7742 results about "Polyacrylamide" patented technology

The present invention comprises methods and compositions for antimicrobial silver compositions comprising silver nanoparticles. The present invention further comprises compositions for preparing silver nanoparticles comprising at least one stabilizing agent, one or more silver compounds, at least one reducing agent and a solvent. In one aspect, the stabilizing agent comprises a surfactant or a polymer. The polymer may comprise polymers such as polyacrylamides, polyurethanes, and polyamides. In one aspect, the silver compound comprises a salt comprising a silver cation and an anion. The anion may comprise saccharinate derivatives, long chain fatty acids, and alkyl dicarboxylates. The methods of the present invention comprise treating devices with the silver nanoparticle compositions, including, but not limited to, such devices as woven wound care materials, catheters, patient care devices, and collagen matrices. The present invention further comprises treatment of humans and animals wacr6ith the antimicrobial devices described herein.

The present invention employs hydrogels as acoustic couplings for clinical applications of ultrasound imaging and therapy, but is particularly applicable to high intensity focused ultrasound (HIFU) based therapy. While other materials can be used, it has been determined that polyacrylamide is sufficiently robust and transmissive to withstand the high temperatures encountered in HIFU therapy. One embodiment of a hydrogel coupling is configured in shape and size (length) to ensure that a focal region of an ultrasound transducer is disposed proximate the target area when the distal tip of the transducer is in contact with tissue. These couplings can be shaped to correspond to the beam focus characteristics of specific transducers. Water can be applied to hydrate the tip of the hydrogel coupling during use, and medication absorbed into the hydrogel material can be applied to the tissue in contact with the distal surface of the hydrogel.

The invention discloses an attapulgite argil powder with an air purifying function. The technical scheme is as follows: the attapulgite argil powder with an air purifying function is prepared from high-viscosity attapulgite clay, an attapulgite constant-humidity conditioner, a natural mineral adsorbing/filtering agent, Cacumen Biotae, aluminum silicate fiber and polyacrylamide. The attapulgite argil powder is prepared by the following steps: pulverizing the materials, soaking and aging to obtain a wet mixture, extruding the wet mixture into a strip, airing the strip, pulverizing to obtain powder, and packaging to obtain the finished product. The attapulgite argil powder has favorable cohesive property, plasticity, thixotropy, fire resistance and thermal stability; the pottery prepared from the attapulgite argil powder with an air purifying function contains a great deal of micropores and activated carbon, thus, has the characteristics of low shrinkage, no cracking or deformation and favorable adsorbability, and can effectively adsorb formaldehyde, ammonia, benzene and other harmful substances in the air, thereby protecting the environment and improving good health of people. The invention is suitable for producing pottery artware with an air purifying function.

Methods and compositions generating and using an interleukin-1 receptor antagonist (IL-1ra)-rich solution. Methods for generating and isolating interleukin-1 receptor antagonist include incubating adipose tissue and/or adipocytes with polyacrylamide beads to produce interleukin-1 receptor antagonist. The interleukin-1 receptor antagonist is isolated from the polyacrylamide beads to obtain the solution rich in interleukin-1 receptor antagonist. Methods for treating a site of inflammation in a patient include administering to the site of inflammation the solution rich in interleukin-1 receptor antagonist.

The invention discloses a profile control oil-displacement agent for a core-shell type inorganic/organic polymer composite microballoon. A preparation method of the core-shell type inorganic/organic polymer composite microballoon comprises the following steps of carrying out surface modification of inorganic cores of inorganic nano-particles such as silica particles and magnetic particles, and carrying out graft polymerisation by a dispersion polymerization method or an inverse emulsion polymerization method to form polymer shells (such as polyacrylamide cross-linked copolymers) on the surfaces of the inorganic cores. The inorganic components and the organic components bind by chemical bonds so that the core-shell type inorganic/organic polymer composite microballoon has very stale structure. The core-shell type inorganic/organic polymer composite microballoon retains the advantages of polymer microballoons and inorganic particles, and has strong heat-resistant and mineralization-resistant capabilities, high plugging strength and good dilatancy. The core-shell type inorganic/organic polymer composite microballoon can move in rock pores and can plug the rock pores. When a plugging pressure difference is improved to a certain degree, elastic deformation of the core-shell type inorganic/organic polymer composite microballoon can be produced and the deformed core-shell type inorganic/organic polymer composite microballoon sequentially moves to a deep rock stratum part so that a liquid flow direction is changed gradually and a crude oil yield is improved. The profile control oil-displacement agent provided by the invention has a large potential.

