50 results about "Cationic polyelectrolytes" patented technology

The present invention is drawn to an adhesive or binder composition comprising, —a cationic polyelectrolyte, —an anionic polyelectrolyte, —a mineral salt selected from the group consisting of alkaline metal or alkaline earth metal halogenides, —a particulate mineral filler, —a water-soluble polyphenol comprising at least one polyhydroxylated aromatic ring structure, and —water It is also drawn to the use of such a composition as an adhesive, binder, coating or sealant in the construction industry.

The invention provides a single-layer core-shell structure polishing abrasive for silicon carbide wafer polishing, a polishing solution, a preparation method and a polishing method, and relates to the technical field of chemical mechanical polishing, the single-layer core-shell structure polishing abrasive takes silicon dioxide with the particle size of 300-800 nm as an inner core and aluminum oxide with the particle size of 10-150 nm as an outer shell, the particle size ratio of the inner core to the outer shell is 2: 1-10: 1, and the polishing solution is prepared from silicon dioxide with the particle size of 300-800 nm and aluminum oxide with the particle size of 10-150 nm. And single-layer coating is realized through cationic polyelectrolyte assisted electrostatic adsorption. The polishing solution comprises the following components in parts by weight: 3-15 parts of a polishing abrasive with a single-layer core-shell structure, 0.2-8 parts of an oxidizing agent, 0.1-8 parts of a dispersing agent and the balance of deionized water, and the pH value is adjusted to 8-11. The hardness of the inner core abrasive material of the prepared polishing abrasive material with the core-shell structure is smaller than that of the outer shell abrasive material, the polishing abrasive material with the core-shell structure has high dispersity and low agglomeration rate, in the final polishing process of SiC wafers, the surface roughness Ra smaller than or equal to 0.15 nm can be obtained, meanwhile, the material removal rate is kept to be larger than or equal to 1500 nm / h, the scratch density is remarkably reduced, and the polishing abrasive material is suitable for batch finish machining of high-end power device substrates.

The invention relates to the fields of polyelectrolyte, reversed-phase colloid dispersion systems, nanoreactors, nanocrystals and the like, in particular to zinc cadmium sulfide nanocrystals prepared by taking a polyelectrolyte complex as a nanoreactor and a preparation method of the zinc cadmium sulfide nanocrystals. Carrying out ultrasonic treatment on the anionic polyelectrolyte and a solvent to form a reversed-phase miniemulsion colloid, then adding a soluble salt solution containing target metal ions, and continuously carrying out ultrasonic treatment to obtain an anionic polyelectrolyte reversed-phase miniemulsion colloid containing the target metal ions; performing ultrasonic treatment on the cationic polyelectrolyte and the solvent to form a reversed-phase miniemulsion colloid; adding a soluble sulfide solution, and performing ultrasonic treatment to obtain sulfide-containing cationic polyelectrolyte reversed-phase miniemulsion colloid; and mixing the two reversed-phase miniemulsion colloids, carrying out high-pressure nanocrystallization, putting the obtained product into a high-pressure reaction kettle, transferring the high-pressure reaction kettle to a drying oven, carrying out solvent heat treatment to obtain zinc cadmium sulfide nanocrystals with the size of 2-5 nanometers, and uniformly distributing the nanocrystals in the polyelectrolyte complex.

Disclosed is a cosmetic composition which is in the form of an emulsion of water-in-oil type including, per 100% of its mass: from 60% to 95% by mass of a gelled aqueous phase including at least one crosslinked cationic polyelectrolyte; from 5% to 40% by mass of a fatty phase including at least one oil and an emulsifying system including a combination of at least one emulsifying surfactant selected from the elements of the group consisting of compositions of alkylpolyglycosides, compositions of alkylpolyglycosides and of fatty alcohols, polyglycerol esters, alkoxylated polyglycerol esters, polyglycol polyhydroxystearates, polyglycerol polyhydroxystearates, and alkoxylated polyglycerol polyhydroxystearates.

