicon dioxide is prepared; the preparation method comprises the following steps: reacting modified nano silicon dioxide with 2, 4, 6-triformyl phloroglucinol and 2, 4-diamino-6-methoxypyrimidine, so as to prepare functionalized nano silicon dioxide; the preparation method comprises the following steps: reacting microcrystalline cellulose with thionyl chloride, N-(glycidyl)-N-phenyl-ethylene oxide methylamine and thiourea in sequence to prepare modified cellulose; and reacting the modified cellulose with the functionalized nano silicon dioxide to prepare the organic wastewater treatment agent. The organic wastewater treatment agent prepared by the invention has the capabilities of resisting bacteria, adsorbing anionic pollutants, adsorbing cationic pollutants and photocatalytically degrading organic pollutants.

An article, a method of making the same, and a method of using the same are provided. Such an article includes at least one coated layer, which includes a substrate and a coating disposed on the substrate. The coating includes a layered nanomaterial and a solute embedded and distributed in the layered nanomaterial. The solute comprises at least one salt soluble in a solvent. The substrate comprises a polymer, for example, a high-performance polymer such as polyether ether ketone and poly(para-phenylene terephthalamide). The article is used for thermal management applications, for example, as protective garment.

The invention relates to a composition comprising at least one oxidation base chosen from 2-methoxymethyl-para-phenylenediamine of formula (I), one of its addition salts, its solvates and / or the solvates of its salts, at least one oxidation coupler chosen from 6-hydroxybezomorpholine of formula (II), one of its addition salts, its solvates and / or the solvates of its salts, at least one amphoteric or zwitterionic surfactant, and at least one solid fatty substance.The invention also relates to a process for dyeing keratin fibres, preferably the hair, comprising the application to said keratin fibres of the composition.

The invention discloses a method for extracting a p-phenylenediamine antioxidant in a liquid sample and application of the p-phenylenediamine antioxidant. The p-phenylenediamine antioxidant comprises N-(1, 2, 4-trimethyl-1, 3-pentanediol) the organic solvent is at least one of N, N '-diphenyl-1, 3-dimethyl butyl)-N'-phenyl p-phenylenediamine, N-cyclohexyl-N '-phenyl p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N, N '-diphenyl-1, 4-phenylenediamine, N, N'-di-2-naphthyl p-phenylenediamine and 2-((4-methylpentane-2-yl) amino)-5-(phenyl amino) cyclohex-2, 5-diene-1, 4-diketone. According to the method, liquid-liquid extraction which is simple and efficient to operate, low in cost and good in repeatability is adopted as a sample pretreatment method, and is combined with an isotope label method and an ultra-high performance liquid chromatography-tandem mass spectrometry technology, so that separation and qualitative and quantitative detection of six p-phenylenediamine antioxidants and quinone derivatives in a sample are realized; meanwhile, the sensitivity is high, the quantity of isotope internal standards is small, the solvent loss is small, and the actual detection requirement is met.

The invention provides a continuous preparation method of a para-aramid polymer. The continuous preparation method comprises the following steps: (a) mixing p-phenylenediamine and a polar solvent to obtain a p-phenylenediamine solution; (b) melting the terephthaloyl chloride to obtain molten terephthaloyl chloride; (c) introducing the p-phenylenediamine solution prepared in the step (a) and part of the molten-state terephthaloyl chloride prepared in the step (b) into a micro-channel reactor for reaction to obtain a prepolymer; (d) mixing the prepolymer prepared in the step (c) with the remaining molten terephthaloyl chloride prepared in the step (b), and reacting to obtain a para-aramid polymer; and the micro-channel reactor is a single-channel micro-reactor. According to the continuous preparation method provided by the invention, the materials are uniformly mixed, the reaction heat can be quickly removed, the side reaction is effectively controlled, and the prepared para-aramid polymer has the characteristics of narrow molecular weight distribution, stable performance and good particle size uniformity.

The invention relates to the technical field of high-molecular polymerization and molding, in particular to a modified para-aramid stock solution, a preparation method and para-aramid fibers.The preparation method comprises the steps that under the inert gas condition, diamine and a chlorosilane polycondensation agent react in a weakly-alkaline polar aprotic solvent, and a silanization modified diamine solution is obtained; the diamine comprises diaminodiphenyl ether and p-phenylenediamine; adding paraphthaloyl chloride into the silanization modified diamine solution to carry out a copolymerization reaction, and after the reaction is finished, carrying out neutralization treatment to obtain the modified para-aramid stock solution. According to the preparation method of the modified para-aramid stock solution, the modified diamine does not need to be independently purified, the high-viscosity modified para-aramid stock solution can be directly obtained, and the modified para-aramid stock solution is high in polymer specific concentration logarithmic viscosity and high in molecular weight, so that a high-quality and stable-quality para-aramid fiber product is more favorably obtained.