Compositions comprising a blend of two or more paper strengthening agents have improved stability compared with previously known paper strengthening agents. One component is a polymeric paper strengthening agent, preferably a wet strengthening agent. The other component is a stabilized polyacrylamide prepared by (1) reacting a first portion of glyoxal with a polyacrylamide having pendant amide groups to form a first reaction mixture comprising polyacrylamide; (2) adding an acid to the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the polyacrylamide; and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized polyacrylamide. If desired, an aldehyde scavenger can be included in one or more of step (1), step (2), step (3), or the stabilized polyacrylamide. Such compositions can be used to enhance the strength of paper, particularly the wet strength of paper.

The invention features a composition comprising a self-healing interpenetrating network hydrogel comprising a first network and a second network. The first network comprises covalent crosslinks and the second network comprises ionic or physical crosslinks. For example, the first network comprises a polyacrylamide polymer and second network comprises an alginate polymer.

The invention relates to an optionally foamed sealing composition for preformed seals which can swell when treated with water. The invention also relates to a method for the production thereof out of natural rubber and/or elastomers with a matrix comprised of natural rubber/elastomer components and particle-shaped water absorbing material stored therein. The water absorbing material is a combination of (A) polysaccharide(s) selected from cellulose, starch, starch derivatives removed from grafted starch, amylose, amylopectin, dextran, pectin, inulin, chitin, xanthan, alginic acid, alginates, carrageenan, pustulan, callose, laminarin, guluronic acid, pullulan, lichenin or mixtures of the same with (B) a highly water absorbent synthetic polymer selected from polymers based on (meth)acrylate, poly(meth)acrylic acid and the salts thereof, polyacrylamide, polyalcohols or copolymers of said synthetic polymers. The invention also relates to additional cross-linking and processing auxiliary agents and to property improving agents. It is possible to securely seal superstructures, substructures, tunnels and canals with the assistance of the inventive sealing compositions.

The invention relates to a high-temperature resistant phenolic resin weak gel profile control plugging agent, which is a profile control plugging agent formed by reacting partially-hydrolyzed polyacrylamide and a cross-linking agent by acylamino of the hydrolytic polyacrylamide. The profile control plugging agent comprises the following components in percentage by weight: 0.25 to 1.2 percent of partially-hydrolyzed polyacrylamide, 0.2 to 1 percent of cross-linking agent, 0.01 to 1 percent of additive and the balance of water. According to the high-temperature resistant phenolic resin weak gel profile control plugging agent, the water plugging rate is more than 80 percent, the oil plugging rate is less than 30 percent, the profile control plugging agent can be resistant to high temperature of over 90 DEG C, mineralization resistance is up to 85,000 mg/L (on the basis of 80,000 mg/L of sodium chloride and 5,000 mg/L of calcium chloride), the strength of gel is high, breaking strength is improved by 68 percent compared with the prior art, the gel-formation time is adjustable, the aims of plugging high-permeability layers in strata and adjusting water absorption profiles of water injection wells deeply can be fulfilled, the deep profile control of oil layers is realized, and the recovery ratio of petroleum is improved greatly.

The invention discloses a sodium alginate-acrylamide composite aquagel. The preparation method comprises the following steps: 1) proportionally dissolving sodium alginate and acrylamide in water, and uniformly mixing; 2) sequentially adding a crosslinking agent and an initiator, carrying out vacuum degassing treatment, and adding a catalyst; and 3) transferring the obtained mixed solution into a glass mold, and heating to react, thereby obtaining the sodium alginate-acrylamide composite aquagel. The sodium alginate-acrylamide composite aquagel has favorable multivalent ion adsorption capacity and biocompatibility. By combining the polyacrylamide network with the graft copolymerization action of the sodium alginate and acrylamide, the mechanical properties of the aquagel are effectively enhanced. The aquagel is sensitive under the condition of different pH values, can generate intermolecular interactions with multiple cationic dyes and heavy metal ions, and is applicable to the fields of chemical substance adsorptive separation, sewage treatment and the like.