The application provides a layer-by-layer self-assembly nanofiltration membrane, a preparation method and application thereof. The layer-by-layer self-assembly nanofiltration membrane comprises a base film and a self-assembly coating layer formed on the base film, wherein the self-assembly coating layer comprises at least a starting alternating coating layer and a separation alternating coating layer; the molecular weight cut-off of the base film is not less than 500 kDa; the starting alternating coating layer is alternately assembled by a high-molecular-weight cationic polyelectrolyte layer and an anionic polyelectrolyte layer; the separation alternating coating layer is alternately assembled by a low-molecular-weight cationic polyelectrolyte layer and an anionic polyelectrolyte layer; the starting alternating coating layer is formed on the base film, and the high-molecular-weight cationic polyelectrolyte layer in the starting alternating coating layer adopts a cationic polyelectrolyte with a number-average molecular weight of not less than 500 kDa; and the low-molecular-weight cationic polyelectrolyte layer in the separation alternating coating layer adopts a cationic polyelectrolyte with a number-average molecular weight of not more than 100 kDa. The layer-by-layer self-assembly nanofiltration membrane has more excellent permeability and micro-pollutant rejection rate.

This invention relates to a method for preparing a salt-induced degradation type low-pressure modified reverse osmosis membrane and its application in the concentration of seawater desalination reverse osmosis concentrate. The method for preparing the modified reverse osmosis membrane includes the following steps: (1) pretreatment before membrane preparation, followed by natural drainage for later use; (2) low-pressure chemical activation modification, followed by compressed air drying for later use; (3) coating with a first layer of anionic polyelectrolyte to form a dense anionic substrate; (4) secondary oxidation modification to strengthen the interfacial bonding strength between the polyelectrolyte coating and the base membrane; (5) coating with cationic polyelectrolyte to construct a cationic functional interlayer; (6) secondary anionic polyelectrolyte coating to construct an anionic-cationic-anionic three-layer composite charged functional coating, thereby obtaining a controllable retention type modified reverse osmosis membrane. The preparation process of this invention is simple, the raw material cost is low, and it has good engineering applicability, making it suitable for the resource enrichment and treatment of seawater desalination reverse osmosis concentrate.

The present invention relates to a textile comprising textile fibers and a non-crosslinked polymeric binder that is insoluble in water, said polymeric binder comprising a solid polyelectrolyte complex formed of an anionic polyelectrolyte and a cationic polyelectrolyte. The invention also relates to a process for manufacturing such a textile and to a method for recycling such a textile.

This invention belongs to the field of pipeline anti-corrosion coating technology, specifically relating to a heteropolyacid intercalated graphene oxide-epoxy anti-corrosion coating and its preparation method. The heteropolyacid intercalated graphene oxide-epoxy anti-corrosion coating, by weight percentage, comprises the following components: 40-60% epoxy resin, 0.5-3% heteropolyacid intercalated graphene oxide nano-inorganic filler, 10-20% epoxy curing agent, 0.3-1.5% dispersant, and 22.5-38.5% solvent. This invention utilizes the electrostatic bridging effect of cationic polyelectrolytes to obtain an electrostatically assembled material of heteropolyacid and graphene oxide, achieving a synergistic effect of physical barrier and chemical corrosion protection. Combined with the excellent adhesion and chemical corrosion resistance of epoxy resin, the prepared epoxy coating exhibits good density, strong adhesion, and excellent resistance to salt spray and acidic media corrosion, enabling it to adapt to the complex service environment of pipelines for extended periods.

