39 results about "Thymolphthalein" patented technology

The invention discloses an alkali lipase type time and temperature indicating process and a product, belonging to the technical field of farm product storage and transportation. The reaction system comprises using 0.1mL alkali lipase solution with 1gL-1 concentration, 0.5mL reaction substrate glyceryl triacetate, PVA9.5mL emulsifier with 20gL-1 concentration, 0.7mL CaC12 solution with 1molL-1 concentration, 39mL Gly-NaOH buffer solution with 0.05molL-1 concentration and 10.6pH, and 0.2mL phenol red-thymolphthalein mixing solution as the indicator of the reaction, deciding the relative relation with the time and temperature accumulating effect according to the reaction system color parameters values L*, a* and b* detected by CIE in the colourometry after starting the reaction. The alkali lipase type time and temperature indicating process of the invention can accurately indicate the time and temperature accumulating effect of objects in the process of production, storage, transportation and marketing.

The invention relates to a polymerization method capable of effectively controlling the phase transformation in a PPTA (poly-p-phenylene terephthamide) synthesis process. The polymerization method comprises the following steps of firstly dissolving LiCl in a solvent NMP (N-methyl-2-pyrrolidone) under the condition of nitrogen atmosphere protection, then adding comonomer p-phenylenediamine, terephthaloyl chloride and trace comonomer, adding acid absorbent pyridine, stirring so as to completely dissolve the acid absorbent pyridine, then adding PPD ((Para Phenylene Diamine), stirring so as to completely dissolve the PPD, then feeding condensing oil bath, maintaining the temperature of the condensing oil bath at -15 DEG C to -5 DEG C, adding TPC (Thymolphthalein Complexone) in three times, and stirring so as to fully react the TPC, thus obtaining modified PPTA resin, wherein the logarithmic viscosity number of the modified PPTA resin is in the range of 5.0-8.0, and the trace comonomer is a diamine monomer containing a flexible chain structure. The polymerization method is a method of effectively increasing the molecular weight by using the phase transformation; and according to the method, the phase transformation time of transforming a liquid phase into a solid phase can be delayed in the polymerization process, so that the molecular weight is effectively increased and the turbidity of a liquid crystal spinning solution is improved.

The invention provides a monochromatic color bubble solution capable of fading. The monochromatic color bubble liquid comprises the following components in weight percent: 99.5230 percent of distilled water, 1.8524 percent of color-changing agent (phenolphthalein, thyme phenolphthalein / thymolphthalein and o-cresolphthalein), 0.3756 percent of sodium bicarbonate, 0.1523 percent of lauryl sodium sulfate and 0.2215 percent of sodium carboxy methyl cellulose (food grade), wherein the solution is basic; and a used indicator is phenolphthalein, thyme phenolphthalein / thymolphthalein or o-cresolphthalein. The monochromatic color bubble solution capable of fading is a basic solution, and can be used for producing monochromatic color bubbles capable of fading by blowing.

The invention discloses a substrate for detecting beta-D-glucuronidase. The substrate is specifically thymolphthalein-alpha-D-glucuronic acid. A preparation method comprises the following steps: preparing thymolphthalein-alpha-D-methyl glucuronate through reaction of thymolphthalein and acetyl bromide-alpha-D-methyl gluconate, removing acetyl to obtain the thymolphthalein-alpha-D-methyl gluconate,and then performing hydrolysis reaction, so as to obtain the thymolphthalein-alpha-D-glucuronic acid. As the substrate for detecting the beta-D-glucuronidase, the thymolphthalein-alpha-D-glucuronic acid disclosed by the invention has the advantages of stable property, difficulty in deterioration and sensitivity to development; furthermore, a synthesis process is simple, and the cost can be obviously reduced.

The invention discloses a method for measuring formaldehyde content in tetrakis hydroxymethyl phosphonium sulfate, which comprises the steps of: weighing 2-5 g of sample and putting the sample in a 250 mL conical flask, adding 50 mL of distilled water therein, dripping 5 drops of thymolphthalein indicator, adjusting the test solution to microscopic blue by sodium hydroxide solution or hydrochloric acid solution; adding 50 mL of sodium sulfite solution and immediately titrating the solution to an end point by a standard hydrochloric acid titration solution; and performing a blank test in the same method. Compared with the method of measuring formaldehyde content by an instrument, the method of the invention has the advantages of utilizing acid-base titration and optimizing the conditions, thereby having few utilized reagents, simple preparation, long service life of reagents, simple and convenient operation and low detection cost.

In lithography, a composition comprising a novolak resin comprising recurring units derived from a phenolphthalein, Phenol Red, Cresolphthalein, Cresol Red, or Thymolphthalein is used to form a photoresist underlayer film. The underlayer film is strippable in alkaline water, without causing damage to ion-implanted Si substrates or SiO2 substrates.

