16 results about "Benzidine" patented technology

This invention discloses a gravure printing ink composition and its preparation method. The ink, by weight, comprises: 15-35 parts chlorinated polypropylene, 10-20 parts EVA-40W, 4-8 parts rosin-modified resin, 0.3-0.8 parts polyketide resin, 0.1-0.3 parts chlorinated ether resin MP45, 0.3-0.8 parts silica, 0.05-0.15 parts antistatic agent, 0.2-0.5 parts dispersant, 0.1-0.3 parts modified aluminum silicate AM660, 8-12 parts benzidine yellow, 6-10 parts fast red BHXL-T, 3-5 parts permanent orange yellow No. 13, 3-7 parts calcium powder, and 30-50 parts mixed solvent. During preparation, each resin is pre-dissolved separately, then mixed with pigments, additives, etc., and ground to a fineness ≤15μm. The ink of this invention has bright colors, good light resistance, excellent adhesion, antistatic properties, and printability, and is particularly suitable for gravure printing on polyolefin films.

The invention discloses a bimetallic-Salen photocatalyst based on an isomerism effect as well as a preparation method and application of the bimetallic-Salen photocatalyst. The catalyst is synthesized through a solvothermal method, a diamine compound (such as 3, 3 '-diaminobenzidine or 1, 2-diaminobenzene) and a polyaldehyde compound (such as 2, 6-diformyl phenol or 3, 3', 5, 5 '-tetraformyl-4, 4'-biphenol) are used as organic ligands, a plurality of metal acetates (including Sc, In, Zn, Cu and the like) are used as metal sources, and the catalyst is synthesized through a solvothermal method. And the bimetallic-Salen isomer with a one-dimensional chain structure is prepared under a mild condition. The obtained material can form two isomers with zigzag (Z type) and linear (L type) structures according to different coordination orientations. The concept of'coordination oriented isomerization 'provided by the invention realizes accurate regulation and control of photoelectric properties on the molecular level, and provides a new theory and technical route for designing a multi-metal synergistic efficient artificial photosynthesis system. The catalyst material provided by the invention has wide application prospects in the fields of photocatalytic oxygen production, green oxidation reaction, sustainable energy conversion and the like.

This invention belongs to the field of liquid crystal displays and discloses a liquid crystal alignment agent for forming liquid crystal alignment films and a liquid crystal display element. The aim is to provide a liquid crystal alignment agent that, when using negative liquid crystals, can achieve photoalignment films with excellent light spots and image retention characteristics. Furthermore, the alignment agent exhibits excellent viscosity stability during storage, while simultaneously protecting the liquid crystal alignment film obtained from this alignment agent and the liquid crystal display element containing this film. This invention utilizes a modified benzidine reacted with a tetracarboxylic acid dianhydride containing a cyclobutane structure to prepare a polyamic acid coating solution. The resulting photoalignment agent exhibits good storage stability, high compatibility with negative liquid crystal materials, avoids bright spot defects, and possesses excellent image retention characteristics. It can be applied to FFS-driven liquid crystal display elements and other applications requiring high display quality.

The invention discloses a DAB immune color development kit capable of enhancing color development performance and product stability and application of the DAB immune color development kit, and relates to the technical field of immunohistochemical staining. The DAB immune chromogenic kit provided by the invention comprises a DAB A solution, a DAB B solution and a DAB enhancer, the DAB A liquid comprises hydrochloric acid, 3, 3 '-diaminobenzidine and a specific polymer component; the DAB solution B comprises hydrogen peroxide, disodium ethylene diamine tetraacetate, tris (hydroxymethyl) aminomethane, hydrochloric acid and imidazole. A specific polymer component is introduced to form a compound with DAB, so that the rigidity of a precipitation product is remarkably enhanced, the problems of deformation and collapse caused by water loss in a dry sealing process are effectively solved, and the morphological characteristics of cell nucleuses are completely maintained. By optimizing the pH ratio system of the solution A and the solution B, the sensitivity and the dyeing strength of the chromogenic reaction are optimized, and the chromogenic strength and the sensitivity are further improved in cooperation with the copper sulfate enhancer. The kit is particularly suitable for nuclear antigen labeling items such as Ki-67 and the like, and is suitable for manual and automatic platforms.