The invention discloses a preparation method and application of a high-dispersity cationic nano sheet covalent organic framework material based on quaternary ammonium salinization. The method comprises the following steps: firstly, successfully synthesizing COF powder by adopting an amino monomer (such as 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine (TAPT) and the like) and an aldehyde monomer (such as 2, 5-dihydroxy terephthalaldehyde (DHTA)) through Schiff base reaction, and then carrying out a reaction on the COF powder and a quaternary ammonium salinization reagent (such as 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTAC)) to obtain a quaternary ammonium salt product. According to the preparation method, a cationic nano-sheet-shaped COF material with good dispersibility is prepared by taking a reaction in an alkaline solution for quaternization modification and combining with an ultrasonic method, and the nano-sheet is a nano-sheet-shaped cationic polyelectrolyte material with a nano-sheet layer structure and high charge characteristics, is expected to be applied to fiber flocculation and complex water treatment, and has a wide application prospect. And a new scheme is provided for sewage treatment in papermaking industry and chemical industry.

The present invention relates to a coating composition comprising a coacervate including a cationic polyelectrolyte and an anionic polyelectrolyte, ceramic particles, and water. It also relates to a method for forming a coating using such a composition, and a coating obtained by such a method.

The present invention belongs to the technical field of wood composite materials, and relates to flexible veneer, flexible wood-based triboelectric materials, and preparation methods and applications thereof. In view of the technical problems in the prior art that wood-based triboelectric materials lack flexibility, are difficult to adapt to complex usage environments, and have poor electrical performance, the present application provides a method for preparing flexible veneer, comprising the following steps: S1: slicing wood along the fiber direction of the wood to obtain slicing veneer; S2: delignifying the slicing veneer to obtain delignified veneer; S3: immersing the delignified veneer in cationic polyelectrolyte and anionic polyelectrolyte solutions in turn, removing the unreacted polyelectrolyte solution, and then immersing it in a crosslinker solution to obtain crosslinked veneer; S4: placing the crosslinked veneer in a MXene solution, removing the unreacted MXene, and drying to obtain flexible veneer. The prepared flexible veneer can be used for the preparation of flexible wood-based triboelectric materials, taking into account both mechanical properties and triboelectric properties.

A composition can comprise a cationic polyelectrolyte, an anionic polyelectrolyte, boron nitride particles, a polymer having a glass transition temperature of lower than 50° C.; and water, wherein an amount of the boron nitride particles is at least 55 wt % based on a total dry weight of the composition. The composition can be used in a process of forming a coating, wherein the coating may contain boron nitride particles of up to 90 wt % and have a thermal conductivity of up to greater than 30 W / mK.

The invention relates to the technical field of biology, and discloses a polyelectrolyte aggregate water-in-water emulsion and a preparation method thereof.The preparation method comprises the following steps that a solution A and a third component solution are compounded to obtain a solution B, and the pH value is adjusted to range from 4.0 to 6.0; adding a cationic polyelectrolyte solution into the solution B to obtain a polyelectrolyte aggregate water-in-water emulsion; the cationic polyelectrolyte is chitosan oligosaccharide or chitosan salt, and the deacetylation degree is 30%-95%; the solution A is an anionic polyelectrolyte solution or a blended solution of the anionic polyelectrolyte solution and an auxiliary additive component solution. According to the preparation method of the polyelectrolyte aggregate water-in-water emulsion, the deacetylation degree is used as a core single regulation factor, the electrostatic interaction strength of chitosan oligosaccharide and polyacrylic acid is precisely regulated, and the process is simple.

The application discloses a polyelectrolyte double-network hydrogel for bacterial infection wound healing and a preparation method and application thereof, and constructs a polyelectrolyte double-network hydrogel by introducing a quaternary ammonium salt modified chitosan cationic polyelectrolyte into a propylene monomer-co-sulfonate anion copolymer, wherein the quaternary ammonium carboxymethyl chitosan cationic polyelectrolyte is used as a first network, and the poly(propylene monomer-co-sulfonate) anionic polymer is used as a second network; the two polymer networks with opposite charges strongly interact with each other, and the mechanical property, the adhesion property and the antibacterial property of the polyelectrolyte double-network hydrogel are synergistically improved.

