38 results about "Naphthol AS" patented technology

The invention provides a liquid red direct dye and a preparation method thereof, and the method comprises the following steps: S1, dispersing 2-amino-5-naphthol-7-sulfonic acid and bis (trichloromethyl) carbonate in water, adjusting the pH value of a reaction system by using a first organic base, and reacting to obtain a scarlet acid aqueous solution; s2, dispersing a sulfo aromatic amine compound and nitrite in water, adjusting the pH value of a reaction system by using inorganic acid, reacting to obtain sulfo aromatic amine diazonium salt precipitate, and performing solid-liquid separation to obtain sulfo aromatic amine diazonium salt; and S3, adding the sulfonic aromatic amine diazonium salt in the step S2 into the scarlet acid aqueous solution in the step S1, adjusting the pH value of the reaction system by using second organic alkali, and reacting to obtain the liquid red direct dye. Through the preparation method, the red direct dye which can stably exist in a liquid form and is suitable for direct use can be obtained.

The invention discloses a preparation method of hexa-naphthyloxy cyclotriphosphazene, which comprises the following steps: adding alkali metal hydroxide into a reaction solvent in which naphthol is dissolved, and reacting at 40-60 DEG C for 20-40 minutes to prevent oxygenolysis so as to prepare an alkali metal naphthol salt solution; the solution is stirred and dropwise added into a reaction solvent containing hexachlorocyclotriphosphazene, the ratio of hexachlorocyclotriphosphazene to the solvent is 1: 20-1: 30, the ratio of naphthol to hexachlorocyclotriphosphazene is larger than or equal to 6: 1, substitution is carried out step by step, after dropwise adding is completed, a reaction is carried out for 12-24 h at the temperature of 80-120 DEG C, and six chlorine atoms are completely substituted by naphthyloxy; filtering reaction liquid, and washing a filter cake with a solvent; and carrying out reduced pressure distillation on the filtrate to recover the solvent, washing the crude product with ethanol to remove an intermediate and an oligomer, washing with water to remove water-soluble impurities, filtering, and drying to finally obtain the high-purity hexa-naphthyloxy cyclotriphosphazene with the melting point of 169 DEG C. According to the method, the high-purity hexa-naphthyloxy cyclotriphosphazene crystal is ensured to be obtained by accurately controlling substitution reaction conditions and a multi-stage purification process.

The application discloses a preparation method of acid and alkali resistant toluidine red pigment, belongs to the technical field of pigment synthesis, and introduces di-primary amine on a modified toluidine red pigment, then reacts with a dicarboxylic compound, and finally is prepared through hydrolysis and self-assembly; the modified toluidine red pigment is prepared through the following steps that 3-amino-4-nitrobenzyl alcohol is diazotized and then coupled with 2-naphthol; the acid and alkali resistant toluidine red pigment prepared by the application not only has bright color and good hiding power, and also has high coloring strength, light resistance, water resistance, oil resistance and dispersibility, and simultaneously has strong acid and alkali resistance and environmental stability, and significantly improves the application performance of the pigment.

The application provides a preparation method of 3-aryl / alkyl-beta-naphthyl ether compounds, and the preparation method comprises the following steps: reacting trimethyl orthoformate with 1,3-diaromatic propyl ketone compounds or 1-aryl-3-alkyl ketone compounds to obtain 3-aryl-beta-naphthyl ether compounds or 3-alkyl-beta-naphthyl ether compounds. The reaction condition of the application is mild, trimethyl orthoformate is cheap and easy to obtain, can be used as a methylation reagent and a carbon source for extending a carbon chain at the same time, the range of reaction substrates is wide, and the functional group tolerance is good; the reaction is efficient, the selectivity is high, the post-treatment is simple, the operation is simple, and the application is suitable for large-scale industrial production; the complex substrate prepared in advance in the traditional reaction is avoided, the metal catalyst necessary for the traditional reaction is not needed, the binaftyl alcohol precursor compounds can be prepared with high chemical selectivity, and a more simple and efficient route is provided for the olefin hydroformylation / hydroformyl esterification reaction for synthesizing bidentate ligands.

