30 results about "3-hydroxy-2-naphthoic acid" patented technology

The invention discloses a synthetic method of paratonere 57:1, which comprises the steps of coupling diazo salt of 4-aminotoluene-3-sulfonic acid with solution of 3-hydroxy-2 naphthalenecarboxylic acid sodium salt, and using an inorganic calcium compound as a color lake for preparing the paratonere 57:1. The synthetic method adopts the solution of the 3-hydroxy-2 naphthalenecarboxylic acid sodium salt for carrying out coupling reaction and can solve adverse factors of packaging, transportation, storage and artificial feeding caused by adopting solid 3-hydroxy-2 naphthalenecarboxylic acid in the prior art and reduce the environmental impacts and hazard caused by exposure; as the solution of the 3-hydroxy-2 naphthalenecarboxylic acid sodium salt is liquid, and the liquid has solubility and uniformity, the synthetic method can better accurately determine the actual content of the 3-hydroxy-2 naphthalenecarboxylic acid; and the synthetic method can lead the whole production process to realize no emission of waste solution, save processing cost and save production cost.

An industrial production method for a red with small precipitation on a machine surface and a method for detecting precipitation on a machine surface and belong to the technical field of pigment synthesis and detection. Amino chlorotoluene sulfonic acid sodium salt is subjected to acidification to obtain a turbid liquid; a sodium nitrite water solution is added to achieve diazotization so as to obtain a diazotized solution; the diazotized solution and 3-Hydroxy-2-naphthoic acid are subjected to coupled reaction with existence of a dispersant, and the obtained product is laked to obtain a red. Before laking, the dispersant is added to coat the pigment so as to obstruct growth of the pigment crystal form, the dispersity is improved, the applicability of the machine surface precipitation during application of the blue-ray red to plastics is remarkably improved, and the economic benefits are improved; the reaction conditions are mild, the requirements on equipment are low, and the reaction time is short; the dispersant is relatively common, the application difficulty of a modifier is relatively low, the performance of the obtained blue-ray red is good, the heat resistance can reach 220-230 DEG C, and the transference resistance is of 4 grade.

The invention discloses an industrialized production method of a transference-resistant blue light red pigment for PU (Poly Urethane) and belongs to the technical field of fine chemical synthesis. The industrialized production method comprises the following steps of: by taking 2-chlorine-4-amino toluene-5-sulfonic acid and 3-hydroxy-2-naphthoic acid as main raw materials, and then salifying, diazotizing, coupling and carrying out a lake reaction, and subsequently, filtering and drying at 70-120DEG C to acquire the transference-resistant blue light red pigment for the PU. By adding a mixed lake salt compound into the blue light red pigment, the lake reaction efficiency is improved, the colored light of the blue pigment red is improved, the growth of the original crystal form is facilitated and the heat resistance property is improved; a modifier is added in after-treatment, so that the transference resistance application property of the blue light pigment red in the application of the PU is improved; the reaction condition is warm; the demand in equipment is low; and the acquired product blue pigment red has the advantages of good property, transference resistance reaching level 4 and above, acid resistance reaching level 4 and above, alkali resistance reaching level 4 and above, weather fastness reaching level 5 and above, heat resistance reaching higher than 220 DEG C, so that the popularization and the application are facilitated.

The invention provides an organic photochromic material based on diarylethene, and a preparation method and an application thereof in ion regulation and molecular recognition. A structural formula ofthe material is shown as a general formula I, wherein X is selected from a halogen atom (Cl, Br, I), H, a C1-C12 alkyl group, or a phenyl group. The preparation method of the material includes the following steps: reacting a diarylethene-based monoaldehyde compound having the photochromic performance with 3-hydroxy-2-naphthoic acid hydrazide at the temperature of 20-120 DEG C for about 1-24 hours,forming precipitation in a solution and after the reaction is stopped, and subjecting the precipitate to filtration, washing, and purification to obtain a novel Schiff base photochromic compound based on the diarylethene. The ion regulation switching spectral properties and ion recognition properties of the organic photochromic material of the invention have very important functions in the fieldof photoelectric information, such as preparation of multi-addressing photoelectric molecular switches, molecular conducting wire components, photochromic light-emitting devices, and the like.

The invention discloses a method for synthesizing 1,2-disubstituted benzimidazole compounds from 3-hydroxy-2-naphthoic acid assisted with titanocene dichloride. According to the method, o-phenylenediamine and aldehyde are used as raw materials, ethanol or methanol is used as a solvent, titanocene dichloride is used as a catalyst assisted with 3-hydroxy-2-naphthoic acid, and the 1,2-disubstituted benzimidazole compounds can be synthesized efficiently and selectively. The method provided by the invention is simple to operate, less in catalyst dosage, high in atomic economy, mild in reaction condition, short in reaction time, high in product yield, environmentally friendly, and excellent in selectivity for reaction products, and has broad application prospects for the synthesis of the 1,2-disubstituted benzimidazole compounds.

The embodiment of the invention discloses a 3-hydroxy-2-naphthoic acid/1-perfluorooctane sulfonate/LYH complex and a synthetic method thereof. The 3-hydroxy-2-naphthoic acid/1-perfluorooctane sulfonate/LYH complex has the following chemical formula: Y(OH)2.5(Cl1H7O3)xC8H17O3S)y.zH2O, wherein x is equal to 0.07 to 0.13, y is equal to 0.36 to 0.37, and z is equal to 1 to 2. The synthetic method comprises the following steps: combining NO3-LYH with deprotonated 3-hydroxy-2-naphthoic acid (namely 3-hydroxy-2-naphthoate ion) and 1-octanesulfonate ion, so as to obtain the 3-hydroxy-2-naphthoic acid/1-perfluorooctane sulfonate/LYH complex. The fluorescence emission intensity of the complex is obviously higher than that of 3-hydroxy-2-naphthoic acid sodium salt, so that the detection limit in the process of detecting 3-hydroxy-2-naphthoic acid by adopting fluorescent spectrometry can be reduced.

The invention provides an automatic azo dye production process. The automatic azo dye production process comprises the steps that (1) ammonia water is added to a diazo kettle, 2B acid is poured in, then the temperature is cooled down to below 0 DEG C by adding ice, 30% of hydrochloric acid is added, and an aqueous solution of sodium nitrite with a mass percent of 30% is added; an aqueous solutionof CaCl2 is added; (2) water is added in a dissolution vessel, and 30% of an aqueous solution of sodium hydroxide is added; and 3-hydroxy-2-naphthoic acid is poured in; (3) water is added to a rosin kettle, 30% of an aqueous solution of sodium hydroxide is added, and rosin is added; and (4) a 2B acid diazo solution after diazo is added to a coupling kettle to carry out the reaction. The product prepared by the automatic azo dye production process is higher in purity and does not require additives such as a super dispersant, and the production cost is lower.