1436 results about "Aqueous medium" patented technology

A production method for an aqueous dispersion according to the present invention comprises polymerizing a first monomer that includes tetrafluoroethylene in the presence of a compound represented by formula (X) and a polymerization initiator under conditions in which an aqueous medium is present but an emulsifier that includes fluorine atoms is substantially absent to produce an aqueous dispersion that includes particles of a first fluorine-containing polymer that has an average particle diameter of no more than 500 nm and does not have a melting point.　Formula (X): C(X1)(X2)=C(X3)-L-Z. In formula (X), X1, X2, and X3 are each independently a hydrogen atom, a fluorine atom, a perfluoromethyl group, or an alkyl group, L is a single bond or a divalent linking group, and Z is an anionic group or a salt of an anionic group.

A fluoroelastomer production method including a step in which monomers A comprising a compound represented by CX1X2=CX3-L-Z, a cyano-group-containing monomer, and at least one compound selected from the group consisting of tetrafluoroethylene, fluorine-containing vinyl ethers, and fluorine-containing allyl ethers are polymerized in an aqueous medium under conditions that substantially no fluorine-atom-containing emulsifier is present.

The invention discloses a perfluoroether raw rubber emulsion as well as a preparation method and application thereof, and particularly provides a preparation method of the perfluoroether raw rubber emulsion, which is characterized by comprising the following steps: (1) in the presence of a water medium, an initiator, an emulsifier and a chain transfer agent, carrying out emulsion polymerization reaction on an initial mixed monomer; (2) continuously supplementing the first-stage mixed monomer into a polymerization reaction system until the total yield of the polymerization reaction is 25-67% of the final yield; the percentage of the final yield is mass percentage; and (3) continuously supplementing the second-stage mixed monomer into the polymerization reaction system until the polymerization reaction accumulates to obtain a final product. Perfluoroether raw rubber further prepared from the perfluoroether raw rubber emulsion prepared by the preparation method has one or more advantages as follows: the perfluoroether raw rubber emulsion is resistant to high temperature, small in permanent compression deformation and good in processability, and rubber obtained after vulcanization of the perfluoroether raw rubber has better performance parameters.

An inkjet ink contains a quinacridone pigment, a pigment dispersion resin, and an aqueous medium. The pigment dispersion resin includes an adsorption resin adsorbed to the quinacridone pigment and a non-adsorption resin not adsorbed to the quinacridone pigment. The non-adsorption resin has a percentage content in the pigment dispersion resin of at least 20% by mass and no greater than 50% by mass. A supernatant obtained by centrifugation of the inkjet ink at 1,050,000 G for 3 hours has a phosphorous concentration of at least 1.0 ppm and no greater than 6.0 ppm. The supernatant has a sulfur concentration of at least 1.0 ppm and no greater than 6.0 ppm.

To provide an aqueous primer composition which has excellent adhesion to an adherend such as aluminum, and can improve adhesion to a porous member and adhesion to an existing sealing material.SOLUTION: An aqueous primer composition containing an organic polymer dispersed in an aqueous medium contains (A) an anionic urethane resin emulsion, and (B) a silyl group-containing acrylic resin emulsion. The aqueous primer composition is suitably usable as a sealing material.SELECTED DRAWING: None

A method for producing a fluoroelastomer is provided by which a fluoropolymer having excellent dispersion stability in water can be efficiently produced using an aqueous medium having a reduced environmental burden and without essentially requiring an emulsifier.　The method for producing a fluoroelastomer comprises polymerizing monomers including TFE and PAVE in an aqueous dispersion that contains substantially no water-soluble emulsifier and comprises an aqueous medium and a first fluoropolymer, which includes TFE units and PAVE units, thereby producing a second fluoropolymer. In the first fluoropolymer, the proportion of the PAVE units to the sum of the TFE units and the PAVE units is 20-95 mol%. In the second fluoropolymer, the proportion of PAVE units to the sum of TFE units and the PAVE units is 20-95 mol%. Before initiation of the polymerization of the monomers, the content of the first fluoropolymer is 0.01-4.0 mass% with respect to the mass of the whole aqueous dispersion.

The present disclosure relates to supported metal catalysts, such as biochar-supported atomically dispersed metal catalysts, and methods of using supported metal catalysts to remove contaminants, such as antibiotics and per- and polyfluoroalkyl substances (PFAS), from aqueous medium.

