10 results about "Dimethylurea" patented technology

The invention belongs to the technical field of coating protection, and particularly relates to a preparation method of a single-component high-temperature fast curing silver-aluminum polymer coating applied to the surface of a coating layer. Comprising 175-180 parts of modified epoxy resin; 95 to 100 parts of flaky aluminum silver powder; 180-200 parts of a mixed solvent of dimethylbenzene and / n-butyl alcohol; 100 to 120 parts of dicyandiamide; 25 to 40 parts of 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea; 10 to 12 parts of sodium molybdate; 4-8 parts of graphite; 1 to 2 parts of polydimethylsiloxane; 2 to 6 parts of a wetting agent HY-352; 3-5 parts of fumed silica; 0.5 to 3 parts of dimethyl silicone oil; and 0.2-2 parts of a hydroxymethyl cellulose agent. The coating disclosed by the invention has the advantages of thin coating, high-temperature rapid curing, relatively good corrosion resistance, good combination with a coating layer and the like, and also has excellent storage stability.

The application discloses a kind of polymer solid electrolyte and preparation method and application thereof, belong to solid-state battery technical field, including, PVDF-HFP, plasticizer are dissolved in organic solvent to form homogeneous solution;Lithium salt and 1,3-dimethyl urea are added to homogeneous solution, stirring is dissolved at room temperature, after defoaming treatment, drop coating is carried out on glass plate, glue liquid is evenly coated, solvent is removed by drying, and polymer solid electrolyte is obtained.The application provides a kind of preparation method of polymer solid electrolyte, the addition of DMU (1,3-dimethyl urea) provides a way for further dissociation of lithium salt in polymer solid electrolyte, and promote the generation of inorganic matter with high ionic conductivity and good mechanical properties, better inhibit the growth of lithium dendrite, enhance interface stability, so as to improve lithium metal cycle stability and prolong battery life.

This invention discloses a method for extracting the effective components of Polygonum multiflorum based on a eutectic solvent system. The method involves dissolving Polygonum multiflorum powder in a eutectic solvent and then extracting it using ultrasound to obtain the effective components. The eutectic solvent includes hydrogen bond donor compounds and hydrogen bond acceptor compounds. The hydrogen bond donor compounds include one or more of xylitol, sorbitol, ethylene glycol, levulinic acid, DL-malic acid, urea, N,N'-dimethylurea, acetamide, glycerol, citric acid, oxalic acid, methylurea, or malonic acid. The hydrogen bond acceptor compounds include one or more of choline chloride, betaine, proline, levulinic acid, glycerol, citric acid, or ethylene glycol. This invention synthesizes various eutectic solvents and systematically investigates their extraction and transformation effects on the effective components of Polygonum multiflorum. These extraction solvents are green, biodegradable, and have great application prospects. They can effectively reduce hepatotoxic components in Polygonum multiflorum and improve the extraction efficiency of its effective components.

The invention discloses a ternary eutectic solvent and a method for separating and extracting tea saponin in waste camellia seed shells, and the ternary eutectic solvent is composed of betaine, N, N-dimethylurea and propylene glycol. The ternary eutectic solvent and the camellia seed shell powder are heated and stirred, and the tea saponin in the camellia seed shells is efficiently extracted through the strong hydrogen-bond interaction of the ternary eutectic solvent and the camellia seed shell powder. The yield of the tea saponin can reach 150.0 mg / g to the maximum. The solvent used for preparation is environment-friendly, the process is simple and convenient, the operation is easy, and the treatment efficiency is high. The method can provide an efficient solution for efficiently utilizing and extracting tea saponin from the camellia seed shells which are greatly wasted in the camellia oleifera industry in China, and has a good industrial application prospect.

This invention provides a method for separating magnolol and honokiol, relating to the field of separation technology. The invention involves mixing total magnolol (including magnolol and honokiol) with an organic solvent; extracting the resulting organic phase solution using an extractant (an aqueous solution of 1,3-dimethylurea) to obtain an organic phase (including magnolol and the organic solvent) and an aqueous phase (including honokiol and the extractant). This invention is the first to utilize a single extractant and hydrogen-bonded molecular recognition mechanism to achieve highly selective separation of magnolol isomers. Furthermore, by integrating multi-stage extraction and variable-concentration back-extraction, the purity and recovery rate of magnolol and honokiol can both reach over 99%. The entire process operates under mild conditions, is energy-efficient and economical, and ensures the activity and stability of the product. Through concentration, complete recovery and recycling of the extractant and process water are achieved, realizing a closed-loop cycle that is environmentally friendly.