The invention relates to a harsh oil deposit reversed-phase microemulsion profile-control flooding system and a preparation method thereof. The problems in the prior art that the initial particle size of the product is improper and polymeric microspheres are poor in expansibility under high-temperature high-salt conditions are mainly solved. The harsh oil deposit reversed-phase microemulsion profile-control flooding system disclosed by the invention comprises the following components in parts by weight of microemulsion: 20-70 parts of an oil-soluble solvent, 5-20 parts of an emulsifier and a co-emulsifier, 20-70 parts of a polymer aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers. According to the technical scheme, a semi-continuous reaction method is adopted, the aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers is added into an oil phase containing the emulsifiers in batches, and a hydrophobic monomer is added, so that the problems are solved, the prepared polyacrylamide reversed-phase microemulsion is directly compounded or is compounded with other oil field chemicals to be applied to such field applications for improving oil recovery as depth profile control, water plugging and displacement in tertiary oil recovery of a harsh oil deposit.

The invention belongs to the technical field of river water body pollution control and in particular relates to a multiple-element compound flocculating settling agent and the application of the multiple-element compounded flocculating settling agent in arsenic pollution water body treatment. The multiple-element compounded flocculating settling agent is prepared by compounding malysite, aluminium salt, hypermanganate, polyacrylamide and aqueous solution. The multiple-element compounded flocculating settling agent can be applied in the arsenic pollution water body treatment to remove arsenic in the arsenic pollutant water body. The concentration of the arsenic in the treated water can meet or is superior to the specified requirement of three types of water on the arsenic concentration in the national earth surface water environment quality standard (less than 0.05 mg/L). The invention also can be used for removing heavy metals such as copper, chromium, cadmium, lead and the like in water by sedimentation. The multiple-element compounded flocculating settling agent can be used together with a multiple-element compounded metal oxide arsenic removal setting agent in static or flowing arsenic pollution water body treatment for removing the arsenic in the water body polluted by arsenic.

A thermocured, heat conductive and heat radiating paint for an LED lamp is prepared by the following raw materials by weight: 40-45 parts of polyacrylic resin, 5-8 parts of polyurethane resin, 4-6 parts of polyacrylamide, 6-8 parts of isophorone diamine IPDA, 20-24 parts of xylene, 2-3 parts of silane coupling agent KH550, 1-2 parts of aluminium powder, 8-12 parts of ethyl acetate, 2-4 parts of benzyltrimethylammonium tribromide, 10-12 parts of aluminium nitride, 2-3 parts of beryllia, and 4-5 parts of film forming auxiliary agent. Aluminium nitride powder, the beryllia and the aluminium powder are added, so as that the paint has high heat conduction rate and good heat radiation effect, and can be long-term used under 200 DEG C without change of mechanical property; polyacrylic resin is used, so as that the paint has advantages of excellent fullness, glossiness, hardness, solvent resistance and weatherability, without color change and brightness reversion when high temperature baked; and the paint has advantages of large adhesion stress, not-easy shedding, aging resistance and long usage life.

The invention relates to high-efficiency hydrate inhibitive environment-friendly drilling fluid, and particularly relates to the drilling fluid containing water, bentonite, hyamine dimeric surfactant, inorganic salt, sodium carboxymethyl starch, cationic polyacrylamide and solid anti-sloughing lubricating agent GFRH. The high-efficiency hydrate inhibitive environment-friendly drilling fluid can be used for exploiting continental or ocean oil-gas resources and can effectively inhibit the generation of hydrate; moreover, the components of the drilling fluid are small in environment harm, and the drilling fluid has the advantages of high efficiency and environmental protection.

The invention relates to a kind of pair-slurry affusing material prepared with cement as basic raw material. It is comprised of two kinds of dry powdery mixed materials A and B of affusing slurry pair-liquid formed after adding water. Their weight percents are respectively: mixed material A: sulfur aluminate cement 30% - 98.1%, retarder citric acid 0.1% - 0.5%, flocculant polyacrylamide 0% - 0.8%, water-reducing agent FDN 0.6% - 1.5% and inorganic padding pulverized coal ash 0% - 69.1%; mixed material B: Portland cement 20% - 88%, land plaster 6% - 15%, flocculant UWN 0% - 0.7%, accelerator lithium carbonate 0.4% - 1.0%, water-reducing agent FDN 0.5% - 1.3%, calcareousness 2.0% - 5.0% and inorganic padding pulverized coal ash 0% - 70.8%.