Adhesive compositions including a multivalent metal salt, an multidentate acidic organic compound, and an aqueous medium are disclosed. The multivalent metal salt and multidentate acidic organic compound can include, as a mixture, a carbonate salt and / or carbonic acid. The aqueous medium can include pH adjusting agent such as sodium hydroxide. The adhesive composition, upon curing, can have a porosity of 10-50%. The adhesive composition, upon curing, can include a plurality of pores. The adhesive composition can be porous, and upon curing can have a plurality of pores having a pore size of between 20 μm to 200 μm. Methods of producing the adhesive composition are disclosed. Methods of using the adhesive composition are further disclosed.

The invention discloses a synthesis method of bromo-triazine, which belongs to the technical field of organic synthesis, and comprises the following steps: preparing an alumina-loaded N, N-dimethylaminopyridine catalyst, filling the alumina-loaded N, N-dimethylaminopyridine catalyst in a fixed bed reactor, introducing tribromophenol and metal oxide mixed slurry and cyanuric chloride slurry, carrying out a reaction for 2-4 hours, and carrying out a reaction for 2-4 hours to obtain the bromo-triazine. Raising the temperature for reaction to obtain a crude product solution; and performing post-treatment to obtain a bromo-triazine product. According to the invention, the aluminum oxide loaded N, N-dimethylaminopyridine catalyst is synthesized, and the N, N-dimethylaminopyridine enables the reaction speed to be higher and the yield to be higher; nano aluminum oxide is adopted for loading, so that on one hand, dealkalization synthesis of bromotriazine is realized, and on the other hand, the reaction efficiency is accelerated; the continuous process realizes non-aqueous medium and low-temperature short-time reaction, so that hydrolysis is further avoided; the aluminum oxide loaded N, N-dimethylaminopyridine catalyst is high in activity and stability, the synthesis method is simplified, and the aluminum oxide loaded N, N-dimethylaminopyridine catalyst is suitable for industrial large-scale production.

The present invention discloses a preparation method of yellow azoxy and azo stilbene dyes. Using 4-nitrotoluene-2-sulfonic acid as a raw material and water as a reaction solvent, in the presence of choline hydroxide, dye yellow 11 is obtained through a condensation reaction. The molecular structure of choline hydroxide contains a quaternary ammonium salt group and a hydroxyl group. The hydroxyl group provides additional hydrophilicity, which helps to improve the solubility and dispersibility of the dye in an aqueous medium and enhance the affinity between the dye and the fiber. Choline hydroxide can effectively provide the alkaline environment required for the reaction, promote the synthesis reaction of the dye, and better control the selectivity and yield of the reaction. Since the choline hydroxide molecule contains a hydroxyl group, it can form hydrogen bonds with the sulfonic acid groups in the dye molecule, enhance the stability between dye molecules, and improve the light fastness and acid and alkali resistance of the dye. Using choline hydroxide not only optimizes the reaction conditions, improves the purity and yield of the dye, but also significantly improves the performance of dye yellow 11.

The invention relates to a method for producing microparticles comprising at least one organic active compound encapsulated by a shell of an organic wall material, the method comprising i. Providing a water-immiscible liquid containing the organic active compound to be encapsulated and at least one first shell-forming compound (SFC1); ii. Emulsifying the water-immiscible liquid obtained in step i. In an aqueous medium to obtain an oil-in-water (o / w) emulsion of the water-immiscible liquid in the aqueous medium; iii. Adding at least one second shell-forming compound (SFC2) to the aqueous medium or to the emulsion obtained in step ii. Prior to or during performing step ii., thereby obtaining an aqueous suspension of the microparticles; wherein the first shell-forming compound (SFC1) or the second shell-forming compound (SFC2) has 1, 2, 3, 4, 5 or 6, in particular 1, 2, 3 or 4, in particular 1, 2 or 3 first reactive groups (RG1) selected from isocyanate groups, isothiocyanate groups, carbonyl halide groups and carboxylic anhydride groups, per molecule, and the other shell-forming compound has 1, 2, 3, 4, 5 or 6, in particular 1, 2, 3 or 4, per molecule, in particular 1, 2 or 3 second reactive groups (RG2) selected from the group consisting of hydroxyl, thiol and primary amino groups, the first shell-forming compound (SFC1) or the second shell-forming compound (SFC2) having only one reactive group and the other shell-forming compound having 1, 2, 3, 4, 5 or 6, in particular 1, 2, 3 or 4, in particular 1, 2 or 3 reactive groups. The invention also relates to microparticles obtainable by this process and to the use thereof.