The invention discloses a high-strength para-aramid fiber and a preparation method thereof.The preparation method comprises the steps that under nitrogen protection, graphene oxide, anhydrous lithium chloride, p-phenylenediamine and paraphthaloyl chloride serve as raw materials, a low-temperature polymerization reaction is conducted, an obtained solid product is mixed with sulfuric acid, and a spinning solution is obtained; the spinning solution is subjected to dry-jet wet spinning, and the para-aramid fiber is obtained through the technological steps of coagulating bath, water washing, alkali washing, drying and winding; the preparation method comprises the following steps: immersing para-aramid fibers into an acetone solution of isopropyl tri (dioctyl pyrophosphate acyloxy) titanate, carrying out ultrasonic treatment, washing and vacuum drying, and carrying out high-temperature constant tension treatment to obtain the high-strength para-aramid fibers. Graphene oxide is introduced into para-aramid fibers, meanwhile, an acetone solution of isopropyl tri (dioctylpyrophosphate acyloxy) titanate is used for conducting dipping modification treatment on the para-aramid fibers, then high-temperature constant-tension treatment is conducted, and the mechanical property of para-aramid is further improved.

The invention relates to a composition comprising at least one oxidation base chosen from 2-methoxymethyl-para-phenylenediamine of formula (I), one of its addition salts, its solvates and / or the solvates of its salts, at least one oxidation coupler chosen from 6-hydroxybenzomorpholine of formula (II), one of its addition salts, its solvates and / or the solvates of its salts, at least one amphoteric or zwitterionic surfactant, and at least one solid fatty substance. The invention also relates to a process for dyeing keratin fibers, preferably the hair, comprising the application of the composition to said keratin fibers.

The present invention discloses a continuous, highly heat-resistant, and environmentally friendly para-aramid diaphragm and a preparation method thereof. The continuous, highly heat-resistant, and environmentally friendly para-aramid diaphragm is coated with a continuous, highly heat-resistant, and environmentally friendly para-aramid coating slurry. The continuous, highly heat-resistant, and environmentally friendly para-aramid coating slurry is prepared using a twin-screw extruder through a first slurry, a second slurry, and a third slurry. The first slurry includes: para-phenylenediamine; the second slurry is a molten liquid of terephthaloyl chloride; and the third slurry includes: fumed silica and boehmite. The twin-screw extrusion method is used to achieve a high-efficiency continuous synthesis step during the synthesis of the continuous, highly heat-resistant, and environmentally friendly para-aramid coating slurry. The fumed silica and boehmite are mixed so that the para-aramid fibers adsorb the fumed silica, increasing the gaps between the fibers and reducing the aggregation of the fibers due to hydrogen bonds. During the coating process, a high-humidity environment and ultrasonic spraying are used to pre-cure the diaphragm surface and reduce the extraction concentration.

The present invention provides a polyimide film and a method for manufacturing the polyimide film, wherein the polyamic acid solution is obtained by imidizing a dianhydric acid component comprising two or more selected from the group consisting of benzophenone tetracarboxylic dianhydride (BTDA), biphenyltetracarboxylic dianhydride (BPDA), and pyromellitic dianhydride (PMDA), and a diamine component comprising paraphenylene diamine (PPD), wherein, based on a total content of 100 mol% of the diamine component, the content of paraphenylene diamine is 70 mol% or more and 100 mol% or less, and based on a total content of 100 mol% of the dianhydric acid component, the content of biphenyltetracarboxylic dianhydride is 50 mol% or more and less than 100 mol%, the dielectric loss rate (Df) is 0.003 or less, and the light transmittance at a wavelength of 550 nm is 15% or more and 50% or less.

A polyamide acid according to the present invention includes a tetracarboxylic acid dianhydride residue and a diamine residue. The tetracarboxylic acid dianhydride residue includes a 3,3',4,4'- biphenyltetracarboxylic acid dianhydride residue. The diamine residue includes a p-phenylenediamine residue and a siloxane diamine residue. At least one of the tetracarboxylic acid dianhydride residue and the diamine residue further includes a residue derived from a compound in which a plurality of aromatic rings are linked via a linking group. The linking group is one or more items selected from the group consisting of ether groups and ester groups.