A method for making a storage-stable glyoxalated polyacrylamide composition suitable for use as a strengthening agent for paper in which the glyoxal is added to the base polyacrylamide polymer in two portions and a scavenger for aldehyde groups is used.

Compositions comprising a blend of two or more paper strengthening agents have improved stability compared with previously known paper strengthening agents. One component is a polymeric paper strengthening agent, preferably a wet strengthening agent. The other component is a stabilized glyoxalated polyacrylamide prepared by (1) reacting a first portion of glyoxal with a polyacrylamide having pendant amide groups to form a first reaction mixture comprising glyoxalated polyacrylamide; (2) adding an acid to the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the glyoxalated polyacrylamide; and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized glyoxalated polyacrylamide. If desired, an aldehyde scavenger can be included in one or more of step (1), step (2), step (3), or the stabilized glyoxalated polyacrylamide. Such compositions can be used to enhance the strength of paper, particularly the wet strength of paper.

The present invention relates to a hydrophobically-associating polyacrylamide fracturing fluid thickener, a preparation method and applications thereof. In the prior art, the polyacrylamide polymer fracturing fluid thickener has disadvantages of insufficient temperature resistance, incomplete gel breaking and instability at high temperature and high shearing. A purpose of the present invention is mainly to solve the problems in the prior art. The hydrophobically-associating polyacrylamide fracturing fluid thickener is prepared by carrying out a reaction on a reaction system comprising components of 15-50 parts by weight of acrylamide, 1-50 parts by weight of a cationic monomer or anionic monomer, 1-20 parts by weight of a nonionic monomer, 0.01-0.5 part by weight of a hydrophobic monomer, 0.001-0.005 part by weight of a molecular weight regulator, 0.0001-0.0005 part by weight of a composite initiator, and 30-80 parts by weight of water. With the technical scheme, the problems in the prior art are well solved. According to the present invention, the hydrophobically-associating polyacrylamide fracturing fluid thickener can be separately applied in the oil and gas field fracturing process, or can be compounded with other auxiliary agents so as to be adopted as the fracturing fluid thickener applied in the oil and gas field fracturing process.

The invention discloses a plugging flexibilizer, comprising the components in parts by weight: 5-12 parts of polypropylene fiber, 20-30 parts of rubber particles, 1-5 parts of high molecular polyacrylamide, 2-8 parts of toughened nylon, 2-8 parts of asbestos section, 5-12 parts of plant fibers, 4-7 parts of calcium hydroxide, and 0.1-0.4 part of polyanionic cellulose PAC-HV. A preparation method of the plugging flexibilizer comprises the following steps: orderly adding the components in parts by weight to a kneading machine according to a conventional preparation method at constant temperature and constant pressure; evenly mixing and stirring; and crushing into a 0.05-1mm granular product. The plugging flexibilizer has the characteristics of being wide in material source, free of toxicity and pollution, simple and convenient in construction technology, good in rheological property, good in pillar-forming property, strong in tenacity, not easy to fragilely fall off, high in plugging success rate and the like, does not easily generate a rupture and a brittle fracture in the drilling process after plugging, and is widely applied to pressure-loaded plugging engineering of low-pressure fractured formation, large cracks, large caves, subterranean rivers and serious voidage formation in petroleum and geological drilling.

The present invention includes a process and composition for treating skin disorders. The composition of the present invention comprises 94.0 to 99.2 percent by weight of cation-free water, 0.1 to 1.0 percent by weight of Calcium chloride, 0.0 to 2.0 percent by weight of linear long chain polyphosphate, 0.1 to 1.0 percent by weight of sodium bicarbonate and 0.5 to 3.0 percent by weight of cross-linked polyacrylamide polymer.