The embodiment of the invention discloses a muddy water treatment system and a muddy water treatment method. The muddy water treatment system comprises a sedimentation tank, a potential mixer, a water pump, a first dosing unit and an ultrafiltration unit, the settling pond is used for settling suspended matters in water; the potential mixer is communicated with the sedimentation tank and is used for mixing fluid and total solids in the potential mixer; the water pump is used for conveying clear liquid containing particles and colloids in the sedimentation tank into the potential mixer; the first dosing unit is communicated with the potential mixer, and the first dosing unit is used for adding cationic polyelectrolyte into the potential mixer; the ultrafiltration unit is communicated with the potential mixer and comprises a hollow fiber ultrafiltration membrane, and the hollow fiber ultrafiltration membrane is used for performing cross-flow filtration on liquid entering the ultrafiltration unit. According to the muddy water treatment system and the muddy water treatment method disclosed by the embodiment of the invention, fine particles and colloidal substances can be effectively prevented from being blocked or adsorbed in membrane holes and inlets, so that membrane pollution is relieved fundamentally.

The invention discloses a preparation method of a halloysite nanotube-polyvinyl alcohol cross-linked composite aerogel modified by electrostatic self-assembly, comprising the steps of: in an electrostatic assembly mode, surface modification of halloysite nanotubes is performed using a cationic polyelectrolyte to obtain a modified halloysite nanotube having a positive zeta potential; in an electrostatic assembly mode, negatively charged phytic acid is modified on the surface of the modified halloysite nanotube having a positive zeta potential to obtain a phytic acid-functionalized halloysite nanotube; under alkaline conditions, using 1,3-diepoxybutane as a cross-linking agent, a three-dimensional network structure is formed by cross-linking reaction of polyvinyl alcohol and phytic acid-functionalized halloysite nanotubes, and finally the reaction solution is freeze-dried, and then the alkaline substance is removed to obtain an electrostatic self-assembly modified halloysite nanotube-polyvinyl alcohol cross-linked composite aerogel. The present invention solves the problem that polyvinyl alcohol easily remains in the solution and that halloysite nanotubes are not easily recycled and reused, and improves the adsorption performance of heavy metal ions by synergistic enhancement.

The invention provides an anticorrosive coating for a marine environment and a preparation method thereof, the anticorrosive coating comprises a modified glass flake, a coating matrix and a curing agent, the modified glass flake comprises a glass flake and a multilayer film, the multilayer film is formed by a cationic polyelectrolyte layer and an anionic polyelectrolyte layer which are alternately deposited on the surface of the glass flake, a corrosion inhibitor is embedded between each cationic polyelectrolyte layer and each anionic polyelectrolyte layer, and the cationic polyelectrolyte layers are cross-linked and cured by adopting a cross-linking agent after the corrosion inhibitor is embedded. The invention aims to solve the problems of weak interface bonding, high corrosion inhibitor leakage rate and insensitive trigger release of the traditional marine anticorrosive paint. A multi-layer polyelectrolyte membrane-corrosion inhibitor composite structure is constructed on the surface of a glass flake through an electrostatic layer-by-layer self-assembly technology, accurate on-demand release of a corrosion inhibitor is achieved, meanwhile, the interface bonding force and corrosion resistance of a coating are remarkably improved, and the problem of rapid pitting diffusion of local damage of traditional anticorrosive paint is solved.

Described herein are methods for reducing or preventing blood flow in a neurovascular blood vessel of a subject. The method involves injecting a composition composed of water, one or more polycationic polyelectrolytes and anionic counterions, one or more one polyanionic polyelectrolytes and cationic counterions, and a statin, an anti-cancer agent, or a combination thereof, wherein the composition has an ion concentration that is (i) sufficient to prevent association of the polycationic polyelectrolytes and the polyanionic polyelectrolytes in water and (ii) greater than the concentration of ions in the subject. Upon introduction of the composition into a subject, a solid is produced in situ. The injectable compositions have unique distal penetration properties, which make the injectable compositions described herein very useful as embolics for neurovascular blood vessels.

