39 results about "Thymolphthalein" patented technology

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 a humidity indicator which is really effective in environmental protection and comprises a carrier and solution used for soaking the carrier; wherein, the solution takes 30-80% of ethanol as a solvent and contains 0.00862-0.00992% of acid-base indicator and 0.8-13.8% of hygroscopic salt. The acid-base indicator is one of bromocresol green, bromothymol blue, thymol blue, thymolphthalein, bromophenol blue, methyl red, methyl orange, methyl yellow , neutral red and phenol red or the mixture thereof. The hygroscopic salt is alkali halide or alkali-earth metal halide. The humidity indicator of the invention has wide indicating range (capable of indicating 5-90% of ambient humidity) and high sensitivity. Diverse humidity indicators different in discoloration can be manufactured by adjusting the components. The humidity indicator of the invention has evident discoloration effect, simple use, reutilization, good suitability and extensive application.

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 provides a writing board coated with surface-modified paint and a writing liquid matched with the writing board. The writing board is produced by coating a layer of developing paint on an undertint matte base plate, wherein the developing paint is prepared by the following steps of: dissolving thymolphthalein into ethanol; adding glutaric dialdehyde and reacting at the temperature of 40-60DEG C for 0.5-1.5 hours; adding xylene, acetone and polyurethane and uniformly stirring; and finally, adding a bonding agent and fully stirring. The writing liquid matched with the writing board is prepared by the following steps of: dissolving NaOH or KOH into water; adding ethanol; and finally, adding a flavoring agent and uniformly stirring. The writing liquid can write blue handwriting on the writing board and the handwriting can be wiped with wet cloth. The writing board disclosed by the invention is simple in process; the paint used once can be repeated used for over 6 months; and the used writing liquid is simple, practical and economic in formula. The writing board and the writing liquid are suitable for occasions having various writing demands, such as schools, families and office.

The invention relates to a color changing ink, comprising color changing agent, color-developing agent, glycerin, alcohol, sodium nitrite and clwan water. Said color changing agent comprises thymolphthalein and fenolftaleina, thymolphthalein is used for blue ink, the color changin domain is from 9.3- 10.5, and can change from colorless to blue; fenolftaleina is used for red ink, the color changing domain is from 8.2 to 10, and can change from colorless to red. The color-developing agent is calcium hydroxide, which can disslove into glycerin, and is used for pH moderation. The glycerin is used as solvent and shaping agent, can disslove in water at any ratio, and the coagulating point is quite low. Said alcohol is used as assisting solvent, and nitrite sodium is used as protecting agent. The preparing process comprises stirring produced mixing liquid, stewing in colsed container for 2 to 3 days, and the supernatant can be used as said color changing ink. The invention belongs to student article, and can be widely used for student writing practice, which can save a large amount of paper.

The invention provides green ink capable of fading by hydrolyzing and a preparation method thereof. The green ink comprises the following components in percent by weight: 1%-5% of p-nitrophenol, 1%-6% of sodium hydroxide, 80%-92% of water, 1%-5% of urea, 1%-4% of glycerol, 0.1%-1% of formaldehyde, 0.05%-0.5% of hydroxyethyl cellulose, 0.5%-3% of fatty alcohol-polyoxyethylene ether sodium sulfate, 0.5%-5% of thymolphthalein blue complexing agent, and 0.5%-3% of triethanolamine. The ink can be quickly faded to be colorless while meeting water under a neutral condition, can be used as ink for white board teaching and writing, and also can be used as writing and drawing ink for children. The ink disclosed by the invention is easy in obtaining materials, simple in preparation method, bright in color, long in color holding time; and handwriting can be directly erased out by water without marks, so that board surface is not contaminated.

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.

