134 results about "Dihydroxyanthraquinone" patented technology

The present invention relates to a process for preparing 1-amino-4-hydroxyanthraquinones of the formula (I) wherein R is an aliphatic or aromatic radical, by reacting 1,4-dihydroxyanthraquinone, with aliphatic or aromatic amines in the presence of N-methyl-2-pyrrolidone.

The invention discloses a preparation method of light-resistant and waterproof water-based flame retardant polyurethane coating and adhesive. The preparation method of the light-resistant and waterproof water-based flame retardant polyurethane coating and adhesive comprises the following steps: mixing polytetrahydrofuran glycol with isophorone diisocyanate in the presence of a fullerene catalyst, reacting at the temperature of 60-85 DEG C for 1-2 hours, adding coumaphos and propantheline bromide, and reacting at the temperature of 70 DEG C for 3 hours, so that polyurethane prepolymer A is obtained; adding a chain extender, butanone and riboflavin sodium phosphate into the polyurethane prepolymer A, reacting at the temperature of 60-85 DEG C for 2.5-3.5 hours, adding a flame retardant, reacting at the temperature of 75-85 DEG C for 1-2 hours, then adding 1,4-dihydroxy anthraquinone, polyacrylamide and a tackifying agent, reacting at the temperature of 75 DEG C for 1-2 hours, then adding triethylamine and carrying out neutralization reaction for 30-50 minutes, adding water and emulsifying for 30 minutes, so that the light-resistant and waterproof water-based flame retardant polyurethane coating and adhesive are obtained. The prepared light-resistant and waterproof water-based flame retardant polyurethane coating has triple performance of flame retardance, light resistance and water resistance; meanwhile, polyurethane is environment-friendly and low in cost, so that the prepared light-resistant and waterproof water-based flame retardant polyurethane coating can be widely applied to surfaces of a wall body, furniture and metalware; the prepared light-resistant and waterproof water-based flame retardant polyurethane adhesive can be taken as a binder for plastic, glass, paper, textiles and leather.

A compound of formula (1), wherein X is H or -OCR1 and Y is H or -OCR2, provided that X and Y are not both H; and R is CH2OR9, CONR11R12, CN, tetrazole or COOR17; or a salt thereof, has therapeutic utility.

The invention discloses an electrolyte capable of improving hydroxy-anthraquinone solubility in an anthraquinone redox flow battery and a preparation method for the electrolyte, and belongs to the fields of energy and chemical industry. The electrolyte comprises deionized water, potassium hydroxide, hydroxy-anthraquinone and tetra alkyl ammonium halide, wherein the hydroxy-anthraquinone is selected from at least one kind of 1, 4-dyhydroxyl anthraquinone, 1, 8-dyhydroxyl anthraquinone, 2, 6-dyhydroxyl anthraquinone and 1, 4, 5, 8-tetrahydroxy anthraquinone; the tetra alkyl ammonium halide is preferably selected from tetraethyl ammonium chloride and tetraethyl ammonium bromide, wherein the adding mass percentage of the tetra alkyl ammonium halide is 0.1-20% of the total weight of the electrolyte. At the room temperature, hydroxy-anthraquinone and tetra alkyl ammonium halide are dissolved into potassium hydroxide at the mass ratio of 1-5 to 1, and steps of stirring and heating are performed to reach 60-90 DEG C to obtain the electrolyte. The hydroxy-anthraquinone is high in solubility in the electrolyte provided by the invention; and in addition, when the electrolyte is used for the anthraquinone redox flow battery, the battery obtains very excellent charging-discharging performance.

The invention discloses a synthesis method of a solvent green 3. According to the synthesis method, a target product is obtained by taking 1,4-dihydroxy anthraquinone and p-toluidine as raw materials, ethanol as a solvent, boric acid as a catalyst, a 1,4-dihydroxy anthraquinone leuco body as an initiator, sodium hydrogensulfite as an antioxidant and benzene as an azeotrope agent of a system through condensation reaction. According to the synthesis method, the ethanol with a low boiling point is used as the solvent and the solvent green 3 is hardly dissolved in the ethanol, so that the yield of a product is improved and the recycling energy consumption of the solvent is also reduced; the 1,4-dihydroxy anthraquinone leuco body is used as the initiator, has the effect of a reaction initiator and also has a catalytic action in a reaction process; the activity of the 1,4-dihydroxy anthraquinone leuco body can be guaranteed in the presence of the antioxidant, namely the sodium hydrogensulfite, and the initiation and catalysis effects are improved.

A voltammetric pH sensor, especially for characterising wellbore fluids, comprises a plurality of electrodes with a redox active organic compound attached to an electrode and having at least one functional group convertible electrochemically between reduced and oxidized forms with transfer of at least one proton between the compound and surrounding aqueous phase, wherein the compound has at least one substituent group which promotes hydrogen bonding at a said functional group and thereby increases the reaction rate of proton transfer. The substituent group may form an internal hydrogen bond with a redox-convertible group or may enhance polarity to promote electrostatic interaction with water molecules and reduce activation energy. Typical examples include alizarin or 1,2-dihydroxy-anthraquinone (RH=72-48-0), quinizarin or 1,4-dihydroxy-anthraquinone (RN=81-64-1), 2-acetoxy-benzoquinone (RN=1125-55-9), chloranil or 2,3,4,5-tetrachloro-benzoquinone (RN=118-75-2) and 1,4-diamino-2,3-dichloro-anthraquinone (RN=81-42-5) deposited on a glassy carbon electrode. In this way, anomalous measurements at low ionic strength and low concentrations of pH buffering species can be overcome.

The invention discloses an anthraquinone dissolvent dye and preparation and application in dye technical domain, which is characterized by the following: setting the composite as general formula (I); choosing R1 from hydroxyl group or II; choosing R2 from metyl group or ethyl group; adopting vacuum rectifying craft; extracting 2-ethyl group-6-secondary butyl aniline or 2-metyl group-6-secondary butyl aniline; proceeding condensation reaction with 1, 4-alizarin; preparing the general formula (I) component; decreasing the cost of dye. This dye can be used to color oil, hard plastic rubber and resin, which can get brilliance red light blue and bright violet.