37 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.

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.

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 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.

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.

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 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 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.

The invention belongs to the technical field of electrochemical catalysis, and discloses a preparation method of an industrial-grade current density carbon dioxide reduction catalyst layer for a pure acid membrane electrode system, and the preparation method comprises the following steps: dissolving a copper salt, a reducing agent and a surfactant in a reaction solvent, and preparing a copper ball template through cosolvothermal for a period of time; then silver salt and a reducing agent are added into the copper ball solution to react for a period of time, and then a dilute acid solution is added to etch copper to obtain multi-cavity structure silver; the cationic polyelectrolyte is coupled with the multi-cavity structure silver catalyst layer to serve as a cathode electrode, the cathode electric field effect is effectively shielded through the cationic polyelectrolyte, H < + > ions near reaction sites are repelled, the multi-cavity structure catalyst can reduce electrolyte flowing, the local pH value of the site surface layer is increased, and the reaction efficiency is improved. The hydrogen evolution reaction is inhibited to a great extent through the synergism of the two, and the electrochemical CO2 reduction activity of an acidic system is enhanced.

The invention provides silicon dioxide composite nanoparticles as well as a preparation method and application thereof. The silicon dioxide composite nanoparticles comprise cationic polyelectrolyte modified silicon dioxide nanoparticles as well as resveratrol and an ultraviolet absorbent which are sequentially loaded on the outer layer of the cationic polyelectrolyte modified silicon dioxide nanoparticles, the ultraviolet absorbent is prepared from any one or a combination of at least two of bis-ethyl hexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethyl butyl phenol, diethylamino hydroxybenzoyl hexyl benzoate or butyl methoxy dibenzoyl methane. The ultraviolet absorbent plays a role in sun protection externally and shields ultraviolet rays to improve the light stability of the resveratrol, the resveratrol plays a role in oxidation resistance internally and quenches free radicals to improve the light stability of the ultraviolet absorbent, and the ultraviolet absorbent and the resveratrol cooperate to achieve the dual functions of ultraviolet full-wave band efficient protection and free radical scavenging.

The invention provides conductive hydrogel as well as a preparation method and application thereof, and particularly relates to the technical field of biomedical materials. The preparation method of the conductive hydrogel specifically comprises the following steps: S1, respectively preparing a cationic polyelectrolyte solution containing a conductive medium, an anionic polyelectrolyte solution containing a conductive medium and a drug-loading solution, and respectively stirring by using magnetic force until the solution is completely dissolved and clarified; s2, substrate forming, layer-by-layer assembling, drug loading and outer layer packaging are carried out, and a multi-layer drug loading stent with outer layer packaging is obtained; and S3, carrying out physical hydration on the dried multi-layer drug-loaded stent with the outer layer encapsulation obtained in the step S2 to obtain the conductive hydrogel. The conductive hydrogel obtained by the invention has high drug loading rate and stability, excellent ionic conductivity, intrinsic antibacterial property and transdermal function promotion, effectively solves the problems of easy volatilization, uneven loading, single function and the like of a hydrophobic drug in a traditional physiotherapy electrode plate, and is especially suitable for preparing a transdermal drug delivery electrical stimulation physiotherapy electrode plate with high performance.

This invention discloses a method for preparing a photocatalytic antibacterial composite material; the method involves using Sn... 4+ / Ga ND reacts with an aqueous solution of sodium carboxymethyl cellulose (CMC) and undergoes hydrothermal sulfidation to induce the formation of tin vacancies. Single-atom Mo is then assembled at these tin vacancies using an impregnation method combined with heat treatment to obtain SAMo-SnS2 / Ga ND powder. Simultaneously, using natural corn stalk cellulose as a substrate, it is dissolved in the ionic liquid BmimCl. ATBPC monomers are grafted onto the cellulose molecular chain using RAFT controlled graft polymerization technology to prepare a cellulose-based cationic polyelectrolyte PATBPC-co-Cellulose solution. The PATBPC-co-Cellulose solution is then blended with the SAMo-SnS2 / Ga ND powder and regenerated with ether to form a composite antibacterial material. This composite material has shown high efficiency and long-lasting bactericidal activity in antibacterial experiments against multidrug-resistant Escherichia coli and methicillin-resistant Staphylococcus aureus under both light and dark conditions, demonstrating promising application prospects.

The invention relates to the technical field of biomedical materials and medical instruments, in particular to self-gelation absorbable styptic powder and a simple and efficient preparation method thereof, and the preparation method comprises the following steps: taking a cationic polyelectrolyte, an anionic polyelectrolyte and a hydration aid, grinding and mixing; wherein the cationic polyelectrolyte is selected from one or more of quaternized chitosan, chitosan and chitosan oligosaccharide, and the anionic polyelectrolyte is selected from one or more of sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, sodium alginate and carrageenan. According to the styptic powder, physical plugging of a bleeding part which cannot be pressed can be achieved, the problems that macromolecular styptic powder easily floats on the surface of blood and is easily dispersed by blood flow are solved, the styptic capacity is improved, the application scene of the styptic powder is expanded, and meanwhile formed gel can be degraded in vivo and does not need to be taken out. The styptic powder obtained by the method has the advantages of high water absorption rate, high strength after gelatinization, difficulty in collapsing, strong tissue adhesion and the like.

A composition for colouring fibres, the composition comprising an aqueous medium, pigment particles dispersed in the aqueous medium, and a cationic functionalisation agent at least electrostatically adsorbed to the surface of the dispersed pigment particles. The cationic functionalisation agent is selected from cationic polyelectrolytes and cationic 5 surfactants, and the ratio of the pigment to cationic functionalisation agent is greater than about 10:1. The composition does not comprise polyethylenimine.

The invention discloses a method for realizing normal-temperature dyeing and wastewater treatment by a one-bath one-step method, which comprises the following steps: (1) carrying out coating treatment on a cellulose textile by adopting a cationic polyelectrolyte solution, so that the cationic polyelectrolyte forms a plurality of adsorption layers on the surface of the textile to obtain a coated textile; the cationic polyelectrolyte solution comprises a polyhexamethylene guanidine salt and / or a poly (aminopropyl) biguanide salt; and (2) putting the coated textile into an anionic dye solution for normal-temperature dyeing, taking out the obtained dyed textile, standing the remaining dye solution, and separating to obtain a treated solution. According to the invention, simultaneous dyeing and wastewater treatment can be realized; in the process, no additive needs to be added, so that subsequent wastewater treatment is really not needed, the environmental and cost pressure caused by sewage discharge in the textile printing and dyeing industry is relieved, and environmental protection is facilitated.

A bicontinuous polyelectrolyte complex (PEC)-layered membrane for selective recovery of volatile fatty acids (VFAs), the bicontinuous PEC-layered membrane including: a membrane, and a PEC layer disposed on the membrane, the PEC layer including a hydrophobically modified cationic polyelectrolyte and an anionic polyelectrolyte, wherein the PEC layer includes a bicontinuous structure due to complexation-induced phase separation driven by hydrophobicity contrast between the hydrophobically modified cationic polyelectrolyte and the anionic polyelectrolyte.