The invention provides a synthesis method of a chiral-axis-containing central chiral aza-seven-membered bridged biaryl compound, which comprises the following steps: under the action of a palladium catalyst, a chiral assistant and an additive, firstly carrying out a carbon-hydrogen bond activation reaction on a benzidine compound under the action of the palladium catalyst, and then reacting with 1, 3-dichlorobenzidine to obtain a chiral-axis-containing central chiral aza-seven-membered bridged biaryl compound. The method comprises the following steps: carrying out asymmetric [5 + 2] cyclization reaction on 1, 3-conjugated diene to obtain a central chiral bridged biaryl compound containing a chiral axis; according to the invention, a palladium-catalyzed asymmetric carbon-hydrogen bond activation / [5 + 2] cyclization method is adopted, so that a new way is provided for synthesizing a chiral seven-membered bridged biaryl structure with fewer reports; sulfoxide oxazoline containing a double chiral source is used as a chiral auxiliary agent, and a single axial product with high diastereoselectivity is obtained in a chiral transfer manner through reaction; the substrate applicability is wide, and a series of central chiral seven-membered bridged biaryl compounds containing chiral shafts are synthesized in a high-yield and high-enantioselectivity manner; the synthesis method is efficient and high in atom economy.

The application provides an anion exchange membrane with high hydroxyl ion conductivity and a preparation method. The anion exchange membrane base film after pre-treatment by soaking in deionized water is immersed in an aqueous phase solution, 3,3'-diamino benzidine is fully adsorbed, a rubber roller is used to remove the surface solution, and then the base film is immersed in an organic phase solution for interfacial polymerization reaction, so that the 3,3'-diamino benzidine adsorbed on the surface of the anion exchange membrane base film fully contacts with p-xylene dicarboxaldehyde in the organic phase solution and polymerization reaction occurs at the interface of the two phases to form a separation layer, then drying and solidification are carried out to improve the compactness and stability, and then the base film is treated by alkali doping to obtain the anion exchange membrane with high hydroxyl ion conductivity. The application significantly shortens the ion transmission path and improves the ion conductivity.

The present invention relates to: a polyimide which comprises a diamine component and a tetracarboxylic acid dianhydride component; and a benzidine derivative which can be used as a monomer component for the polyimide. The polyimide may be a polyamide-imide which has an amide structural unit that is formed by bonding of the diamine component and a polybasic acid component. The polyimide contains, as the diamine component, a benzidine derivative in which at least one hydrogen atom on the two benzene rings of benzidine is substituted with a difluoromethyl group.

The present application relates to a kind of stable high-efficiency HRP enzymatic green display dye and its preparation method, belong to the field of immunoassay technology, including A liquid and B liquid, A liquid includes ammonium molybdate, polyethyleneimine, alginic acid, sodium pyrophosphate, H2O2 and PB buffer solution;B liquid includes N, N-dimethylformamide, ethylene glycol, N-methyl pyrrolidone, 3, 3', 5, 5'-tetramethyl benzidine hydrochloride hydrate and ethylenediaminetetraacetic acid disodium, when using, A liquid and B liquid are mixed, and green display dye mixed solution is formed.The substrate dye of the present application can form high contrast with brown in double staining, and the sensitivity is high, the staining on quality and membrane positioning is clear and accurate, and also can make long-term, stable preservation of staining result, meet the pathological diagnosis demand of immunohistochemical double staining.

The present invention provides an optical film comprising a polymer resin, which comprises a first repeating unit, a second repeating unit, a third repeating unit and a fourth repeating unit, wherein the optical index of the film is 1.0% / GU or more, the first repeating unit is an imide repeating unit derived from a first diamine-based compound and a dianhydride-based compound, the second repeating unit is an imide-repeating unit derived from a second diamine-based compound and a dianhydride-based compound, the third repeating unit is an amide-repeating unit derived from a first diamine-based compound and a dicarbonyl-based compound, the fourth repeating unit is an amide-repeating unit derived from a second diamine-based compound and a dicarbonyl-based compound, the first diamine-based compound is 2,2′-bis(trifluoromethyl)benzidine (TFDB), the second diamine-based compound includes an aromatic diamine-based compound, and the third repeating unit and the fourth repeating unit are included in a proportion of 80% or more with respect to the total number of the repeating units comprising the first to fourth repeating units.

The invention discloses a synthesis method of 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-biphenyl dianhydride, which comprises the following steps: by taking 3-nitro-4-methylbenzotrifluoride as an initial raw material, firstly carrying out hydrogenation coupling to obtain a first intermediate 2, 2'-dimethyl-5, 5 '-bis (trifluoromethyl) hydrogenated azobenzene, then carrying out transposition rearrangement to obtain a second intermediate 2, 2'-bis (trifluoromethyl)-5, 5 '-dimethyl benzidine, and then carrying out condensation reaction to obtain 2, 2'-bis (trifluoromethyl)-4, 4 ', 5, 5'-biphenyl dianhydride, thereby obtaining the 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-biphenyl dianhydride. The preparation method comprises the following steps: reacting 2, 2 '-bis (trifluoromethyl)-4, 4', 5, 5 '-dimethyl biphenyl dinitrile to obtain a third intermediate 2, 2'-bis (trifluoromethyl)-5, 5 '-dimethyl biphenyl dinitrile, and carrying out hydrolysis, oxidation and anhydride formation to obtain 2, 2'-bis (trifluoromethyl)-4, 4 ', 5, 5'-biphenyl dianhydride. The synthesis method provided by the invention has the advantages of cheap and easily available initial raw materials, no need of using expensive iodine reagent and butyl lithium, low production cost, mild reaction conditions, low energy consumption, environmental friendliness and high total yield, and is suitable for large-scale industrial production.