The invention discloses a method for determining the content of bound acrylonitrile in butadiene-acrylonitrile rubber. The method includes the following steps: (1) heating an extracted butadiene-acrylonitrile rubber sample with the weight being m1 to 400 DEG C, cracking, collecting a crackate, and weighing the crackate constant weight being m2; (2) carrying out a test experiment, taking the crackate with the mass being m3, dissolving in dilute sulfuric acid, then putting into a container, dropping 2-3 drops of an alizarin yellow-thymolphthalein mixed indicator, and titrating the sample to light blue with a 0.1 mol / L sodium hydroxide standard solution; adding 10 mL of a sodium sulfite solution with the concentration of 126 g / L, making the solution become bluish violet, shaking evenly, covering with a bottle plug, sealing well, placing for 5 min, then titrating to faint yellow with a 0.1 mol / L sulfuric acid standard solution, and making the consumed sulfuric acid standard solution be V1; and carrying out a blank experiment, and making the consumed sulfuric acid standard solution be V0; and (3) calculating test results. The method can be applicable to measurement of the content of bound acrylonitrile in vulcanized butadiene-acrylonitrile rubber simultaneously, and moreover, the measured results are accurate and convenient.

The invention relates to a preparation method of universal pH test paper. An indicator is prepared by dissolving Metanil yellow, m-methyl red, nitrazine yellow, titan yellow, alizarin yellow R, bromothymol blue, thymol blue, thymolphthalein, phenolphthalein, bromocresol green and o-cresolphthalein in a 30% ethanol water solution. The preparation method comprises the following steps: previously impregnating base paper of pH test paper in the prepared indicator solution, and drying with heating steam of 95-105 DEG C at normal pressure. The preparation method of universal pH test paper is simple in process, stable in product quality and higher in sensitivity and accuracy in comparison with the common universal test paper, and can be widely used in the fields of scientific research, industry, agriculture, environmental protection, medicine and food.

The invention belongs to a field of immunization analysis and diagnosis technology, and concretely relates to a visual multicolor detection kit for antigen-antibody reaction and a using method of kit. According to the invention, the kit comprises CEA antibodies labeled with grapheme modified by methyl red; NSE antibodies labeled with grapheme modified by phenolphthalein;Cyfra21-1 antibodies labeled with grapheme modified by thymolphthalein; a 96-well plate coated with a monoclonal antibody mixture containing CEA, NSE and Cyfra21-1 antibody; alkaline water whose pH value is 12.0; and a PBST buffersolution. The kit provided by the invention can be used for simultaneous multicolor detection of CEA, NSE and Cyfra21-1 antigen. The kit provided by the invention has the advantages of simple operation, high efficiency and low cost, and is convenient to be used in the places short of resource and less developed areas.

The invention provides polyvinyl alcohol-thymolphthalein acetal and a preparation method and application thereof. The preparation method of the polyvinyl alcohol-thymolphthalein acetal comprises the steps of: firstly, synthesizing thymol phthalaldehyde based on a discoloration principle of thymolphthalein, and performing an aldolization reaction on polyvinyl alcohol and thymol phthalaldehyde to form the stably combined polyvinyl alcohol-thymolphthalein acetal compound; on the basis of the compound, a discoloration material is prepared by using the following formula of: 20-40 parts of polyvinylalcohol, 0.5-8 part s of plasticizer, 0.1-1 part of surfactant, 8-10 parts of polyvinyl alcohol-thymolphthalein acetal, 0.5-2 parts of silicone oil and 40-60 parts of water. The synthesized discoloration material has the advantages that the discoloration material turns blue when meeting with a small amount of alkali, and fades when meeting with water.

The invention aims to provide erasable colorful hydrolysable ink capable of fading and disappearing and a preparation method of the erasable colorful hydrolysable ink. The erasable colorful hydrolysable ink capable of fading and disappearing comprises a first component and a second component, wherein the first component comprises the following ingredients in parts by weight: 0.2-0.4 part of phenolphthalein and at least one of 0.5-0.9 part of thymolphthalein and 0.2-0.4 part of paraxylene phenolphthalein; and the second component comprises the following ingredients in parts by weight: 0.9-10 parts of sodium hydroxide, 10-60 parts of ethanol, 50-80 parts of distilled water, 1-5 parts of propylene glycol, 1-5 parts of glycerinum, 0.1-0.4 part of formaldehyde, 0.01-0.03 part of stearic acid, 0.2-1 part of sodium alginate, 1-5 parts of starch, 0.2-0.6 part of 1,2-benzoisothiazolinone-3-one, 0.5-8 parts of methanol, 0.01-0.05 part of alkylphenol ethoxylates and a plurality of essence. The erasable colorful hydrolysable ink capable of fading and disappearing is healthful and environment-friendly, can be erased with clear water, and can automatically disappear after being used for writing for a long time; and a preparation process is simple.