The invention provides an acid-base indicator named thymolphthalein aldehyde. A preparation method of that acid-base indicator comprises the following steps: 1) mixing 1.5-2.0 mmol of thymolphthaleinand 1.0-2.0 mmol of urotropine (HMTA) and adding the mixture to a 50ml three-neck bottle, adding 0.15-0.20 mol (10-15 ml) of trifluoroacetic acid under the ice-bath condition, stirring the solution for 30 min and then heating the solution to room temperature; 2) continuing oil bath heating to 72 DEG C for reflux reaction for 8-24 hours, stopping the reaction, and removing excess trifluoroacetic acid by rotary evaporation; 3) adding an appropriate amount of H2O, stirring the solution, heating the solution to 60 DEG C, performing filtering after 30 min, performing drying to obtain a solid, and further separating the solid by column chromatography to obtain faint yellow powder. The indicator is easy to synthesize, stable in structure and sensitive in color change, and the PH color change is in a range of 10.8-12.0.

The invention discloses a dual purpose type oil and water finding paste, and belongs to the technical field of fine chemical engineering product preparation. The dual purpose type oil and water finding paste consists of ingredients of, based on weight parts, 12-18 parts of polyethylene glycol 600, 15-20 parts of titanium dioxide, 5-8 parts of polyethylene 2000, 1-1.4 parts of boric acid tri-n-butyl, 0.06-0.12 part of castor oil, 3.5-4.0 parts of fumed silica, 28-34 parts of Vaseline, 3-5 parts of calcium oxide, 1.3-1.8 parts of thymolphthalein, 18-22 parts of kaolin and 0.22-0.28 part of 1-[[2,5-dimethyl-4-[(2- methyl phenyl) monoazo] phenyl]-2-naphthol. The dual purpose type oil and water finding paste has the advantages of respectively displaying different colors after contacted with oil and water, and being distinct and stable in color boundary line.

A method for determining the content of calcium element in an ore is provided. It includes: decomposing the ore with hydrochloric acid and nitric acid under heating condition, adding perchloric acid, cooling, adding a small amount of water and boiling the solution to dissolve the salts, then cooling, diluting to the constant volume, filtering into a dry beaker with dry filter-paper, masking interfering ions with triethanolamine, adjusting the pH value of the solution with KOH, using calcein-thymolphthalein as indicator, and determinating the content of calcium with EDTA titrimetry.

The invention provides an acid-base indicator named thymolphthalein aldehyde. A preparation method of that acid-base indicator comprises the following steps: 1) mixing 1.5-2.0 mmol of thymolphthaleinand 1.0-2.0 mmol of urotropine (HMTA) and adding the mixture to a 50ml three-neck bottle, adding 0.15-0.20 mol (10-15 ml) of trifluoroacetic acid under the ice-bath condition, stirring the solution for 30 min and then heating the solution to room temperature; 2) continuing oil bath heating to 72 DEG C for reflux reaction for 8-24 hours, stopping the reaction, and removing excess trifluoroacetic acid by rotary evaporation; 3) adding an appropriate amount of H2O, stirring the solution, heating the solution to 60 DEG C, performing filtering after 30 min, performing drying to obtain a solid, and further separating the solid by column chromatography to obtain faint yellow powder. The indicator is easy to synthesize, stable in structure and sensitive in color change, and the PH color change is in a range of 10.8-12.0.

The invention discloses a method of simultaneously measuring the contents of OH- and sulfides in sulfur-bearing wastewater, which particularly includes: 1) adding a BaCl2 solution to a wastewater sample and allowing the solution to stand for 5-10 min, and filtering the solution to obtain a supernatant; 2) adding deionized water to the supernatant to 100 ml in volume, thus preparing a wastewater diluent; 3) dropwise adding 4-6 drops of a thymolphthalein indicator to the wastewater diluent and performing titration by using a HCl standard solution until the color of the wastewater diluent turns from blue to colorlessness, and recording the volume (V1) of the HCl standard solution consumed in the first time; 4) dropwise adding 4-6 drops of a methyl orange indicator, and performing titration byusing a HCl standard solution until the color of the wastewater diluent turns from yellow into red, and recording the volume (V2) of the HCl standard solution consumed in the second time; 5) according to an equation, respectively calculating the contents of OH- and sulfides in the wastewater. In the invention, for the first time, the sulfides in sulfur-bearing wastewater are measured by means ofthe acid titration method; the method is simple and has high analysis speed.

The invention relates to a product for transformation of a toxic corrosive or environmentally-noxious product into a non-corrosive or non-noxious residue, comprising at least one amphoteric agent, at least one lipophilic absorbent, at least one hydrophilic absorbent and at least one binary colored indicator, selected from the group of the following mixtures: Nile blue / alizarin red, alizarin yellow / alizarin red, thymolphthalein / methyl red, phenolphthalein / methyl red and tropaeolin OO / thymol blue and optionally an additive selected from the group comprising charge agents, granulation agents, anti-static agents and mixtures thereof.

The present invention relates to the field of anti-counterfeiting technology, specifically a kind of anti-counterfeiting ink composition with moderate viscosity, which can meet the requirements of reliable preservation of anti-counterfeiting patterns in the identification period and timely elimination of anti-counterfeiting patterns after the identification period, and its use method, which is characterized in that it comprises the following: Components: water, thymolphthalein or phenolphthalein, glycerin, alcohol, sodium stearate or sodium polyacrylate, sodium hydroxide, when the cover plate of the anti-counterfeiting label is destroyed during use, part or all of the information on the label will be displayed on the Disappear within a period of time, this method can solve the disadvantages of high anti-counterfeiting costs and cumbersome search methods, and at the same time effectively prevent counterfeiters from using the old packaging of the product to fake in batches.