Stabilized indicator compositions, and systems and methods using the same are described. In embodiments the stabilized indicator compositions include a solvent, an indicator, a stabilizer for the indicator, and optionally a buffer. In embodiments the indicator is or includes N, N-diethyl-p-phenylene diamine (DPD). Systems and methods utilizing the stabilized indicator composition to determine an amount of at least one constituent in a test sample (e.g., water) are also described. In embodiments, the systems and methods remove the stabilizer from the stabilized indicator composition to produce a fluid flow containing un stabilized indicator, which is then combined with a fluid from a sample source to form a test sample for analysis.

The present invention provides a polyimide film comprising, as polymeric units, dianhydride monomers comprising pyromellitic dianhydride (PMDA), and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the tensile strength and percent elongation of the polyimide film being 180 MPa or greater and 90% or greater, respectively.

The invention discloses a preparation method of high-molecular-weight heterocyclic aromatic polyamide powder, a powder product and application of the high-molecular-weight heterocyclic aromatic polyamide powder. 2-(4-aminophenyl)-5-aminobenzimidazole, p-phenylenediamine and other aromatic diamine monomers which are metered according to a proportion are dissolved in an organic solvent containing a cosolvent, then paraphthaloyl chloride is added, stirring is carried out, and the high-molecular-weight heterocyclic aromatic polyamide powder is obtained. The solid content of the bulk or granular polymer is 6-15%, and the logarithmic viscosity of the obtained polymer can reach more than 8dL / g, and the maximum logarithmic viscosity can reach more than 12dL / g. The heterocyclic aromatic polyamide powder prepared by the method can be dissolved in concentrated sulfuric acid, methanesulfonic acid and other strong acids to prepare a high-viscosity solution, the solution is processed into a high-performance fiber or film material, and large-scale popularization and application of heterocyclic aramid fibers can be realized.

The present invention provides low-dielectric polyamic acid and a polyimide film, the low-dielectric polyamic acid comprising: a dianhydride acid component including two or more selected from the group consisting of biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA), and p-phenylenebis(trimellitate anhydride) (TAHQ); and a diamine component including one or more selected from the group consisting of oxydianiline (ODA), m-tolidine, and paraphenylene diamine (PPD), and the low-dielectric polyamic acid being obtained by copolymerizing the components.

The invention provides a binuclear zinc complex based on a bridged bis (beta-diimine) dianion ligand as well as a preparation method and application of the binuclear zinc complex, and belongs to the technical field of preparation and application of metal organic complexes. Starting from p-phenylenediamine, an aryl bridged bis (beta-diimine) ligand precursor is synthesized through multi-step reactions such as amine methylation, nucleophilic substitution and condensation, the ligand precursor is utilized to react with ZnEt2 or Zn [N (SiMe3) 2] 2 to obtain the binuclear metal zinc complex, and the obtained complex has high catalytic activity on lactide ring-opening polymerization, and can be used for preparing the complex for lactide ring-opening polymerization. The ring opening polymerization of the lactide can be catalyzed to generate the polylactide with high molecular weight and narrow molecular weight distribution in the absence of a cocatalyst.

Combination for Dyeing Keratin Fibers and its Use. The present invention relates to a dye combination comprising: A) a dye composition a), comprising: I) a coloring composition i), comprising: i) at least one oxidizing dye; wherein the oxidizing dye comprises one or more oxidizing bases selected from the group consisting of para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, meta-aminophenols, ortho-aminophenols, and addition salts thereof, and mixtures thereof; and / or wherein the oxidizing dye comprises one or more couplers selected from the group consisting of meta-phenylenediamines, meta-aminophenols, and addition salts thereof, and mixtures thereof; and B) a pyrazolidine-3,5-dione compound of formula (1): (1). Figure for abstract: None

The invention discloses a preparation method of a full-spectrum photothermal conversion eutectic material and application of the full-spectrum photothermal conversion eutectic material in water purification. The preparation method comprises the following steps: mixing an electron donor and an electron acceptor, adding dichloromethane, performing ultrasonic dissolution, adding ethanol, and continuously performing ultrasonic uniform mixing; finally, after the solvent is volatilized at room temperature, crystals are separated out, and the eutectic material is obtained. The electron donor is tetramethyl p-phenylenediamine and / or tetramethyl biphenyl diamine; and the electron acceptor is one or more of tetracyanobenzene, chloranil and tetrabromobenzoquinone. By gradually adjusting the electron donor-acceptor structure, the band gap structure of the eutectic is changed, and the light absorption range of the eutectic is gradually expanded to a near-infrared second region. The eutectic material provided by the invention has photo-thermal conversion performance of a near-infrared first zone and a near-infrared second zone, the highest temperature can reach 178 DEG C, and the photo-thermal conversion efficiency can reach 87.5%. Eutectic is loaded on the non-woven fabric to serve as a heat source, and water evaporation and purification can be achieved through a xenon lamp or sunlight irradiation.