The invention discloses an electrochemical sensor for monitoring the glucose content of fish in real time and application of the electrochemical sensor, and belongs to the field of electrochemistry. The sensor comprises a three-electrode system consisting of a working electrode, a reference electrode and a counter electrode, the working electrode takes a platinum-iridium alloy wire as a substrate, the surface of the working electrode is coated with a composite membrane consisting of a carbon nanotube and naphthol, and glucose oxidase is fixed on the composite membrane through physical adsorption and chemical crosslinking. The glucose detection sensitivity of the sensor is higher than 0.215 nA / mmol.L <-1 >, the response speed is high, the stability is good, the anti-interference capability is high, and the sensor has very high correlation with the detection result of a glucometer. According to the invention, real-time in-vivo monitoring of the fish glucose content is realized, and powerful technical support is provided for green and sustainable development of aquaculture.

The purpose of the present invention is to provide: a photochromic compound having an excellent color fading rate and excellent durability; a naphthol derivative that can become an intermediate for the photochromic compound; and a curable composition, an optical article, a lens and eyeglasses each containing the photochromic compound. According to embodiments, a photochromic compound having a backbone represented by formula (1) is provided. In formula (1), M represents C, Si or Ge; R1 represents a haloalkyl group having 1 to 20 carbon atoms inclusive; R2 represents a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms inclusive or a substituted or unsubstituted haloalkyl group having 1 to 20 carbon atoms inclusive.

This invention discloses a composition for removing camphor ball odor from clothing, its preparation method, and its application method. The composition comprises the following components in parts by weight: 4-15 parts polyol, 2-8 parts fatty alcohol polyoxyethylene ether sulfate, 3-9 parts fatty acid, and 0.5-2 parts sodium hydroxide or potassium hydroxide. This invention utilizes the products of the reaction between polyol, fatty alcohol polyoxyethylene ether sulfate, fatty acid, and alkali metal hydroxide to increase the solubility of dichlorobenzene, which then reacts with naphthol in camphor balls, thereby removing dichlorobenzene and naphthol from clothing due to the camphor ball odor. The composition for removing camphor ball odor from clothing of different materials can effectively remove camphor ball odor from clothing, and the removal method is simple.

The method comprises the following steps: purifying an anhydrous sodium sulfite product from crude sodium sulfite and wastewater thereof, evaporating the sodium sulfite wastewater until the wastewater is nearly saturated, re-dissolving the crude sodium sulfite until the concentration is nearly saturated, preserving heat, filtering to remove sodium naphthol organic matters with low solubility, and cooling filtrate with water to separate out sodium sulfite heptahydrate crystals. Performing alkali washing on the sodium sulfite heptahydrate crystal to enable sodium naphthol adsorbed on the surface of the sodium sulfite heptahydrate crystal to be dissolved into alkali washing liquid to obtain pure decolored sodium sulfite heptahydrate crystal, and drying and decoloring the sodium sulfite heptahydrate crystal to obtain high-purity anhydrous sodium sulfite; the alkali washing liquid is returned to the naphthol SO2 absorption acidification process for mechanical application, and sodium naphthol is recovered; the distilled condensate water is used as process water for naphthol production; according to the method, the characteristic that sodium sulfite is subjected to water-cooling salt separation to generate sodium sulfite heptahydrate when the concentration of sodium sulfite is nearly saturated is utilized, the process route for purifying the anhydrous sodium sulfite product is simple and feasible, secondary pollution and emission of three wastes are avoided, and the method belongs to a clean production process with comprehensive utilization of resources and environmental friendliness.