The invention relates to mussel mucin-hyaluronic acid nanogel and a preparation method and application thereof and a pharmaceutical composition, and belongs to the field of biomedical materials, the structural formula of the mussel mucin-hyaluronic acid nanogel is # imgabs0 #, Mussel mucin is a mussel mucin molecule, and n is the number of repetitive units. The mussel mucin-hyaluronic acid nanogel can be swelled in a water-based medium to form a three-dimensional space net-shaped structure, pharmaceutical active molecules are better entrapped, lysine and dopa groups in the structure can be tightly combined with the surface or mucous membrane of an organism through electrostatic interaction, hydrogen-bond interaction and oxidative crosslinking, so that the bioavailability of the mussel mucin-hyaluronic acid nanogel is improved, and the bioavailability of the mussel mucin-hyaluronic acid nanogel is improved. The carrier has good biological adhesion, can prolong the residence time of the carrier on an organism or mucous membrane surface, and promotes drug absorption. The mussel mucin-hyaluronic acid nanogel can also be used as a drug storage cavern, so that the slow release effect of drugs is improved, the action time of the drugs is prolonged, and the administration frequency is reduced.

A treatment agent and a fiber fabric or coating treated by same. The treatment agent comprises an organic silicon polymer, an emulsifier, and an aqueous medium, wherein the organic silicon polymer comprises a structural unit generated by a monomer I, and the monomer I comprises a silicon monomer I-A and an optional silicon monomer I-B. The treatment agent can simultaneously endow a fiber fabric with good oil and water repellent functions and endow a coating with a good anti-fouling or anti-graffiti capability.

Disclosed herein is an aqueous nucleic acid purification buffer comprising a polar aprotic solvent. Also provided herein are using such purification buffers to precipitate nucleic acids from a solution onto a solid support, thereby providing a solid support that binds to nucleic acids. Also provided herein is a method for treating a nucleic acid comprising exposing a sample comprising the nucleic acid to an aqueous medium comprising a polar aprotic solvent in the presence of a solid support; and precipitating the nucleic acid onto the solid support, thereby providing a solid support that binds to the nucleic acid. Further provided herein are kits and compositions comprising such aqueous nucleic acid purification buffers, as well as related nucleic acid analysis devices, and uses of the kits.

The invention relates to the technical field of inorganic compound preparation, and particularly discloses a method for preparing high-purity iron phosphate through low-temperature acidolysis of phosphated residues, which comprises the following steps: washing, drying and crushing the phosphated residues to obtain phosphated residue powder; carrying out low-temperature acidolysis reaction on the phosphated residue powder and inorganic acid in an aqueous medium at 60-90 DEG C to obtain an acidolysis solution; adding an oxidizing agent into the acidolysis solution, adjusting the pH value of the system to 2.5-4.5 at 65-85 DEG C, carrying out oxidation impurity removal, and filtering to obtain an iron-containing phosphate solution; and selectively supplementing an iron source according to the molar ratio of iron to phosphorus in the solution, adjusting the pH value to 1.0-3.0, and carrying out precipitation reaction at 65-75 DEG C to generate iron phosphate. According to the method, low-energy-consumption resource utilization of the phosphated residues is achieved by combining low-temperature acidolysis with oxidation impurity removal and component regulation and control, the product purity meets the battery-grade requirement, and the method is suitable for preparing the lithium battery positive electrode material precursor.

The invention discloses a method for removing oligomers on the surface of a polyester fiber product, which comprises the following steps: adding the polyester fiber product into water, adding 0.1-10g of nonionic surfactant with the HLB (Hydrophile-Lipophile Balance) value of less than 10 according to 1L of water, cleaning for 5-30 minutes at 15-60 DEG C, then discharging liquid, adding the polyester fiber product into a non-aqueous medium, cleaning for 5-15 minutes at 15-50 DEG C, then discharging liquid, washing for 5-15 minutes at 15-50 DEG C, and drying to obtain the polyester fiber product. The non-aqueous medium is selected from at least one of tetrachloroethylene, n-butyl acetate, gamma-butyrolactone, epsilon-caprolactone and 1, 4-dioxane; and taking out the cleaned polyester fiber product, and putting the polyester fiber product into a dryer provided with a condensation recovery device for sealed drying. Experiments prove that the method not only can effectively remove the oligomer on the surface of the polyester fiber product, but also is simple to operate and easy to realize large-scale production, and has the advantages of low cost, high efficiency, environmental protection and the like, and the waste liquid can be recycled.

An inkjet recording ink includes: a pigment; a binder resin particle; and an aqueous medium. The aqueous medium includes glycolether, a specific organic solvent, and water. The specific organic solvent is a glycol compound having 3 or more and 6 or less carbon atoms. A content ratio of the specific organic solvent is 27.5 mass % or more and 35.5 mass % or less. Shear viscosity of the inkjet recording ink measured at a temperature of 32° C. and a shear rate of 105 s−1 is 5.5 mPa·s or more and 7.0 mPa·s or less. A drying rate of the inkjet recording ink is 20% or more and 40% or less.

