polyacrylamide microsphere google patents

CN102532375A – Polyacrylamide microsphere – Google Patents

The invention discloses a polyacrylamide microsphere. For multiple chemical methods for preparing the polyacrylamide microsphere at present, the preparation processes use a great amount of emulsifying agents and organic solvents inevitably so as to cause increase of the production cost and simultaneously cause large pressure to the environment.,CN111205403B – Polyacrylamide microsphere for rapid … ,The invention discloses a polyacrylamide microsphere for quickly extracting nucleic acid, a preparation method and application thereof. The invention prepares the polyacrylamide microspheres with various sizes by two methods of sample application polymerization and improved reversed-phase microemulsion polymerization, has visible fluorescence and near infrared fluorescence, has stable shape …,CN106866880A – Polydispersion polyacrylamide microsphere … ,CN106866880A CN201510922491.XA CN201510922491A CN106866880A CN 106866880 A CN106866880 A CN 106866880A CN 201510922491 A CN201510922491 A CN 201510922491A CN 106866880 A CN1068668

CN103073679A – patents.google.com

The invention discloses a method for producing a polyacrylamide microsphere water shutoff agent. The method comprises the following steps: weighing raw materials of acrylamide, salt tolerance monomers, N and N-methylene-bis-acrylyl, span 80, potassium persulfate, hexamethylene and deionized water; stirring and mixing a dispersing agent and the hexamethylene in a polymerizable monomer; and …,US11161958B2 – patents.google.com ,Disclosed is a macroporous polymeric hydrogel microsphere that contains polyacrylamide and chitosan. The hydrogel microsphere, having a diameter of 50-250 μm and an average pore size of 1-60 nm, is capable of transporting biomolecules conjugated to it.,CN104448131A – patents.google.com ,The invention relates to a preparation method of a porous magnetic polyacrylamide (PAM) microsphere adsorbent. The method comprises the following steps: carrying out initiated polymerization on a PAM monomer synthesis liquid containing acrylamide, polymeric polylol, N,N-methylene bisacrylamide, an initiator and water in a form of a liquid drop, so as to obtain porous PAM microspheres; dipping …

CN1752119A – patents.google.com

A process for preparing the dispersed polyacrylamide microballs includes such steps as preparing the aqueous solution of alcohol, adding acrylamide, polyvinyl pyrrolidone and azodiiso butylnitrile, loading it in rotary evaporator, reacting at 65-80 deg.C 30-120 rpm for 4-8 hr, centrifugal treating, adding alcohol, and ultrasonic dispersing.,Method for preparing polyacrylamide nano microsphere … ,The prepared polyacrylamide nano microsphere system can be directly diluted by water to form polymer microsphere aqueous solution at required concentration and can be used alone or in combination with other oil-field chemicals in fields of profile control, water plugging, fuel scavenge and the like for improving recovery operation. Google Patents,Preparation and performance of fluorescent polyacrylamide … ,Polyacrylamide microspheres have been successfully used to reduce water production in reservoirs, but it is impossible to distinguish polyacrylamide microspheres from polyacrylamide that is used to enhance oil recovery and is already present in production fluids. In order to detect polyacrylamide microspheres in the reservoir produced fluid, fluorescent polyacrylamide microspheres P(AM-BA-AMCO …

US Patent for Macroporous chitosan-polyacrylamide hydrogel …

Disclosed is a macroporous polymeric hydrogel microsphere that contains polyacrylamide and chitosan. The hydrogel microsphere, having a diameter of 50-250 μm and an average pore size of 1-60 nm, is capable of transporting biomolecules conjugated to it.,Preparation of cationic polyacrylamide microsphere … ,Lin M Q, Dong Z X, Peng B, et al. Shape, size and plugging properties of crosslinked polyacrylamide microspheres.,Preparation and performance of fluorescent polyacrylamide … ,Polyacrylamide microspheres have been successfully used to reduce water production in reservoirs, but it is impossible to distinguish polyacrylamide microspheres from polyacrylamide that is used to enhance oil recovery and is already present in production fluids. In order to detect polyacrylamide microspheres in the reservoir produced fluid, fluorescent polyacrylamide microspheres P(AM-BA-AMCO …