The invention discloses a naphthol glycoside compound separated from cortex juglandis mandshuricae as well as a preparation method and application of the naphthol glycoside compound. The preparation method of the naphthol glycoside compound comprises the following main preparation steps: by taking cortex juglandis mandshuricae as a raw material, carrying out reflux extraction with 60% ethanol, extracting with solvents with different polarities, separating an n-butyl alcohol layer, purifying and enriching by adopting macroporous resin, and purifying by combining reversed-phase column chromatography separation with HPLC (High Performance Liquid Chromatography) chromatography, thereby obtaining the naphthol glycoside compound. The purity and the yield of the obtained compound are relatively high. An in-vitro antifungal activity experiment shows that the naphthol glycoside compound prepared by the invention has remarkable inhibitory activity on pathogenic fungi, is a high-quality antifungal active substance from a natural product, and has an application prospect of being developed into an antifungal drug.

The application provides a flexible wearable sensor and a preparation method and a quercetin determination method, relates to the field of quercetin detection, and comprises the following steps: performing laser etching on a to-be-processed mold according to a preset pattern to form a to-be-covered mold; covering the to-be-covered mold with polydimethylsiloxane, performing curing treatment on the to-be-covered mold, obtaining a cured mold, stripping the polydimethylsiloxane film of the cured mold, obtaining a to-be-packaged electrode, coating polydimethylsiloxane to the fourth protruding part; coating silver paste to the third protruding part, heating until curing, and obtaining a cured electrode; immersing the cured electrode into a tetrachloroauric acid solution, depositing gold nanoparticles on the surface of the cured electrode, dropping a mixed solution of black phosphorus solution and naphthol on the first protruding part, and obtaining a flexible wearable sensor after drying. The application has high detection result accuracy and low test cost, and provides accurate judgment basis for the normal growth and development of plants.

This invention discloses an age-resistant photochromic dye and its preparation method, belonging to the fields of fine chemical synthesis and optical functional materials technology. In this invention, naphthalene ketone is reacted with succinate and acetic anhydride to generate a hyperconjugated naphthol derivative. The naphthol derivative then reacts with the aforementioned hydroxyl-functionalized diarylkynyl alcohol to generate a hyperconjugated naphthopyran compound. This synthetic process is easy to operate. Furthermore, the obtained hyperconjugated naphthopyran compound exhibits a rapid fading rate and good age resistance, making it suitable for applications in photochromic lenses, textiles, anti-counterfeiting, coatings, and other fields.

The invention discloses a water-resistant room-temperature phosphorescent material with long service life and high quantum yield and application thereof, and the material is obtained by doping a binaphthol-containing functionalized phosphor monomer into a polymer matrix polyvinyl alcohol and then carrying out iodine dyeing-stretching-crosslinking (ISB). Through the heavy atom effect of iodine, the crossing of phosphorescence systems is enhanced, and the molecular structure rigidity is enhanced through boric acid crosslinking, so that long-life room-temperature phosphorescence emission from nothing to existence and from weak to strong is realized; the phosphorescence lifetime is increased by 28.4 times, and the phosphorescence quantum yield is increased by 24.1 times. The preparation method is simple to operate and low in production cost, has good universality, provides a new strategy for designing a long-life room-temperature phosphorescent material, and has good application prospects in the fields of antibiosis, water resistance, multicolor display, information encryption and the like.

The invention relates to the technical field of pesticide detection, in particular to an organic photoelectrochemical transistor for detecting organic pesticide and a preparation method and application of the organic photoelectrochemical transistor. The preparation method comprises the following steps: dissolving thioacetamide in a bimetallic salt precursor solution, and carrying out a hydrothermal reaction to obtain an indium-based bimetallic sulfide heterojunction CdS / CdIn2S4; dispersing a naphthol solution and the indium-based bimetallic sulfide heterojunction CdS / CdIn2S4 in deionized water to obtain a turbid liquid, coating the surface of ITO conductive glass with the turbid liquid, and drying to obtain a grating electrode CdS / CdIn2S4-ITO; a chitosan solution is dispensed on the surface of the grating electrode CdS / CdIn2S4-ITO, and after drying, a grating electrode CS / CdS / CdIn2S4-ITO is obtained; a glutaraldehyde solution is dispensed on the surface of the grating electrode CS / CdS / CdIn2S4-ITO, and the grating electrode CS / GA / CdS / CdIn2S4-ITO is obtained after the grating electrode CS / CdS / CdIn2S4-ITO is dried; and dispensing a diazinon aptamer solution on the surface of the grating electrode CS / GA / CdS / CdIn2S4-ITO, and incubating at room temperature to obtain the electrode sensor Apt / CS / GA / CdS / CdIn2S4-ITO. The OPECT has the characteristics of high sensitivity, easiness in integration, portability, low cost and miniaturization.