An object of the present invention is to provide an aqueous dispersion composition containing polyester resin having high storage stability, film-forming properties, tackiness, adhesiveness, and water resistance. An aqueous dispersion composition containing polyester resin, comprises, a polyester resin (A), a coalescing aid (B), and an aqueous medium (C), wherein the coalescing aid (B) has a Hansen solubility parameter with a dispersion term (δd) of 15.4 MPa0.5 or more and less than 18.0 MPa0.5, a polarization term (δp) of 4.1 MPa0.5 or more and less than 9.1 MPa0.5, and a hydrogen bond term (δh) of 7.0 MPa0.5 or more and less than 12.3 MPa0.5.

Provided is a water repellent composition containing a polymer (A), a polyether-modified polydimethylsiloxane (B), and an aqueous medium (C). The polymer (A) contains a repeating unit derived from a monomer (a1) represented by the formula CH2=C(-R11)-C(=O)-R12 (in the formula, R11 is a hydrogen atom or a methyl group and R12 is a C9-40 hydrocarbon group.).

The invention relates to self-curing keratin 3D printing ink integrated with shear activation microcapsules and a preparation method of the self-curing keratin 3D printing ink, and belongs to the technical field of biological 3D printing and intelligent materials.The preparation method comprises the steps that high-molecular-weight soluble keratin powder is dissolved in a biocompatible water-based medium with the pH being 6.5-8.5, and after even mixing and defoaming are conducted, a keratin base solution is obtained; wrapping the core material in a corresponding shell to obtain a microcapsule with the average particle size of 1-10 microns; under the stirring condition, the microcapsules are evenly dispersed into a keratin base solution at the temperature of 0-8 DEG C until a uniform suspension system is formed, and the self-curing keratin 3D printing ink integrating the shear activation microcapsules is obtained. And the curing process of the ink is internalized in the printing behavior, so that the printing process is simplified, and the equipment cost and the operation difficulty are reduced. The cross-linking agent is effectively isolated, so that the ink can be stably stored for several weeks before printing without gelling, and the problem that double-component ink must be immediately used after being mixed is solved.

An inkjet ink includes: a quinacridone pigment; a pigment coating resin; and an aqueous medium. The pigment coating resin includes an adsorbed resin that is adsorbed on the quinacridone pigment and an unadsorbed resin that is not adsorbed on the quinacridone pigment. A ratio of the unadsorbed resin to the pigment coating resin is 18 mass % or more and 52 mass % or less. A phosphorus concentration in a supernatant liquid is 1.0 ppm or more and 12.5 ppm or less, the supernatant liquid being obtained by centrifuging the inkjet ink at 1,050,000 G for 3 hours. A sulfur concentration in the supernatant liquid is 1.0 ppm or more and 12.5 ppm or less. Absorbance of a first peak in an ultraviolet-visible light absorption spectrum of a 25-fold diluted solution of the supernatant liquid is 0.010 or less.

The present invention relates to a process for the preparation of substituted 4-(N′-hydroxy-carbamimidoyl)benzoic acids, which can be obtained by nitrilase catalyzed hydration of substituted terephthalonitriles of formula (II) in an aqueous medium to afford (ammonium) 4-cyanobenzoic acids (IIa). The hydration is followed by treatment of the aqueous reaction medium with hydroxylamine or a salt thereof to afford amidoximes (I).

The invention relates to a process for moving a droplet from a first location to a second location, which droplet comprises a magnetic material disposed in an aqueous medium. The invention also relates to a droplet assembly comprising a droplet, which droplet comprises a magnetic material disposed in an aqueous medium. Various uses of the droplet assembly are also described.

The invention relates to a composition in powder form, comprising an alkaline earth metal peroxide, alkalophilic or alkalotolerant aerobic saprophytic microorganisms, nutritive ingredients for these microorganisms, and optionally a base; and a solution as well as microspheres, their preparation processes and their uses in the decontamination of environments such as soils and aqueous media. figure for abstract: no figure

A method for producing modified polytetrafluoroethylene including: polymerizing tetrafluoroethylene and a modifying monomer in an aqueous medium in the presence of a polymer (I) containing a polymerization unit (I) based on a monomer represented by the following general formula (I) to obtain a modified polytetrafluoroethylene:wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more. Also disclosed is a composition containing the modified polytetrafluoroethylene and the polymer (I).