The invention discloses a protein-based wood adhesive which is characterized by being made of the following raw materials in part by weight: 100 parts of water, 5 to 50 parts of protein-containing raw materials, 10 to 14 parts of polyamide epichiorobydrin (PAE), 5 to 15 parts of modifier, 1 to 15 parts of acidity regulator, 0 to 15 parts of stabilizer, 0 to 10 parts of humectant, 0 to 10 parts of anti-freeze, 0.1 to 10 parts of preservatives, 0 to 10 parts of mold inhibitor, 0 to 10 parts of enzyme inhibitor, and 0 to 10 parts of filling. The protein-containing raw materials contain over 10% of coarse protein, and the modifier is one of or a mixture of several of polyacrylamide, polyvinyl alcohol, polyvinyl acetate, borax, ammonium thiosulfate, carbamide and isocyanate. The invention also discloses a preparation method of the protein-based wood adhesive. The invention adopts common chemical materials and adopts a break-through normal-temperature material-mixing technique, which uses water as solvent. The adhesive has the advantages of high stickiness, evenness and convenience in adhesive application and stable product quality.

Buffer compositions comprising semiconductive oxide particles and at least one of (a) a fluorinated acid polymer and (b) a semiconductive polymer doped with a fluorinated acid polymer are provided. Semiconductive oxide particles include metal oxides and bimetallic oxides. Acid polymers are derived from monomers or comonomers of polyolefins, polyacrylates, polymethacrylates, polyimides, polyamides, polyaramids, polyacrylamides, polystyrenes. The polymer backbone, side chains, pendant groups or combinations thereof may be fluorinated or highly fluorinated. Semiconductive polymers include polymers or copolymers derived from thiophenes, pyrroles, anilines, and polycyclic heteroaromatics. Methods for preparing buffer compositions are also provided.

The invention discloses a method for preparing an organic fertilizer by fermenting cow dung compost. According to the method, two times of composting fermentation are adopted and a composting promoter is added, so that the fermentation speed and the composting degree can be quickly increased; meanwhile, polyacrylamide, bentonite, cocoanut active charcoal and the like are added to reduce the moisture in cow dung and achieve the effect of deodorizing; sodium bicarbonate and triple superphosphate are added to generate carbon dioxide which can expand the cow dung, so that the permeability is increased; the early-stage fermentation temperature of the cow dung can be increased by the heat released from reaction, so that the activity of natural fermentation bacteria agents in the cow dung is improved; meanwhile, when the heat generated by the cow dung after a period time of composting is overhigh, the polyacrylamide absorbs the moisture in the cow dung to achieve the effect of reducing the temperature and to reduce turning times; after the fermentation is completed, the organic fertilizer prepared by drying and dewatering is high in fertilizer efficiency, durable and efficient, has the effects of retaining water, sterilizing and improving soil, and can promote the rapid growth of crops, thus improving the yield and the quality of the crops.

Compositions and methods are provided for performing capillary electrophoresis using a composition comprising in combination in an aqueous buffered medium a coating polymer and a sieving polymer, where the sieving polymer is more hydrophilic than the coating polymer and is present in greater amount. Of particular interest are uncrosslinked acrylamide polymer mixtures for coating plastic channels and providing sieving for performing DNA separations in microfluidic devices. Polyacrylamide or N,N-dimethyl acrylamide is used with a N,N-dialkyl acrylamide copolymer, either separately or together for sieving and coating, serving as the medium in capillary electrophoresis DNA separations.

Disclosed is an elastomeric article, such as a glove, and a process for making the elastomeric articles. The elastomeric articles include a primary matrix including one or more layers of elastomeric polymer, such as a natural or synthetic latex or a block copolymer, and a polymeric coating on a surface of the primary matrix. The polymeric coating is formed of crosslinked polymers which are crosslinked with a cationic crosslinking agent such as a polyamide epichlorohydrin crosslinking agent. The polymeric coating can be a crosslinked polyarcylate, polyacrylamide, or polysaccharise, for example. In one embodiment, the crosslinking agent crosslinks the polymeric coating to the primary matrix layer of the article, forming secure attachments between the primary matrix and the polymeric coating. In one embodiment, the crosslinking agent may crosslink the elastomeric polymer as well as the polymeric coating. In one embodiment, the polymeric coating is a donning coat on a glove and may include a suitable lubricant applied to the surface of the donning coat.