The application relates to an indium-doped copper oxide electrode for electrocatalytic reduction of CO2 and a preparation method thereof, and belongs to the technical field of electrocatalytic reduction. Copper chloride and indium nitrate are used as raw materials, sodium hydroxide is used as a precipitant, a precursor is obtained through co-precipitation, the precursor is decomposed through heating, centrifugal washing and vacuum drying, and an indium-doped copper oxide catalyst is obtained, ink is prepared by mixing water, ethanol and a naphthol solution, the ink is uniformly coated on carbon paper and dried to obtain the indium-doped copper oxide electrode. The prepared indium-doped copper oxide electrode has high catalytic activity and good stability, indium atoms are doped in the copper oxide crystal lattice, the kinetics of the catalyst is improved, the desorption of carbon monoxide from the surface is accelerated, the doping of indium can improve the stability of the catalyst and inhibit the generation of hydrogen, a competitive product. The operation process is simple, raw materials are easy to obtain, no pollution is caused, no expensive equipment is needed, and the application has a wide application prospect.

The present invention provides a toner for developing electrostatic latent images and a method for manufacturing the toner for developing electrostatic latent images. The toner contains a binder resin which contains an amorphous polyester resin A, and a colorant. The amorphous polyester resin A is a polycondensate of an alcohol component, a carboxylic acid component, and polyethylene terephthalate. The colorant contains a naphthol AS-based pigment. The manufacturing method includes a step for melt-kneading at least the binder resin and the colorant, and a step for pulverizing a kneaded substance resulting from the previous step. The toner for developing electrostatic latent images according to the present invention is suitable for developing latent images and the like formed in electrophotography, electrostatic recording, electrostatic printing, or the like.

Photochromic polyamide materials, their precursors, preparation methods, photoinitiators, and applications are disclosed. The precursors for photochromic materials are described, which are used to prepare photochromic polyamide materials. This process involves mixing the precursor with multifunctional hydrocarbon groups or their derivatives to obtain the photochromic material. Specific functional hydrocarbon groups can be selected for mixing to enhance the performance of the photochromic material. By introducing photochromic units into the polyamide structure, the material can quickly respond to ultraviolet light and return to a colorless state, maintaining excellent photochromic effects. Simultaneously, the polyamide matrix significantly enhances the material's mechanical strength, wear resistance, and environmental adaptability, giving it long-term stable color-changing properties. This makes it suitable for various fields such as smart coatings and optical devices. This solution addresses the technical problems of existing naphthol-pyran-based photochromic materials in terms of photoresponse, mechanical properties, and chemical stability.

This invention relates to the field of polyurethane elastomer technology, and discloses a high-temperature resistant polyurethane elastomer material and its preparation process. The 2,4,6-tri-(4-bromophenyl)-[1,3,5]triazine obtained by reacting 2,4,6-tri-(nitronaphthyl-phenyl)-[1,3,5]triazine with 4-nitro-1-naphthol exhibits excellent heat resistance. The aromatic naphthalene ring structure has a rigid structure and its molecular chain is highly regular, resulting in polyurethane elastomers synthesized from it exhibiting excellent dynamic properties. A chain extender containing diamine is prepared using the reduced 2,4,6-tri-(aminonaphthyl-phenyl)-[1,3,5]triazine, which reacts with isocyanate to form urea groups, thereby improving the tensile strength of the polyurethane elastomer. The synergistic effect of the triazine, naphthalene ring, and hydrogen bonds results in a polyurethane elastomer with excellent mechanical properties and significant high-temperature resistance.