This invention belongs to the field of fine chemical synthesis technology and relates to a method for preparing 2,4-diaminodiphenylamine, an intermediate in p-phenylenediamine antioxidants. Aniline and m-dinitrobenzene undergo a catalytic nucleophilic substitution reaction under negative pressure to obtain a reaction system with 2,4-dinitrodiphenylamine as the main product. The reaction system with 2,4-dinitrodiphenylamine as the main product is diluted with methanol and then subjected to catalytic hydrogenation. After the reaction, post-treatment yields 2,4-diaminodiphenylamine. This invention uses m-dinitrobenzene as the reactant, which is halogen-free and does not produce halogen-containing wastewater. It also has lower requirements for the corrosion resistance of production equipment, higher atom economy, and is more in line with the concept of green chemistry. The solvent and catalyst in this invention are recyclable, resulting in low cost.

The present invention discloses a sequentially arranged polyimide copolymer for a capacitor, its preparation method and application. The preparation method of the polyimide copolymer of the present invention comprises the following steps: Under stirring conditions, a solution of 4,4'-biphenylene ether dianhydride is dropped into a solution of a diamine monomer (one of 2,2-bis(4-aminophenyl)propane, p-phenylenediamine, 4,4'-(1,4-phenylene diisopropylidene)dianiline), and stirring reaction is carried out; the molar ratio of 4,4'-biphenylene ether dianhydride to the diamine monomer is 1:2; hexafluorodiacid anhydride is added to the obtained solution, and stirring reaction is carried out; the obtained solution is dried to evaporate the solvent, heat-treated, and cooled to obtain a sequentially arranged polyimide copolymer for a capacitor. The polyimide copolymer of the present invention has a high glass transition temperature, a high breakdown strength and a high energy storage density, and still has a high charge-discharge efficiency and a low leakage current density at high temperatures, effectively improving the high-temperature performance of the capacitor.

The present invention discloses a regenerated polymer composition comprising: (a) a regenerated polymer blend consisting of (a1) a regenerated polyamide and (a2) a regenerated synthetic fiber material; (b) a block copolymer selected from the group consisting of a functionalized HSBC and a non-functionalized HSBC; and (c) optional additives. The functionalized HSBC includes a functional group selected from the group consisting of maleic anhydride, epoxy, and silane. The regenerated synthetic fiber material includes one or more polymers selected from the group consisting of a polyether-polyurea copolymer, a polyether-polyester copolymer, a polyester-polyurea copolymer, and a polyurea derived from p-phenylene diisocyanate and p-phenylenediamine. The regenerated polymer blend comprises regenerated polyamide and a regenerated synthetic fiber material in a weight ratio of (1: 10)-(10: 1). The regenerated polymer composition exhibits an improved balance of melt flow rate and mechanical properties compared to corresponding compositions that do not contain the block copolymer.

Product containing a dyeing composition comprising a fatty acid, a non-ionic surfactant, a non-associative polymer, at least 10% by weight of one or more fatty substances, a polyol, a specific dye precursor and an oxidizing composition The present invention relates to a product for dyeing human keratinous fibers, such as hair, containing: A) a dyeing composition comprising: a) one or more fatty acids, b) one or more non-ionic surfactants, c) one or more non-associative polymers chosen from amphoteric polymers, cationic polymers and their mixture, d) at least 10% by weight of one or more fatty substances other than fatty acids, relative to the total weight of the composition, e) one or more polyols, f) one or more oxidation bases selected from para-phenylenediamine derivatives of formula (I), their addition salts,their solvates and / or the solvates of their salts: (I) in which R is chosen from: i) a (C1-C4)alkoxy(C1-C4)alkyl radical, ii) a C1-C4 hydroxyalkyl radical; g) optionally, one or more couplers, and B) an oxidizing composition comprising one or more oxidizing agents. Figure for the abstract: none,

The invention relates to a composition comprising at least one oxidation base chosen from 2-β-hydroxyethyl-para-phenylenediamine of formula (I), an addition salt thereof, solvates thereof and / or solvates of the salts thereof, at least one (poly)oxyalkylenated amino silicone and at least one polyol.The invention also relates to a process for dyeing keratin fibers, preferably the hair, which comprises the application of the composition to said keratin fibers.