The invention discloses an intelligent response type marine antirust agent composition as well as a preparation method and application thereof. The intelligent response type marine antirust agent composition comprises a solvent and the following components in parts by mass: 6-8 parts of ion response microcapsules, 6-8 parts of photo-thermal response microcapsules, 6-9 parts of benzotriazole covalent grafting modified functionalized graphene oxide and 34-38 parts of film-forming resin, a capsule core of the ion response microcapsule is a corrosion inhibitor; the capsule wall is a polyelectrolyte composite membrane formed by self-assembling cationic polyelectrolyte and anionic polyelectrolyte layer by layer, and the outer surface of the capsule wall further comprises an inorganic nanoparticle layer formed by biomimetic mineralization; the cationic polyelectrolyte is poly (diallyldimethylammonium chloride), the anionic polyelectrolyte is sodium polystyrenesulfonate, and the inorganic nanoparticles are calcium carbonate; the photo-thermal response microcapsule comprises a capsule core which is a mixture of CsPbBr and n-octacosane, and a capsule wall which is polyurea formaldehyde.

The invention provides an incubation-free composite SERS (Surface Enhanced Raman Scattering) substrate as well as a preparation method and application thereof. The preparation method comprises the following steps: providing Ag nanoparticles; providing a nano carbon material, and loading the Ag nanoparticles on the surface of the nano carbon material to form an SERS solution system with a composite nano structure; loading a cationic polyelectrolyte structure on the surface of the nanofiber membrane to obtain a composite fiber membrane; the SERS solution system is dripped onto the composite fiber membrane, and the incubation-free composite SERS substrate is obtained. The detection efficiency and sensitivity of the sulfonamide antibiotics can be remarkably improved, and the application prospect is wide.

The invention discloses an artificial cell and a preparation method thereof as well as a bionic tissue and a preparation method thereof, an aqueous dispersion of a negative electricity nanometer material is sprayed into an aqueous phase receiving bath containing a cationic polyelectrolyte and a surfactant through a gas-liquid shearing microfluidic technology, and one-step construction of an artificial cell membrane and a cytoskeleton is realized. According to the method, the internal skeleton enhanced artificial cell is constructed in a water phase by a one-step method by utilizing the electrostatic interaction of the negative electricity nano material and the cationic polyelectrolyte, and the method has the characteristics of convenience in preparation and excellent stability. By introducing different functional materials, multifunctional integration of the artificial cell can be realized. Meanwhile, the adhesion inducer is added, so that a bionic tissue can be further constructed, and the bionic tissue integrates excellent mechanical properties of the artificial cells and can bear disturbance to a certain degree without disintegration.

The invention relates to a post-treatment method of a reverse osmosis membrane and a reverse osmosis membrane product. The post-treatment method of the reverse osmosis membrane comprises the following steps: carrying out alkali etching treatment on the surface of a semi-finished reverse osmosis membrane which is based on a polyolefin substrate and is not applied with a packaging protection layer, so as to obtain the semi-finished reverse osmosis membrane subjected to alkali etching treatment; and alternately depositing a cationic polyelectrolyte layer and an anionic polyelectrolyte layer on the surface of the semi-finished reverse osmosis membrane subjected to alkali etching treatment to form a polyelectrolyte multi-layer composite structure. According to the post-treatment method of the reverse osmosis membrane, the semi-finished reverse osmosis membrane based on the polyolefin substrate is subjected to alkali etching treatment and polyelectrolyte alternate deposition treatment, and compared with an untreated semi-finished reverse osmosis membrane, the semi-finished reverse osmosis membrane can be efficiently treated through the synergistic effect of strong alkali etching activation and polyelectrolyte alternate deposition functionalization; the desalination rate, the permeation flux and the anti-pollution performance of the membrane are synchronously improved.