The invention relates to the technical field of environmental functional materials and pollution control, in particular to preparation of a Fe-Fe3C nitrogen-doped porous carbon composite material loaded with BiOBr nanosheets and application of the Fe-Fe3C nitrogen-doped porous carbon composite material as a high-efficiency photocatalyst. The preparation method is characterized in that NH2-MIL-101 (Fe) which is prepared by an improved process and has an octahedral structure with a specific size is used as a precursor, and nitrogen-doped porous carbon which retains a complete octahedral configuration and wraps magnetic Fe-Fe3C nanoparticles is obtained through high-temperature carbonization; a proper amount of BiOBr nanosheets are further introduced, and the BiOBr nanosheets and the BiOBr nanosheets are tightly combined to construct the composite photocatalytic material with sufficient S-shaped heterojunctions. According to the present invention, with the special carbonized carrier and the efficient heterojunction, the excellent and stable synergistic adsorption and photocatalytic degradation performance on beta-naphthol and catechol can be provided under the simulated sunlight, the total removal rates can respectively achieve 98.1% and 100.0%, the mineralization rate is high, the rate is fast, and the generation of the secondary pollutants is substantially avoided; in addition, the material has magnetism, can be quickly separated and recycled by virtue of an external magnetic field, and shows a good practical application prospect.

Disclosed are wash resistant compositions for altering the tone or color of the hair, the compositions comprising a hair coloring agent comprising an oxidation base chosen from toluene-2,5-diamine, acid salts thereof, or solvates thereof, and a coupler system comprising at least one coupler chosen from 1-napthol, 2-amino-4-hydroxyethylaminoanisole sulfate, and derivatives thereof, addition salts thereof, solvates thereof, or solvates of salts thereof; or mixtures thereof, as well as methods of using the compositions.

The application belongs to the field of electrode materials, and particularly relates to a preparation method and application of a copper-based electrode material. After cleaning, the foamed copper is placed in a mixed solution of sodium hydroxide and hydrogen peroxide for stirring and reaction, and is cleaned and vacuum dried to obtain foamed copper loaded with copper hydroxide on the surface. The cobalt salt and conductive carbon black are placed in a mixed solution of isopropyl alcohol and naphthol, and are ultrasonically dispersed to obtain a suspension. The suspension is coated on the surface of the foamed copper loaded with copper hydroxide on the surface, and is vacuum dried, and is placed in an electrolyte for reduction reaction, and is washed and dried to obtain the copper-based electrode material. The method does not involve high-temperature treatment, the preparation of copper hydroxide is realized by controlling the proportion of hydrogen peroxide and sodium hydroxide, and when cobalt is introduced by electrochemical reduction, a carbon protective shell is simultaneously formed, so that the efficiency and stability of the nitrate reduction cathode are greatly improved.

This invention relates to a pH-responsive polyurethane nanomaterial, a drug delivery system, and a preparation method, comprising the following steps: S1, synthesizing a naphthyl polyurethane using isocyanate and naphthol as raw materials in an organic solvent containing a catalyst, then adding a capping agent and undergoing a capping reaction to obtain a capped naphthyl polyurethane; S2, adding phenylboronic acid and an initiator to the capped naphthyl polyurethane, and obtaining a phenylboronic acid-naphthyl polyurethane polymer via free radical polymerization; S3, reacting the phenylboronic acid-naphthyl polyurethane polymer with tannic acid to obtain the pH-responsive polyurethane nanomaterial. The hydrophobic core of this invention's pH-responsive polyurethane nanomaterial is a polyurethane terminally grafted with phenylboronic acid, while the hydrophilic end is tannic acid with polyphenolic hydroxyl groups, increasing pH responsiveness and effectively increasing drug loading rate. It exhibits good biocompatibility and antitumor effects, while also possessing certain antioxidant and antibacterial capabilities.