Preparation of Uniform-Sized Polystyrene−Polyacrylamide …

In the case of the yield, Ma et al. [35] synthesizing polystyrene-polyacrylamide composite microspheres from water/oil/water emulsion and further suspension polymerization reported a maximum of 90 …,The Transport and Retention Behaviors of … – ResearchGate ,Request PDF | The Transport and Retention Behaviors of Deformable Polyacrylamide Microspheres in Convergent-Divergent Microchannels | Knowledge of the transport and retention behaviors of soft …,US Patent Application for THERMAL INSULATION COATING … ,The present invention relates to a thermal insulation coating comprising at least two layers of coating, wherein a composition of the first layer comprises a silicone-based binder and a hollow glass microsphere, a composition of the second layer comprises an acrylic polymer and a hollow glass microsphere. Said thermal insulation coating is suitable for high-temperature applications, capable of …

Synthesis and characterization of polyacrylamide‐grafted …

Microspheres of polyacrylamide-grafted-chitosan crosslinked with glutaraldehyde were prepared and used to encapsulate indomethacin, a nonsteroidal anti-inflammatory drug.,Hydrogels in the clinic – Mandal – 2020 – Bioengineering … ,Other common hydrogel materials, such as polyethylene glycol and polyacrylamide, are non-adhesive and must be modified chemically with adhesive ligands to facilitate cell infiltration. 49 However, for other applications discussed in this paper, such as marking tumor margins (e.g., TraceIT), rapid biodegradability is a design limitation, and …,Cross-linked starch microspheres: Effect of cross-linking … ,Cross-linked starch microspheres were prepared using different kinds of cross-linking agents. The influence of several parameters on morphology, size, swelling ratio and drug release rate from these microspheres were evaluated.

PLGA/PLA-Based Long-Acting Injectable Depot Microspheres …

2.1. PLGA/PLA Polymer. The selection of the PLGA/PLA polymer for the development of microspheres depends on the route of administration, which is specific for a particular drug, the amount of microspheres administered per unit dose, rate of drug release from the microspheres in a day to meet the therapeutic concentration of the specific drug, and the degradation time of the polymer.,The Transport and Retention Behaviors of … – ResearchGate ,Request PDF | The Transport and Retention Behaviors of Deformable Polyacrylamide Microspheres in Convergent-Divergent Microchannels | Knowledge of the transport and retention behaviors of soft …,US Patent for Hemostatic microspheres Patent (Patent … ,Provided herein are hemostatic compositions. In one embodiment, the hemostatic composition includes cross-linked polymer microspheres, such as cross-linked gelatin microspheres with pores.

Polyacrylamide-hydroxyapatite composite: Preparation …

@article{osti_22149819, title = {Polyacrylamide-hydroxyapatite composite: Preparation, characterization and adsorptive features for uranium and thorium}, author = {Baybas, Demet and Ulusoy, Ulvi}, abstractNote = {The composite of synthetically produced hydroxyapatite (HAP) and polyacrylamide was prepared (PAAm-HAP) and characterized by BET, FT-IR, TGA, XRD, SEM and PZC analysis.,Preparation of Uniform-Sized Polystyrene−Polyacrylamide … ,In the case of the yield, Ma et al. [35] synthesizing polystyrene-polyacrylamide composite microspheres from water/oil/water emulsion and further suspension polymerization reported a maximum of 90 …,Formulation and characterisation of zein microspheres as … ,We report on the formulation of non-porous, spherical microspheres composed of zein (a protein from corn) for drug/vaccine delivery. Microspheres were prepared by a simple coacervation technique and a 3 3 factorial design was used to understand the effects of experimental variables on the particles formed.