Methods and treatments for osteolysis employing interleukin-1 receptor antagonist (IL-1ra). Activating production of interleukin-1 receptor antagonist includes incubating adipose tissue, adipocytes, whole blood, platelet rich plasma, and/or isolated white blood cells with polyacrylamide beads to produce a solution rich in interleukin-1 receptor antagonist. Activating the production of interleukin-1 receptor antagonist includes using an implantable device loaded with adipose tissue, adipocytes, whole blood, platelet rich plasma, and/or isolated white blood cells. Methods for treating osteolysis at the site of an artificial joint in a patient include administering and/or inserting the solution rich in interleukin-1 receptor antagonist and/or the implantable device, respectively.

The invention relates to a preparation method of inverse opal hydrogel photonic crystal with double layer hybridized structure. The preparation method has the advantages that: the raw materials are polyacrylic acid and polyacrylamide which are available, and the preparation method includes two filling gather steps and is simple and practicable; and the polyacrylic acid and polyacrylamide respectively contains carboxyl and amide functional group, thus simultaneously realizing pH and solvent sense response, and the polyacrylamide can be used as internal parameter reference to monitor pH responsecondition when not responding to pH in solution with pH value less than 8.

The invention relates to a sulphonated heat resistant and salt tolerant copolymer for an oil field and a preparation method thereof, which are mainly used for solving the problems that polyacrylamide has poor heat resistance and salt tolerance under the conditions of high temperature and high salinity, more monomers are introduced by copolymers and the content of the copolymers is high in the prior art. The problems are better solved through the technical scheme in which the sulphonated heat resistant and salt tolerant copolymer for the oil field and the preparation method thereof are provided, wherein the sulphonated heat resistant and salt tolerant copolymer for the oil field is obtained through the steps of introducing monomers with sulfonic groups on larger lateral groups to copolymerize with polyacrylamide, and then hydrolyzing. The sulphonated heat resistant and salt tolerant copolymer for the oil field, provided by the invention, can be used as an oil displacement agent for oilextraction in the oil field and can also be used in the oil field application field such as fracturing fluid thickening agent, water plugging/profile modifying agent, drilling fluid additive and the like. The preparation method provided by the invention is simple in process and easy for industrial production.

An endoprosthesis comprised of a resorbable outer shell or coating material housing a filling material provides practical and cosmetic advantages. The outer shell or coating is resorbed back into the body within 12 months of implantation. Materials such as polyurethane, at an appropriate thickness, serve as an outer shell and provide the endoprosthesis with a shape as well as rendering the endoprosthesis implantable and easily handled by the surgeon. Once implanted, the outer shell or coated is resorbed into the body. The filling material, on the other hand, is biostable and biocompatible. The filling material is in the form of a hydrogel with a viscosity suited for the purpose. Polyacrylamide is a well suited hydrogel since it is biocompatible and can be formulated to the appropriate viscosity. The endoprosthesis of the invention can be used for soft-tissue replenishment such as in the face and breasts, or in the joints for support, or in an internal conduit to provide bulking.

The invention relates to a gel plugging agent for deep profile control of a higher temperature oil reservoir, and a preparation method of the gel plugging agent. The gel plugging agent comprises 0.3-0.8 percent of nonionic polyacrylamide, 0.6-1.3 percent of a cross-linking agent A, 0.45-1.44 percent of a cross-linking agent B, 0.02-0.04 percent of a temperature stabilizer and 0.01-0.08 percent of a pH value regulator, wherein the cross-linking agent A is methenamine; the cross-ling agent B is hydroquinone or resorcinol; the temperature stabilizer is sodium thiosulfate, sodium bisulfite or sodium sulfite; and the pH regulator is sodium hydroxide, potassium hydroxide, sodium carbonate or sodium bicarbonate. The gel plugging agent disclosed by the invention has strong temperature resisting performance and can be used for the profile control operation of the high temperature oil reservoir with 100-160DEG C; the gel plugging agent has the characteristics of high strength after being gelatinized, stronger plugging capability for the stratum and favorable thermal stability; and in addition, after the gel plugging agent is stood at the temperature of 130 DEG C for 90 days, the strength change is little and gel breaking and hydration are avoided.