This invention relates to a photosensitizer-modified high-efficiency and stable quantum dot light-emitting diode (QLED) and its preparation method, belonging to the field of optoelectronic display technology. The QLED incorporates the photosensitizer 1-diazo-2-naphthol-4-sulfonic acid (DNS) in its hole injection layer, quantum dot emitting layer, and electron transport layer, and a DNS-modified layer can be formed on the ITO anode surface. The preparation method involves sequentially depositing the aforementioned DNS-doped functional layers using a solution method, followed by a one-step ultraviolet light irradiation treatment to trigger photocrosslinking reactions of DNS at each interface. This invention utilizes a single photosensitizing molecule to simultaneously achieve multiple synergistic optimizations, including enhanced hole injection, protection of the emitting layer from solvent erosion, passivation of electron transport layer defects, and stabilization of the electrode interface, thereby significantly improving the luminous efficiency and operational stability of the QLED. The method is simple and has good compatibility with existing solution processing techniques.

This invention relates to a toner for developing electrostatic images that exhibits excellent charge stability under high temperature and high humidity conditions, and to a method for manufacturing the same. [Solution] A toner for developing electrostatic images containing an amorphous polyester resin A and a colorant, wherein the amorphous polyester resin A is a polycondensate of an alcohol component, a carboxylic acid component, and polyethylene terephthalate, and the colorant contains a naphthol AS-based pigment; and a method for producing the toner for developing electrostatic images, comprising the steps of melting and kneading at least the binder resin and the colorant, and grinding the kneaded product obtained in the step.

The invention discloses a large-scale production and inactivation process for foot and mouth disease viruses. After standardization of an inactivator cyclization method is established, storage time and temperature of the inactivator are optimized, toxicity test of 50% Na2S2O3 on BHK-21 cells and dosage optimization of inactivated 50% Na2S2O3 in mass production are carried out, and different foot-and-mouth disease virus strains TCID50 and inactivation kinetics curves are established, the method is applied to large-scale production. After cyclization of the inactivator, whether BEA cyclization succeeds or not is judged by detecting pH and color change of a beta-naphthol purple indicator, thorough inactivation of venom is further ensured, biological safety is improved, meanwhile, it is determined that the inactivator can be stored at the temperature of 2-8 DEG C, and the storage life is smaller than or equal to 14 d; 50% of Na2S2O3 is not added after venom inactivation is finished, so that side reactions after vaccination are reduced, the safety of vaccination is improved, and the production cost of the vaccine is reduced; the inactivation process can be accurately controlled, the inactivation efficiency can be improved, the complete inactivation of viruses can be ensured, the biological safety risk in vaccine production can be avoided, the inactivation time can be shortened, and the production cycle can be shortened by drawing the inactivation power curve of different strains.

The present application relates to the technical field of preparation of ore-dressing reagent, in particular to a preparation method of arsenopyrite combined inhibitor; in the present application, the three-dimensional network structure formed by gallic tannic acid on the surface of porous adsorption base material and in the internal pore structure thereof can effectively envelop and fix the synergistic inhibitor adsorbed on the surface of the porous adsorption base material and in the internal porous structure thereof, so that the finally prepared arsenopyrite combined inhibitor has good arsenic inhibition effect under the synergistic cooperation of gallic tannic acid and the synergistic inhibitor. Furthermore, under the mutual synergistic cooperation of aniline black and naphthol blue black, the arsenic inhibition effect thereof is effectively improved; the arsenopyrite combined inhibitor prepared by using the present application is used for flotation separation of sulfararsenide minerals, so that the quality and grade of the obtained minerals after flotation separation are ensured, and the comprehensive utilization of mineral resources is improved. In addition, the porous adsorption base material prepared by using the present application has certain magnetism, so that it is convenient for subsequent recovery, and is relatively energy-saving and environment-friendly.