US Patent for FCC catalyst having alumina derived from …

A zeolite fluid catalytic cracking catalyst is provided that passivates nickel and vanadium during catalytic cracking. The zeolite fluid catalytic cracking catalyst includes Y-faujasite crystallized in-situ from a metakaolin-containing calcined microsphere.,Cross-linked starch microspheres: Effect of cross-linking … ,Cross-linked starch microspheres were prepared using different kinds of cross-linking agents. The influence of several parameters on morphology, size, swelling ratio and drug release rate from these microspheres were evaluated.,Investigation on the Adaptability of the Polymer … ,A kind of silica-reinforced polymer microspheres was proposed and prepared by inverse suspension polymerization, in which the nano-silica modified by 3-(methacrylyloxy) propyl trimethoxysilane …

CN102532375B – Polyacrylamide microsphere – Google Patents

The invention discloses a polyacrylamide microsphere. For multiple chemical methods for preparing the polyacrylamide microsphere at present, the preparation processes use a great amount of emulsifying agents and organic solvents inevitably so as to cause increase of the production cost and simultaneously cause large pressure to the environment.,CN111205403B – Polyacrylamide microsphere for rapid … ,The invention discloses a polyacrylamide microsphere for quickly extracting nucleic acid, a preparation method and application thereof. The invention prepares the polyacrylamide microspheres with various sizes by two methods of sample application polymerization and improved reversed-phase microemulsion polymerization, has visible fluorescence and near infrared fluorescence, has stable shape …,CN108314758B – Polyacrylamide microsphere emulsion and … ,The invention relates to a submicron polyacrylamide microsphere emulsion with high solid content and good stability and a preparation method thereof, and mainly solves the problems that the dosage of an emulsifier for preparing a polyacrylamide microsphere emulsion by using a reverse microemulsion method is high, the solid content of a product prepared by using a common reverse emulsion method …

CN110317289B – Polyacrylamide nano-microsphere profile …

The invention discloses a polyacrylamide nano microsphere profile control agent for oil field chemical oil extraction, which belongs to the field of oil field chemistry and comprises the following raw materials: the catalyst comprises a coagent, a reaction monomer, an oil phase medium, a cross-linking agent, an initiator, an auxiliary initiator and water.,CN106866880A – Polydispersion polyacrylamide microsphere … ,CN106866880A CN201510922491.XA CN201510922491A CN106866880A CN 106866880 A CN106866880 A CN 106866880A CN 201510922491 A CN201510922491 A CN 201510922491A CN 106866880 A CN1068668,CN103739778A – Core-shell polyacrylamide microsphere … ,The invention discloses a core-shell polyacrylamide microsphere profile controlling oil displacement agent and a preparation method thereof. The method comprises the following steps: fully stirring and dissolving acrylamide, cationic monomer, a crosslinking agent and an initiator to synthetize a core part by adopting a dispersion polymerization method; fractionally adding a mixed solution of …

CN103073679A – patents.google.com

The invention discloses a method for producing a polyacrylamide microsphere water shutoff agent. The method comprises the following steps: weighing raw materials of acrylamide, salt tolerance monomers, N and N-methylene-bis-acrylyl, span 80, potassium persulfate, hexamethylene and deionized water; stirring and mixing a dispersing agent and the hexamethylene in a polymerizable monomer; and …,CN104448131A – patents.google.com ,The invention relates to a preparation method of a porous magnetic polyacrylamide (PAM) microsphere adsorbent. The method comprises the following steps: carrying out initiated polymerization on a PAM monomer synthesis liquid containing acrylamide, polymeric polylol, N,N-methylene bisacrylamide, an initiator and water in a form of a liquid drop, so as to obtain porous PAM microspheres; dipping …,CN103739778B – patents.google.com ,The invention discloses a kind of nucleocapsid structure polyacrylamide microsphere profile control reservoir oil displacing agent and preparation method; By abundant to acrylamide, cationic monomer, linking agent and initiator stirring and dissolving, adopt dispersion copolymerization method synthesis kernel portion; Then, the mixing solutions gradation of acrylamide, anionic monomer, Third …

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