A method for increasing the volume of keratin fibers is described. The method for increasing the volume of keratin fibers comprises the steps of: (i) treating the keratin fibers by topical application of a cosmetic composition comprising, in a cosmetically acceptable medium: (a) at least urea and / or an urea derivative selected from N,N-dimethylurea, N- (2-hydroxyethyl)urea, N-(3-hydroxypropyl)urea, N-(2-hydroxypropyl)urea, N- (2-hydroxy-2-methyl-prop-2-yl)urea, N-(1,3-dihydroxy-2-methyl-prop-2- yl)urea, N-(1,3-dihydroxy-2-hydroxymethyl-prop-2-yl)urea, and mixtures thereof; and (b) at least one film-forming amino-silicone polymer selected from Polysilicone-35, Polysilicone-33, Polysilicone-29, and mixtures thereof; (ii) allowing the composition to remain in contact with the keratin fibers for a period ranging from about 5 s to about 96 h. This method increases the volume of keratin fibers, in particular human hair, without leaving the hair stiff or sticky, without leaving substantial adhesion between the hair fibers while maintaining the improvement in the volume of hair after washing it with a shampoo.

The utility model relates to the technical field of ultramicro powder grinding equipment, in particular to ultramicro powder grinding equipment of N-p-chlorphenyl-N ', N'-dimethylurea, which comprises a feeding device, a coarse powder grinding driving device, a coarse powder grinding device, a coarse powder container, an airflow crushing device, an ultramicro powder container, a feeding device and a mixing device, the feeding device feeds blocky crystals into the coarse powdering device, the coarse powdering driving device performs coarse powdering on the blocky crystals in the coarse powdering device, obtained coarse powder is fed into the coarse powder container, the coarse powder in the coarse powder container enters the airflow crushing device to be crushed to obtain superfine powder, and the superfine powder falls into the superfine powder container; the superfine powder in the superfine powder container and the anti-caking agent in the feeding device are mixed in the mixing device to obtain a superfine powder-ground N-p-chlorphenyl-N ', N'-dimethylurea powder product; according to the equipment, the ultra-micro powdering of N-p-chlorphenyl-N ', N'-dimethylurea has feasibility, meanwhile, the materials are controlled to be at low temperature in the ultra-micro powdering process, and the stability of the materials is guaranteed.

Provided are methods for transducing a molecule(s) of interest into a cell, comprising a step of contacting the cell with the molecule(s) of interest and a solution for transduction, the solution for transduction containing: at least one of the following (A1) to (A5); and (B) a salt: (A1) a compound represented by formula (I) excluding a predetermined compound, or a salt thereof; (A2) a compound represented by formula (II), or a salt thereof; (A3) a nucleic-acid base or the like, or a salt thereof; (A4) a compound represented by formula (III), or a salt thereof, excluding malic acid; and (A5) at least one selected from the group consisting of creatinine, hydroxyproline, 1,3-butanediol, trientine, D-cellobiose, 1,3-dimethylurea, pantolactone and trimethadione, or a salt thereof.

The invention relates to the technical field of synthesis of fluorine-containing heterocyclic compounds, and discloses a preparation method of 3-phthalimido-2, 2-difluoropropionic acid, which comprises the following steps: reacting phthalimide potassium salt, 3-halo-2, 2-difluoropropionate, polyamine organic alkali serving as a synergistic activator and N, N-dimethylformamide serving as a structural stable factor in a solvent to prepare 3-phthalimido-2, 2-difluoropropionic acid, thereby obtaining the 3-phthalimido-2, 2-difluoropropionic acid. The method comprises the following steps: putting N, N '-dimethylurea into an aprotic polar solvent containing cyclic organic carbonate to construct a heterogeneous reaction system; a reaction system is controlled to be subjected to a nucleophilic substitution reaction, an intermolecular hydrogen bond association body is formed by using a structure stable factor and two symmetrical carbonyl oxygen atoms of a phthalimide anion, a nucleophilic attack path of the anion to a self heterocyclic skeleton is blocked, and a target product is obtained through acidic hydrolysis after an intermediate is generated. Through an intermolecular precise charge shielding mechanism, the contradiction between activity and stability in the nucleophilic substitution process is solved, the ring-opening side reaction is inhibited, and the product purity is improved.

The present invention relates to a new method for the purification of substituted phenylurea derivatives, in particular of 3-(3,4-dichlorophenyl)-1,1-dimethylurea.