The present disclosure discloses a double-layer lithium ion sieve fiber material and its preparation method and application, which relate to the field of lithium resource technology. The double-layer lithium ion sieve fiber material includes a core layer and a coating layer, the core layer includes a flexible carrier and a manganese ion sieve dispersed in the flexible carrier, the components of the flexible carrier include soft polyvinyl chloride and hydrophilic polyethersulfone, and a plurality of first holes are constructed on the flexible carrier; the coating layer includes a rigid carrier and a titanium ion sieve dispersed in the rigid carrier, the components of the rigid carrier include poly(p-phenylene terephthalamide) and poly(hexamethylene adipamide), and a plurality of second holes are constructed on the flexible carrier. The double-layer lithium ion sieve fiber material provided by the present disclosure is rigid on the outside and soft on the inside, and has good water pressure resistance and fracture resistance. At the same time, the manganese ion sieve has less dissolution loss, and has excellent cycle performance and lithium ion adsorption performance, and can be widely used in lithium extraction from brine.

This invention provides a multilayer polyimide film with excellent heat resistance, low dielectric loss tangent, and dimensional stability. The multilayer polyimide film comprises a heat-resistant polyimide layer and a heat-fusion polyimide layer laminated on one or both sides; the heat-resistant polyimide is obtained from a tetracarboxylic acid component containing more than 75 mol% of 3,3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA) and less than 25 mol% of pyromellitic dianhydride (PMDA), and a diamine component containing 70 mol% to 95 mol% of p-phenylenediamine and 5 mol% to 30 mol% of 2,2'-dimethylbenzidine; the heat-fusion polyimide is obtained from a tetracarboxylic acid component containing 10 mol% to 60 mol% of s-BPDA and 40 mol% to 90 mol% of PMDA, and a diamine component containing more than 50 mol% of 2,2-bis[4-(4-aminophenoxy)phenyl]propane.

Stabilized indicator compositions, and systems and methods using the same are described. In embodiments the stabilized indicator compositions include a solvent, an indicator, a stabilizer for the indicator, and optionally a buffer. In embodiments the indicator is or includes N,N-diethyl-p-phenylene diamine (DPD). Systems and methods utilizing the stabilized indicator composition to determine an amount of at least one constituent in a test sample (e.g., water) are also described. In embodiments, the systems and methods remove the stabilizer from the stabilized indicator composition to produce a fluid flow containing un stabilized indicator, which is then combined with a fluid from a sample source to form a test sample for analysis.

The invention discloses a color-spun yarn and a preparation method thereof. The method comprises the following steps: 3,3',4,4'-biphenyltetracarboxylic acid dianhydride, p-phenylenediamine and a modified monomer are reacted to form polyamic acid, the polyamic acid is then blended with a modified filler to obtain a spinning solution, the spinning solution is then imidized under high temperature conditions to obtain a reinforced fiber, the reinforced fiber is dyed to obtain a dyed fiber, the dyed fiber is subjected to opening, carding, drawing, roving and spinning processes to obtain a pretreated yarn, the pretreated yarn is soaked in water, taken out and dried to obtain a color-spun yarn, when the pretreated fiber is soaked in water, siloxane on a side chain of a polyimide molecule and siloxane on a surface of the modified filler are hydrolyzed and condensed, so that the bonding degree of adjacent dyed fibers is improved, and the modified monomer is an elastic monomer, the modified monomer contains a cage-type silsesquioxane structure, the cage-type silsesquioxane structure contains a large amount of long-chain alkyl groups, the molecular gap of the polyimide can be increased, and thus the mechanical properties of the material are increased.

The present invention provides a method for preparing highly flame-retardant aramid fiber by intermittent polycondensation of low-temperature solution, characterized in that the method comprises the following steps: (1) dissolving calcium chloride; (2) dissolving p-phenylenediamine; (3) reacting terephthaloyl chloride and p-phenylenediamine; (4) reacting isophthaloyl chloride and p-phenylenediamine; (5) after the reaction is completed, separating the generated polymer, washing and drying to obtain modified poly (p-phenylene terephthalamide); (6) preparing modified aramid fiber. The modified aramid fiber prepared by the present invention has a breaking strength of >20.1 cN·dtex. ‑1 , elongation at break ≥ 10%, limiting oxygen index ≥ 32%. The present invention also provides an aramid fiber prepared by the above method.