The invention relates to the technical field of chemical synthesis, in particular to a synthetic method of benzidine, which comprises the following steps: adding p-bromoaniline, formic acid and hydrazine hydrate into a 10% sodium hydroxide aqueous solution, and heating and reacting at 70-90 DEG C for 6-10 hours under the catalysis of palladium-carbon; after the reaction is finished, filtering, dissolving the obtained filter cake with ethanol, and extracting the obtained filtrate with dichloromethane; combining the dichloromethane extracting solution and the ethanol dissolving solution, carrying out vacuum concentration until the solution is nearly dry, adding deionized water to separate out a target compound, filtering again, and drying a filter cake to obtain benzidine; by optimizing the reaction conditions and the post-treatment process, the obtained benzidine product is an off-white solid, the purity meets the requirements of various application scenes such as dye intermediates, high polymer material chain extenders and detection reagents, the problems of excessive product impurities and substandard purity caused by insufficient reaction selectivity in the prior art are avoided, and the method is suitable for industrial production. The practical value and the market applicability of the synthesis method are further guaranteed.

The invention belongs to the technical field of macromolecular flame retardants, and relates to a fluoride-free macromolecular flame retardant for transparent polycarbonate and a preparation method thereof, the structural general formula of the fluoride-free macromolecular flame retardant for polycarbonate is shown in the specification, and n, m and l are natural numbers of 5-10 respectively; m is a metal cation and is selected from one of Li < + >, Na < + >, K < + >, Rb < + > and Cs < + >; the preparation method comprises the following steps: mixing a cyanuric chloride solution, an aryloxy sulfonate solution and an acid-binding agent, and reacting to obtain a triazine monosubstituted intermediate; then heating to 45-50 DEG C, adding a metal salt solution of bisphenol S and an acid-binding agent, and reacting to obtain a triazine disubstituted intermediate; heating to 85-90 DEG C, adding a metal salt solution of benzidine disulfonic acid and an acid-binding agent, and reacting to obtain a product; according to the application, the flame retardant is added into transparent polycarbonate resin and is used for preparing a flame-retardant polycarbonate material. The product disclosed by the invention can keep high flame-retardant efficiency and also has long-term service stability; the preparation method is simple; the application range is wide.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency and mechanical properties. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes a tetracarboxylic dianhydride having a fluorene structure and a tetracarboxylic dianhydride having an ether bond.

The invention relates to the technical field of preparation of 3, 3 '-diaminobenzidine, and discloses a method for crystallizing and purifying 3, 3'-diaminobenzidine, which comprises the following steps: (1) dissolving a 3, 3 '-diaminobenzidine crude product in a good solvent; (2) contacting the dissolved 3, 3 '-diaminobenzidine crude product with activated carbon, and then carrying out solid-liquid separation to obtain a solution; (3) adding at least part of a solvating-out agent into the solution obtained in the step (2), and growing crystals; after crystal growing is finished, adding the residual solvating-out agent, and then carrying out first aging; (4) cooling a product obtained by the first aging, carrying out second aging at the temperature, carrying out solid-liquid separation, washing and drying; the cooling rate is 0.1 to 0.4 DEG C / min. According to the method disclosed by the invention, the 3, 3 '-diaminobenzidine product with high purity and high yield can be obtained.

The present invention provides a polyamic acid composition for preparing a soluble polyimide solution and a soluble polyimide solution prepared therefrom, the polyamic acid composition comprising a polyamic acid comprising, as polymerization units, a dianhydride monomer and a diamine monomer, wherein the dianhydride monomer includes bisphenol A dianhydride (BPADA) and biphenyl tetracarboxylic dianhydride (BPDA), and the diamine monomer includes 2,2'-bis(trifluoromethyl)benzidine (TFMB).

The application discloses a high-shielding and high-whiteness polyimide film, which comprises a polyimide polymer obtained by reaction of diamine monomers and dianhydride monomers, wherein the diamine monomers are phenylenediamine (PDA) and 2,2'-bis(trifluoromethyl) benzidine (TFMB), and the dianhydride monomers are 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA); wherein, based on the total moles of the diamine monomers, the PDA is 16-25 mol%, and the TFMB is 75-84 mol%; and a plurality of color-producing fillers distributed in the polyimide polymer. The polyimide has a low gloss of 3-10 GU, and an L* value of 80-90, a b* value of 1.8-5.5, and a transmittance of 3-15%.