The present invention relates to a coating composition comprising a coacervate comprising a cationic polyelectrolyte and an anionic polyelectrolyte, ceramic particles, and water. It also relates to a process for forming a coating using such composition, and to a coating obtained by such process.

The present invention relates to a method for sealing a leaking underground structure comprising: i) injecting a composition into a water leak of the leaking underground structure, and ii) contacting said composition with water of the water leak, wherein said composition comprises a cationic polyelectrolyte, an anionic polyelectrolyte, a water-soluble mineral salt, and water.

The invention relates to the technical field of perovskite solar cells, in particular to a perovskite solar cell electron transport layer based on a cationic polyelectrolyte additive and a preparation method and application of the perovskite solar cell electron transport layer. The preparation method comprises the following steps: adding a cationic polyelectrolyte additive into a PCBM electron transport material solution, and stirring to obtain an electron transport material solution containing the cationic polyelectrolyte additive; and coating the perovskite light absorption layer with an electron transport material solution containing the cationic polyelectrolyte to prepare the perovskite solar cell electron transport layer based on the cationic polyelectrolyte additive. Wherein the cationic polyelectrolyte additive is one of polyvinyl pyridine, polyvinyl alcohol, polyethyleneimine, polyesteramide, polyacrylamide and polyethylene amide. According to the invention, perovskite defects can be passivated, the device efficiency is improved, the process complexity and the manufacturing cost are reduced, and a new way is provided for preparing a large-area solar cell.

The application provides a CuS / diatomite composite adsorbent and a preparation method and application thereof, and belongs to the technical field of adsorbent preparation. First, a strong cation polyelectrolyte is used to pre-modify the surface charge of diatomite, and then a layer of CuS nanosheet with S 2‑ active groups is in-situ grown on the surface of the modified diatomite through a low-temperature water bath reaction to obtain a CuS / diatomite composite adsorbent. The adsorbent preparation method is simple, the conditions are mild, the raw material cost is low, the CuS nanoparticles are uniformly loaded on the surface of the diatomite, the prepared CuS / diatomite composite adsorbent well retains the macroporous structure of the diatomite, and the adsorption capacity of the adsorbent for heavy metal silver ions is significantly improved.

A composition can comprise a cationic polyelectrolyte, an anionic polyelectrolyte, boron nitride particles, a polymer having a glass transition temperature of lower than 50°C; and water, wherein an amount of the boron nitride particles is at least 55 wt% based on a total dry weight of the composition. The composition can be used in a process of forming a coating, wherein the coating may contain boron nitride particles of up to 90 wt% and have a thermal conductivity of up to greater than 30 W / mK.

The invention provides aramid precipitation nanofiber reinforced aramid insulation paper and a preparation method thereof, and belongs to the technical field of preparation of aramid insulation paper. The aramid precipitation nanofibers are added when the insulating paper is prepared, pores between the aramid chopped fibers and the aramid precipitation fibers can be filled, so that the aramid chopped fibers and the aramid precipitation fibers are fully adhered and interwoven, the tensile strength of the aramid insulating paper is improved, and the insulativity of the insulating paper is improved; the cationic polyelectrolyte and the anionic polyelectrolyte are added in the wet-process paper forming process and can form a binary retention and drainage aid, loss of aramid precipitation nanofibers in the paper preparation process can be reduced in the wet-process paper forming process, and then the mechanical property and insulativity of the aramid insulation paper are improved.

The invention provides a moisture power generation fiber as well as a preparation method and application thereof. The moisture power generation fiber is formed by alternately arranging first areas and second areas along a fiber axis in a spiral form, the first region comprises a cationic polyelectrolyte and an electrode; the second region comprises an anionic polyelectrolyte and the electrode; the cross section of the moisture power generation fiber is a special-shaped cross section. According to the scheme, high-power output of the fiber-based moisture power generation material can be realized through dynamic regulation and control of fiber components and morphological structures in different areas.