14 results about "Methyl red" patented technology

The invention belongs to the technical field of methyl red azo dye purification, and discloses a methyl red azo dye adsorbent with good adsorption performance on a methyl red azo dye adsorbent, and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a first precursor solution and a second precursor solution; the first precursor solution contains melamine, and the second precursor solution contains cyanuric acid and / or barbituric acid; (2) sequentially adding the first precursor solution and the second precursor solution into biomass carbon powder to form a reaction solution; enabling the supermolecule aggregate to grow in situ and coat the surface of the biomass carbon powder under a stirring condition to form a solid-liquid mixture; removing the solvent in the solid-liquid mixture, and drying to obtain a supramolecular composite precursor; (3) carrying out pressure molding on a mixture of the supramolecular composite precursor, silicate clay mineral and nickel salt to obtain a green body; and (4) carrying out heat treatment on the green body to obtain the methyl red azo dye adsorbent.

The application provides a preparation method of a water-resistant intelligent colorimetric label for indicating food freshness, and belongs to the technical field of food packaging. A mixed dye is prepared by taking methyl red and bromothymol blue as raw materials, then the aqueous phase solution is obtained by adding the mixed dye into a chitosan gelatin solution, and the aqueous phase solution is added into an oil phase containing an emulsifier to perform emulsification and crosslinking, so that pH color developing microspheres are formed, and finally, the pouring method is adopted to prepare the water-resistant intelligent colorimetric label for indicating food freshness. The colorimetric label prepared by the application embeds the methyl red and the bromothymol blue in the ethyl cellulose film by using the microsphere method, which not only ensures the response of the colorimetric label to the acidic gas, but also avoids the influence of the environmental humidity on the indication accuracy, and the methyl red and the bromothymol blue cannot be dissolved out under high humidity, so that the stability of the film in the high humidity environment is ensured.

This invention discloses a gel-like flange protection and monitoring material, its preparation method, and its application, belonging to the field of industrial flange protection and leakage monitoring technology. The material is a toothpaste-like extrudable colloid, comprising, by weight: 75-88 parts of protective matrix adhesive, 3-12 parts of pH-responsive core-shell microcapsules, 1-3 parts of interface compatibilizer, 2-5 parts of toughening modifier, 0.5-2 parts of anti-aging additive, 1-4 parts of thixotropic modifier, and 0.5-2 parts of anti-corrosion additive. The pH-responsive microcapsules use a compound of methyl red, bromocresol green, and thymol blue as the core material, with a particle size of 20-50 μm and a shell thickness of 2-3 μm. This invention replaces traditional flange covers with an extrusion coating method, eliminating the need for bolt fixing. It is suitable for flanges of various sizes, providing physical protection against impacts, dust, and media splashes. Simultaneously, it rapidly develops color when acidic or alkaline media leak, enabling naked-eye visual monitoring of the leakage location. It is convenient to construct and simple to maintain, and is suitable for flange protection in industries such as chemical, petroleum, water, and energy.

The invention belongs to the technical field of MOF synthesis and dye adsorption, and particularly relates to an electrochemical synthesis method of iron-based pacs-MOF and application of the iron-based pacs-MOF in organic dye adsorption.The electrochemical synthesis method comprises the following steps that terephthalic acid, 2, 4, 6-tri (4-pyridyl)-1, 3, 5-triazine and tetrabutylammonium bromide are added into a mixed solvent of DMF and ethyl alcohol, acetic acid is added, the mixture is stirred to be uniform, the reaction is carried out, and the iron-based pacs-MOF is obtained. Performing ultrasonic treatment on the obtained mixed raw material; taking an iron sheet as a cathode and an anode, taking the uniformly mixed solution as an electrolyte, fixing the electrodes, and carrying out electrochemical reaction; and after the reaction is finished, centrifuging reaction liquid, removing supernate, adding ethanol into a centrifugal tube, activating, and drying after the activation is finished, so as to obtain a sample. The iron-based pacs-MOF can be applied to methyl red adsorption, and the maximum adsorption capacity is 997 mg / g.

The invention relates to the technical field of lithium ion battery positive electrode material detection, in particular to a method for measuring the content of soluble lithium in a lithium manganate finished product, which comprises the following steps of: taking 5g of lithium manganate finished product sample, putting into a 250mL beaker, adding 50mL of purified water and a magnetic stirrer, covering, stirring for 20 minutes at the rotating speed of 550r / min, standing for 2 minutes, and filtering supernate by two layers of filter paper; transferring 10 mL of filtrate to a 250 mL conical flask, adding 40 mL of purified water, firstly adding 2 drops of phenolphthalein, titrating with 0.0104 mol / L hydrochloric acid until the solution is colorless (denoted as v1), then adding 3 drops of methyl red, continuously titrating until the solution is orange, boiling for 1 min, cooling, titrating until the solution is wine red (denoted as v2), and calculating according to the formula that the content of lithium carbonate is equal to (v2-v1) * 0.0104 * 73.886 / m; the method for determining the content of soluble lithium in the lithium manganate finished product is simple and accurate to operate, rapid and efficient, can optimize the process, saves time and labor, can determine the quality of soluble lithium so as to judge the performance of a material body in advance, and ensures the production of high-quality lithium manganate.