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 relates to the technical field of anti-counterfeiting, and specifically relates to an anti-counterfeiting ink composition which is mild in viscosity and enables reliable storing of an anti-counterfeiting pattern in a discrimination stage and timely removal of the anti-counterfeiting pattern after the discrimination stage, and a use method of the anti-counterfeiting ink composition. The anti-counterfeiting ink composition is characterized by comprising the following components: water, thymolphthalein or phenolphthalein, glycerinum, ethyl alcohol, sodium stearate or sodium polyacrylate and sodium hydroxide; when a covering plate of an anti-counterfeiting label is damaged during use, some or all information of the label disappear over a period of time; the method can solve the shortages of high anti-counterfeiting cost and complex searching means, and meanwhile, that a counterfeiter counterfeits by mass with the old packages of products can be effectively avoided.

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.

The invention relates to whiteboard pen ink capable of fading with water, and belongs to the technical field of stationery products. The green, environmentally-friendly and color-saturated whiteboardpen ink capable of fading with water is prepared by using sodium hydroxide and thymolphthalein as a solute, dissolving the sodium hydroxide and thymolphthalein in a solvent matched by water and ethanol, using a principle of color change of an indicator to prepare a color developing agent; and adding a film-forming agent PVB, surfactant DowFAX2A1 and Span-20, wetting dispersant OT-75, propylene glycol and glycerol, and drier propylene glycol monomethyl ether auxiliary agents. The results show that when ethanol is 48.25%, water is 36.19%, alkali is 1.2%, indicator is 6.63%, film-forming agent is1.2%, surfactant is 3.6%, dispersant 1. 08%, drier is 1.8%, ink performance achieves the best result. Ink is smooth in writing and stable in performance, has no pollution, no irritating odor and canbe wiped clean with clear water while writing on the glossy and matt panels.

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 discloses a preparation method of pH-responsive color-changing nano-particles based on bacitracin and thymolphthalein co-assembly and a method for visually detecting escherichia coli by using the nano-particles. During preparation, the bacitracin and the thymolphthalein are co-assembled, and the thymolphthalein and the bacitracin are co-assembled by utilizing the polarity change of a solution to form nanoparticles; the method comprises the following steps: firstly, preparing an aptamer modified magnetic bead, then constructing a sandwich structure by using nanoparticles, the aptamer modified magnetic bead and bacteria, finally, stimulating thymolphthalein to develop color by adding a NaOH solution, and constructing a linear relationship with E.coli concentration change by detecting a delta OD value through a microplate reader or detecting an (R + G) / B value through a smart phone, so as to realize quantitative visual detection of E.coli. Experiments such as structural characterization, experimental condition optimization and sensing performance analysis on the AMP / TP NPs material prove that the material can be used for E.coli analysis and detection. The detection method disclosed by the invention is convenient to operate, high in response speed and easy to popularize and use.

The invention discloses a composite pen with functions of invisible pen, disappearing ink pen and, color chromogenic pen and copying pen, which comprises a hollow pen holder and two pen refills inserted into both ends of the hollow pen holder, wherein the exposed ends of the two pen refills are respectively inserted into pen tips; caps are respectively sheathed on both ends of the hollow pen holder; an invisible ink and a word disappearing agent are filled in one pen refill; a word disappearing agent, a developing agent and a copying agent; the invisible ink contains ethanol, phenolphthalein or thymolphthalein and water; the word disappearing agent contains sodium sulfite or potassium sulfite and water; the developing agent contains water, acetic acid or citric acid, or sodium hydroxide or sodium carbonate; and the copying agent contains hydrogen peroxide. The tips of the two pin refills can write invisible words respectively, and the words written by the two pen refills can be developed by mutually smearing. The tips of the two pen refills can independently eliminate writings of blue pen, red pen or neutral erasable pen, and pens and neutral erasable pens can be used for writing at positions where the words are eliminated.