The purpose of the present invention is to provide: a photochromic compound having excellent temperature dependence and fading speed; a naphthol derivative that can be used as an intermediate of the photochromic compound; a curable composition containing the photochromic compound; an optical article; according to one embodiment, a photochromic compound having a skeleton represented by formula (1) is provided. In formula (1), M is C, Si or Ge. Ring A is a substituted or unsubstituted aromatic ring, a substituted or unsubstituted aromatic heterocyclic ring, or a substituted or unsubstituted fused polyring in which an aromatic ring or an aromatic heterocyclic ring is fused to these rings. Z1 represents a group represented by formula (1a) or a group represented by formula (1b).

The purpose of the present invention is to provide: a photochromic compound having excellent temperature dependency and an excellent color fading speed; a naphthol derivative that can be an intermediate for the photochromic compound; and a curable composition, an optical article, a lens, and an eyeglass each including the photochromic compound. An embodiment of the present invention provides a photochromic compound having a skeleton represented by formula (1). In formula (1), M is C, Si, or Ge. Ring A is a substituted or unsubstituted aromatic ring, a substituted or unsubstituted aromatic heterocyclic ring, or a substituted or unsubstituted condensed polycyclic ring in which an aromatic ring or an aromatic heterocyclic ring and the substituted or unsubstituted aromatic ring or the substituted or unsubstituted aromatic heterocyclic ring are condensed. Z1 is a group represented by formula (1a) or a group represented by formula (1b).

The purpose of the present disclosure is to provide: a photochromic compound that is superior in terms of the temperature dependence and the color fading rate; a naphthol derivative that could be an intermediate for the photochromic compound; and a curable composition, an optical article, a lens, and eyeglasses each including the photochromic compound. An embodiment of the present invention provides a photochromic compound having a skeleton represented by formula (1). In formula (1), M is C, Si, or Ge. Ring A is a substituted or unsubstituted aromatic ring, a substituted or unsubstituted aromatic heterocyclic ring, or a substituted or unsubstituted condensed polycyclic ring in which an aromatic ring or an aromatic heterocyclic ring is fused on the substituted or unsubstituted aromatic ring or the substituted or unsubstituted aromatic heterocyclic ring. Z1 is a group represented by formula (1a) or a group represented by formula (1b).

The invention discloses a preparation method of an acid and alkali resistant toluidine red pigment, and belongs to the technical field of pigment synthesis, diprimary amine is introduced to a modified toluidine red pigment, then the modified toluidine red pigment reacts with a dicarboxylic acid compound, and finally the acid and alkali resistant toluidine red pigment is prepared through hydrolysis and self-assembly. The modified toluidine red pigment is prepared by diazotizing 3-amino-4-nitrobenzyl alcohol and then coupling the diazotized 3-amino-4-nitrobenzyl alcohol with 2-naphthol; the acid and alkali resistant toluidine red pigment prepared by the invention not only has bright color, good covering power, higher coloring strength, light resistance, water resistance, oil resistance and dispersity, but also has higher acid and alkali resistance and environmental stability, and the application performance of the pigment is remarkably improved.

The invention discloses a bifunctional catalyst for PBAT synthesis and a preparation method thereof, and belongs to the technical field of polyester catalysts. Aiming at the problems of poor hydrolytic stability, low activity and high-temperature discoloration of a polyester catalyst, naphthol sulfonate reacts with a metal compound to generate naphthol metal salt-sulfonate, and then deprotection treatment is performed to prepare the bifunctional naphthol metal salt-sulfonate compound with high stability and activity. According to the catalyst, metal ions are taken as an active center, and a large-volume naphthol group is used for replacing a traditional alkoxy chain, so that the hydrolysis resistance of the catalyst is remarkably improved; the conjugation effect of a naphthalene ring in the naphthalene sulfonic acid structure further enhances the thermal stability of the catalyst; sulfonic acid groups in naphthol molecules and metal ions form a synergistic catalysis system, and the catalytic activity is improved. The PBAT material catalytically synthesized by using the catalyst disclosed by the invention has the advantages that the molecular weight is obviously increased, the chromaticity performance is excellent, the chain segment sequence is controllable, and the industrial production is completely met.