This invention discloses a reversible responsive MOF-confined colorimetric sensor patch and its preparation method, belonging to the field of aerogel-based colorimetric sensing technology. The sensor patch is composed of agarose, polyethylene glycol, and a UiO-66 / methyl red composite aerogel. Methyl red is anchored within the MOF through the nanopore confinement effect of UiO-66 and the coordination of zirconium cluster sites, forming UiO-66 / methyl red composite nanoparticles, which are interleaved within the porous network structure layers formed by hydrogen bonding cross-linking of agarose and polyethylene glycol. The preparation method includes: hydrothermal synthesis of UiO-66 / methyl red composite nanoparticles, mixing with polyethylene glycol, adding agarose to dissolve, and freeze-drying to form the final product. This patch exhibits properties such as resistance to dye leakage, resistance to temperature interference, reversible response, wide pH response, and rapid response, and can be used for pH detection in scenarios such as body fluids, environmental water samples, bacterial cultures, and wounds.

The application belongs to the technical field of methyl red azo dye purification, and discloses a methyl red azo dye adsorbent with good adsorption performance on methyl red azo dye, and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a first precursor solution and a second precursor solution; the first precursor solution contains melamine, and the second precursor solution contains cyanuric acid and / or barbituric acid; (2) sequentially adding the first precursor solution and the second precursor solution into biomass carbon powder to form a reaction liquid; under stirring, in-situ growth of a supramolecular aggregate is realized and the supramolecular aggregate is coated on the surface of the biomass carbon powder to form a solid-liquid mixture; the solvent in the solid-liquid mixture is removed, and the supramolecular composite precursor is obtained through drying; (3) pressure forming a mixture of the supramolecular composite precursor, a silicate clay mineral and a nickel salt into a green body; and (4) performing heat treatment on the green body to obtain the methyl red azo dye adsorbent.

According to the pH detection cat litter based on the plant particles and the preparation method of the pH detection cat litter based on the plant particles, the plant starch particles with the neutral pH are selected as inner cores, and interference of traditional mineral matrix alkalinity deviation on the detection accuracy is effectively avoided; in combination with a polymer coating fixed bromothymol blue and methyl red double indicator system, by utilizing the complementary characteristic of color change intervals of bromothymol blue and methyl red, the obvious color change from orange red to green is realized at the critical threshold of cat urine pH 6.8-7.0, and the problems of blurred color development and difficulty in identifying a transition region in the prior art are solved. Meanwhile, the storage stability and the liquid response speed of the indicator are effectively improved.

The invention relates to the technical field of preparation of water quality purification resin, and discloses color-changing type water quality purification resin and a preparation method thereof, and the color-changing type water quality purification resin is prepared from a methyl red structure modified monomer, a thymol blue structure modified monomer, sodium p-styrenesulfonate, divinylbenzene, a magnetic response enhanced monomer, a photoinitiator, a thermal initiator, polyvinyl alcohol, sodium dodecyl benzene sulfonate and ionized water. The preparation process comprises the following steps: preparing methyl red and thymol blue modified monomers; preparing a magnetic response enhancing monomer; uniformly mixing each monomer with an initiator; carrying out suspension polymerization on the mixed monomer to prepare resin microspheres; and filtering, washing and drying the resin microspheres. According to the invention, the response characteristic of the functional monomer is kept in a resin microenvironment through the design of a synergistic copolymerization network, the influence of external temperature fluctuation on a color change point is reduced, the resin can provide accurate saturation indication at different environment temperatures, and a polymer skeleton has a protective effect on functional components, so that the service life of the resin is prolonged. The oxidation resistance and the hydrolysis resistance are enhanced.

The invention provides a ratiometric fluorescence sensor, a preparation method thereof and application of the ratiometric fluorescence sensor in histamine detection. The ratiometric fluorescence sensor comprises a methyl red dye loaded terbium-based metal organic framework (MR (at) Tb-MOF), the methyl red dye in the MR (at) Tb-MOF can have a strong characteristic fluorescence emission peak at 390 nm, the terbium-based metal organic framework (Tb-MOF) in the MR (at) Tb-MOF has a strong characteristic fluorescence emission peak at 545 nm, and the Tb-MOF and a fluorescence signal of the methyl red (MR) dye can form a ratio fluorescence sensor. According to the invention, the excellent fluorescence ability of Tb-MOF and the pH sensitive characteristic of methyl red dye are integrated in one system, and high-sensitivity histamine detection is realized.

The application discloses a kind of detection methods for battery grade lithium salt purity, called lithium salt is placed in conical flask stirring dissolution;In the first solution to be measured, drop methyl red-bromocresol green indicator is added, and titrated with hydrochloric acid standard titration solution to wine red;Second solution to be measured, drop phenothalin indicator is added, and titrated with methyl red-bromocresol green indicator to wine red;Finally, the purity percentage of lithium salt is calculated.The detection method of the application can be effectively used for the analysis and detection of battery grade lithium carbonate, lithium hydroxide monohydrate and lithium oxide.Compared with the traditional method, the sample consumption is less, the hydrochloric acid consumption is less, and it is more environmentally friendly.Meanwhile, it can effectively solve the problem that the influence of carbonate ion consumption of hydrochloric acid is not considered in the traditional national standard, thereby improving the accuracy of detection.Meanwhile, the method can also be effectively used for the analysis and detection of battery grade lithium oxide.

The utility model relates to the technical field of ammonia content detection, in particular to an ammonia content detection device for ammonia, which comprises a gas collecting bottle, a communicating device and a four-way valve, purified water dripped with methyl red is filled in the gas collecting bottle, scales are arranged outside the communicating device, and the four-way valve is connected with the communicating device. The gas collecting bottle is communicated with the top end of the communicating device through a treatment pipe, a sealing valve is arranged on the treatment pipe, the bottom end of the communicating device is connected with an outlet of a four-way valve through a connecting pipe, three inlets of the four-way valve are connected with a water pipe, an ammonia gas pipe and a nitrogen gas pipe respectively, a ball valve, a stop valve and a pressure gauge I are arranged on the connecting pipe, and the pressure gauge I is connected with a pressure gauge II. A constant pressure difference valve is arranged on the ammonia gas pipe; according to the ammonia gas detection device, the ammonia gas detection process is more time-saving and labor-saving, the requirement on hardware is lower, the gas pressure can be controlled, and the risk of ammonia gas detection is reduced.

The invention relates to the technical field of oblique mixing quality testing of a lithium battery positive electrode material lithium manganate, in particular to a lithium manganate oblique mixing quality testing method, which comprises the following steps of: taking 1g of mixed lithium manganate material, putting into a 250ml beaker, adding 50ml of purified water and a magnetic stirrer, covering, and stirring on a magnetic stirrer with the rotating speed of 550 for 20 minutes; after standing for 2 minutes, taking supernate, filtering by two layers of filter paper, transferring 10 ml of filtrate into a 250 ml conical flask, adding 40 ml of purified water, firstly adding 2 drops of phenolphthalein, titrating with 0.1001 mol / L hydrochloric acid until the solution is colorless, then adding 2 drops of methyl red, titrating until the solution is orange, boiling for 1 minute, cooling, titrating until the solution is wine red, and filtering to obtain the finished product. Calculating a result according to a formula that the first step of diluted hydrochloric acid is 0.1001 * 0.006941 * 100 * 5 (M + is stored) and the second step of titration consumption is-0.01 * extracted MRC / sample weight; the lithium manganate oblique mixing quality test method is simple and accurate in operation, rapid and efficient, can optimize the process, saves time and labor, improves the test effectiveness and accuracy, and can pre-judge the later material performance to ensure the high quality of lithium manganate.

The invention provides an online analysis method of primary loop boric acid, and belongs to the technical field of boric acid detection. The method comprises the following steps: firstly, diluting a water sample with demineralized water, dropwise adding a methyl red indicator, and carrying out acid solution titration; when acid solution titration reaches a first end point, mannitol and phenolphthalein indicators are added for alkaline solution titration, and when acid solution titration reaches a second end point, a C alkaline solution and a V alkaline solution are recorded; and finally, calculating the concentration of boric acid according to the sampling amount V0 of the water sample, the C alkali solution and the V alkali solution. The two indicators are respectively used in the two continuous titration processes, the indicator added for the first time can indicate the arrival of the first titration end point, and the indicator added for the second time does not interfere with the arrival of the second titration end point indicated by the indicator for the second time. According to the method, for judging the titration end point of methyl red, the design of double light source detection is adopted, and the titration end point of which the pH value is equal to 5.2 + / -0.2 is determined by calculating the absorbance value of the double light sources.